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IP subnet calculator

Type an address with its prefix or mask to see the network, its usable range and masks. Split it into smaller subnets, or look up any prefix in the reference tables.

Network32.167.232.0/22
Usable hosts1,022
Subnet mask255.255.252.0
Addresses1,024
Network address
32.167.232.0
Broadcast address
32.167.235.255
First usable
32.167.232.1
Last usable
32.167.235.254
Usable hosts
1,022 (1,024 less the network and broadcast addresses)
Subnet mask
255.255.252.0
Wildcard mask
0.0.3.255 (Cisco ACLs, OSPF)
Prefix length
/22
Type
Public public
Old class
A (default /8)
As numbers
Hex 20A7E800 · Integer 547874816 to 547875839
Reverse DNS zones
232.167.32.in-addr.arpa
233.167.32.in-addr.arpa
234.167.32.in-addr.arpa
235.167.32.in-addr.arpa
/22 is not on a 8-bit boundary, so it takes 4 /24 zones.
Binary
Binary view
Binary (network bits bold, host bits grey)Dotted
Address00100000.10100111.11101000.0000000032.167.232.0
Subnet mask11111111.11111111.11111100.00000000255.255.252.0
Network00100000.10100111.11101000.0000000032.167.232.0
Broadcast00100000.10100111.11101011.1111111132.167.235.255
Split into smaller subnets/30
/23 (2)/24 (4)/25 (8)/26 (16)/27 (32)/28 (64)/29 (128)/30 (256)/31 (512)/32 (1,024)

32.167.232.0/22 makes 256 subnets of /30.

Subnets
#SubnetUsable hosts rangeBroadcastHosts
132.167.232.0/3032.167.232.1 to 32.167.232.232.167.232.32
232.167.232.4/3032.167.232.5 to 32.167.232.632.167.232.72
332.167.232.8/3032.167.232.9 to 32.167.232.1032.167.232.112
432.167.232.12/3032.167.232.13 to 32.167.232.1432.167.232.152
532.167.232.16/3032.167.232.17 to 32.167.232.1832.167.232.192
632.167.232.20/3032.167.232.21 to 32.167.232.2232.167.232.232
732.167.232.24/3032.167.232.25 to 32.167.232.2632.167.232.272
832.167.232.28/3032.167.232.29 to 32.167.232.3032.167.232.312
932.167.232.32/3032.167.232.33 to 32.167.232.3432.167.232.352
1032.167.232.36/3032.167.232.37 to 32.167.232.3832.167.232.392
1132.167.232.40/3032.167.232.41 to 32.167.232.4232.167.232.432
1232.167.232.44/3032.167.232.45 to 32.167.232.4632.167.232.472
1332.167.232.48/3032.167.232.49 to 32.167.232.5032.167.232.512
1432.167.232.52/3032.167.232.53 to 32.167.232.5432.167.232.552
1532.167.232.56/3032.167.232.57 to 32.167.232.5832.167.232.592
1632.167.232.60/3032.167.232.61 to 32.167.232.6232.167.232.632
1732.167.232.64/3032.167.232.65 to 32.167.232.6632.167.232.672
1832.167.232.68/3032.167.232.69 to 32.167.232.7032.167.232.712
1932.167.232.72/3032.167.232.73 to 32.167.232.7432.167.232.752
2032.167.232.76/3032.167.232.77 to 32.167.232.7832.167.232.792
2132.167.232.80/3032.167.232.81 to 32.167.232.8232.167.232.832
2232.167.232.84/3032.167.232.85 to 32.167.232.8632.167.232.872
2332.167.232.88/3032.167.232.89 to 32.167.232.9032.167.232.912
2432.167.232.92/3032.167.232.93 to 32.167.232.9432.167.232.952
2532.167.232.96/3032.167.232.97 to 32.167.232.9832.167.232.992
2632.167.232.100/3032.167.232.101 to 32.167.232.10232.167.232.1032
2732.167.232.104/3032.167.232.105 to 32.167.232.10632.167.232.1072
2832.167.232.108/3032.167.232.109 to 32.167.232.11032.167.232.1112
2932.167.232.112/3032.167.232.113 to 32.167.232.11432.167.232.1152
3032.167.232.116/3032.167.232.117 to 32.167.232.11832.167.232.1192
3132.167.232.120/3032.167.232.121 to 32.167.232.12232.167.232.1232
3232.167.232.124/3032.167.232.125 to 32.167.232.12632.167.232.1272
3332.167.232.128/3032.167.232.129 to 32.167.232.13032.167.232.1312
3432.167.232.132/3032.167.232.133 to 32.167.232.13432.167.232.1352
3532.167.232.136/3032.167.232.137 to 32.167.232.13832.167.232.1392
3632.167.232.140/3032.167.232.141 to 32.167.232.14232.167.232.1432
3732.167.232.144/3032.167.232.145 to 32.167.232.14632.167.232.1472
3832.167.232.148/3032.167.232.149 to 32.167.232.15032.167.232.1512
3932.167.232.152/3032.167.232.153 to 32.167.232.15432.167.232.1552
4032.167.232.156/3032.167.232.157 to 32.167.232.15832.167.232.1592
4132.167.232.160/3032.167.232.161 to 32.167.232.16232.167.232.1632
4232.167.232.164/3032.167.232.165 to 32.167.232.16632.167.232.1672
4332.167.232.168/3032.167.232.169 to 32.167.232.17032.167.232.1712
4432.167.232.172/3032.167.232.173 to 32.167.232.17432.167.232.1752
4532.167.232.176/3032.167.232.177 to 32.167.232.17832.167.232.1792
4632.167.232.180/3032.167.232.181 to 32.167.232.18232.167.232.1832
4732.167.232.184/3032.167.232.185 to 32.167.232.18632.167.232.1872
4832.167.232.188/3032.167.232.189 to 32.167.232.19032.167.232.1912
4932.167.232.192/3032.167.232.193 to 32.167.232.19432.167.232.1952
5032.167.232.196/3032.167.232.197 to 32.167.232.19832.167.232.1992
5132.167.232.200/3032.167.232.201 to 32.167.232.20232.167.232.2032
5232.167.232.204/3032.167.232.205 to 32.167.232.20632.167.232.2072
5332.167.232.208/3032.167.232.209 to 32.167.232.21032.167.232.2112
5432.167.232.212/3032.167.232.213 to 32.167.232.21432.167.232.2152
5532.167.232.216/3032.167.232.217 to 32.167.232.21832.167.232.2192
5632.167.232.220/3032.167.232.221 to 32.167.232.22232.167.232.2232
5732.167.232.224/3032.167.232.225 to 32.167.232.22632.167.232.2272
5832.167.232.228/3032.167.232.229 to 32.167.232.23032.167.232.2312
5932.167.232.232/3032.167.232.233 to 32.167.232.23432.167.232.2352
6032.167.232.236/3032.167.232.237 to 32.167.232.23832.167.232.2392
6132.167.232.240/3032.167.232.241 to 32.167.232.24232.167.232.2432
6232.167.232.244/3032.167.232.245 to 32.167.232.24632.167.232.2472
6332.167.232.248/3032.167.232.249 to 32.167.232.25032.167.232.2512
6432.167.232.252/3032.167.232.253 to 32.167.232.25432.167.232.2552
6532.167.233.0/3032.167.233.1 to 32.167.233.232.167.233.32
6632.167.233.4/3032.167.233.5 to 32.167.233.632.167.233.72
6732.167.233.8/3032.167.233.9 to 32.167.233.1032.167.233.112
6832.167.233.12/3032.167.233.13 to 32.167.233.1432.167.233.152
6932.167.233.16/3032.167.233.17 to 32.167.233.1832.167.233.192
7032.167.233.20/3032.167.233.21 to 32.167.233.2232.167.233.232
7132.167.233.24/3032.167.233.25 to 32.167.233.2632.167.233.272
7232.167.233.28/3032.167.233.29 to 32.167.233.3032.167.233.312
7332.167.233.32/3032.167.233.33 to 32.167.233.3432.167.233.352
7432.167.233.36/3032.167.233.37 to 32.167.233.3832.167.233.392
7532.167.233.40/3032.167.233.41 to 32.167.233.4232.167.233.432
7632.167.233.44/3032.167.233.45 to 32.167.233.4632.167.233.472
7732.167.233.48/3032.167.233.49 to 32.167.233.5032.167.233.512
7832.167.233.52/3032.167.233.53 to 32.167.233.5432.167.233.552
7932.167.233.56/3032.167.233.57 to 32.167.233.5832.167.233.592
8032.167.233.60/3032.167.233.61 to 32.167.233.6232.167.233.632
8132.167.233.64/3032.167.233.65 to 32.167.233.6632.167.233.672
8232.167.233.68/3032.167.233.69 to 32.167.233.7032.167.233.712
8332.167.233.72/3032.167.233.73 to 32.167.233.7432.167.233.752
8432.167.233.76/3032.167.233.77 to 32.167.233.7832.167.233.792
8532.167.233.80/3032.167.233.81 to 32.167.233.8232.167.233.832
8632.167.233.84/3032.167.233.85 to 32.167.233.8632.167.233.872
8732.167.233.88/3032.167.233.89 to 32.167.233.9032.167.233.912
8832.167.233.92/3032.167.233.93 to 32.167.233.9432.167.233.952
8932.167.233.96/3032.167.233.97 to 32.167.233.9832.167.233.992
9032.167.233.100/3032.167.233.101 to 32.167.233.10232.167.233.1032
9132.167.233.104/3032.167.233.105 to 32.167.233.10632.167.233.1072
9232.167.233.108/3032.167.233.109 to 32.167.233.11032.167.233.1112
9332.167.233.112/3032.167.233.113 to 32.167.233.11432.167.233.1152
9432.167.233.116/3032.167.233.117 to 32.167.233.11832.167.233.1192
9532.167.233.120/3032.167.233.121 to 32.167.233.12232.167.233.1232
9632.167.233.124/3032.167.233.125 to 32.167.233.12632.167.233.1272
9732.167.233.128/3032.167.233.129 to 32.167.233.13032.167.233.1312
9832.167.233.132/3032.167.233.133 to 32.167.233.13432.167.233.1352
9932.167.233.136/3032.167.233.137 to 32.167.233.13832.167.233.1392
10032.167.233.140/3032.167.233.141 to 32.167.233.14232.167.233.1432
10132.167.233.144/3032.167.233.145 to 32.167.233.14632.167.233.1472
10232.167.233.148/3032.167.233.149 to 32.167.233.15032.167.233.1512
10332.167.233.152/3032.167.233.153 to 32.167.233.15432.167.233.1552
10432.167.233.156/3032.167.233.157 to 32.167.233.15832.167.233.1592
10532.167.233.160/3032.167.233.161 to 32.167.233.16232.167.233.1632
10632.167.233.164/3032.167.233.165 to 32.167.233.16632.167.233.1672
10732.167.233.168/3032.167.233.169 to 32.167.233.17032.167.233.1712
10832.167.233.172/3032.167.233.173 to 32.167.233.17432.167.233.1752
10932.167.233.176/3032.167.233.177 to 32.167.233.17832.167.233.1792
11032.167.233.180/3032.167.233.181 to 32.167.233.18232.167.233.1832
11132.167.233.184/3032.167.233.185 to 32.167.233.18632.167.233.1872
11232.167.233.188/3032.167.233.189 to 32.167.233.19032.167.233.1912
11332.167.233.192/3032.167.233.193 to 32.167.233.19432.167.233.1952
11432.167.233.196/3032.167.233.197 to 32.167.233.19832.167.233.1992
11532.167.233.200/3032.167.233.201 to 32.167.233.20232.167.233.2032
11632.167.233.204/3032.167.233.205 to 32.167.233.20632.167.233.2072
11732.167.233.208/3032.167.233.209 to 32.167.233.21032.167.233.2112
11832.167.233.212/3032.167.233.213 to 32.167.233.21432.167.233.2152
11932.167.233.216/3032.167.233.217 to 32.167.233.21832.167.233.2192
12032.167.233.220/3032.167.233.221 to 32.167.233.22232.167.233.2232
12132.167.233.224/3032.167.233.225 to 32.167.233.22632.167.233.2272
12232.167.233.228/3032.167.233.229 to 32.167.233.23032.167.233.2312
12332.167.233.232/3032.167.233.233 to 32.167.233.23432.167.233.2352
12432.167.233.236/3032.167.233.237 to 32.167.233.23832.167.233.2392
12532.167.233.240/3032.167.233.241 to 32.167.233.24232.167.233.2432
12632.167.233.244/3032.167.233.245 to 32.167.233.24632.167.233.2472
12732.167.233.248/3032.167.233.249 to 32.167.233.25032.167.233.2512
12832.167.233.252/3032.167.233.253 to 32.167.233.25432.167.233.2552
12932.167.234.0/3032.167.234.1 to 32.167.234.232.167.234.32
13032.167.234.4/3032.167.234.5 to 32.167.234.632.167.234.72
13132.167.234.8/3032.167.234.9 to 32.167.234.1032.167.234.112
13232.167.234.12/3032.167.234.13 to 32.167.234.1432.167.234.152
13332.167.234.16/3032.167.234.17 to 32.167.234.1832.167.234.192
13432.167.234.20/3032.167.234.21 to 32.167.234.2232.167.234.232
13532.167.234.24/3032.167.234.25 to 32.167.234.2632.167.234.272
13632.167.234.28/3032.167.234.29 to 32.167.234.3032.167.234.312
13732.167.234.32/3032.167.234.33 to 32.167.234.3432.167.234.352
13832.167.234.36/3032.167.234.37 to 32.167.234.3832.167.234.392
13932.167.234.40/3032.167.234.41 to 32.167.234.4232.167.234.432
14032.167.234.44/3032.167.234.45 to 32.167.234.4632.167.234.472
14132.167.234.48/3032.167.234.49 to 32.167.234.5032.167.234.512
14232.167.234.52/3032.167.234.53 to 32.167.234.5432.167.234.552
14332.167.234.56/3032.167.234.57 to 32.167.234.5832.167.234.592
14432.167.234.60/3032.167.234.61 to 32.167.234.6232.167.234.632
14532.167.234.64/3032.167.234.65 to 32.167.234.6632.167.234.672
14632.167.234.68/3032.167.234.69 to 32.167.234.7032.167.234.712
14732.167.234.72/3032.167.234.73 to 32.167.234.7432.167.234.752
14832.167.234.76/3032.167.234.77 to 32.167.234.7832.167.234.792
14932.167.234.80/3032.167.234.81 to 32.167.234.8232.167.234.832
15032.167.234.84/3032.167.234.85 to 32.167.234.8632.167.234.872
15132.167.234.88/3032.167.234.89 to 32.167.234.9032.167.234.912
15232.167.234.92/3032.167.234.93 to 32.167.234.9432.167.234.952
15332.167.234.96/3032.167.234.97 to 32.167.234.9832.167.234.992
15432.167.234.100/3032.167.234.101 to 32.167.234.10232.167.234.1032
15532.167.234.104/3032.167.234.105 to 32.167.234.10632.167.234.1072
15632.167.234.108/3032.167.234.109 to 32.167.234.11032.167.234.1112
15732.167.234.112/3032.167.234.113 to 32.167.234.11432.167.234.1152
15832.167.234.116/3032.167.234.117 to 32.167.234.11832.167.234.1192
15932.167.234.120/3032.167.234.121 to 32.167.234.12232.167.234.1232
16032.167.234.124/3032.167.234.125 to 32.167.234.12632.167.234.1272
16132.167.234.128/3032.167.234.129 to 32.167.234.13032.167.234.1312
16232.167.234.132/3032.167.234.133 to 32.167.234.13432.167.234.1352
16332.167.234.136/3032.167.234.137 to 32.167.234.13832.167.234.1392
16432.167.234.140/3032.167.234.141 to 32.167.234.14232.167.234.1432
16532.167.234.144/3032.167.234.145 to 32.167.234.14632.167.234.1472
16632.167.234.148/3032.167.234.149 to 32.167.234.15032.167.234.1512
16732.167.234.152/3032.167.234.153 to 32.167.234.15432.167.234.1552
16832.167.234.156/3032.167.234.157 to 32.167.234.15832.167.234.1592
16932.167.234.160/3032.167.234.161 to 32.167.234.16232.167.234.1632
17032.167.234.164/3032.167.234.165 to 32.167.234.16632.167.234.1672
17132.167.234.168/3032.167.234.169 to 32.167.234.17032.167.234.1712
17232.167.234.172/3032.167.234.173 to 32.167.234.17432.167.234.1752
17332.167.234.176/3032.167.234.177 to 32.167.234.17832.167.234.1792
17432.167.234.180/3032.167.234.181 to 32.167.234.18232.167.234.1832
17532.167.234.184/3032.167.234.185 to 32.167.234.18632.167.234.1872
17632.167.234.188/3032.167.234.189 to 32.167.234.19032.167.234.1912
17732.167.234.192/3032.167.234.193 to 32.167.234.19432.167.234.1952
17832.167.234.196/3032.167.234.197 to 32.167.234.19832.167.234.1992
17932.167.234.200/3032.167.234.201 to 32.167.234.20232.167.234.2032
18032.167.234.204/3032.167.234.205 to 32.167.234.20632.167.234.2072
18132.167.234.208/3032.167.234.209 to 32.167.234.21032.167.234.2112
18232.167.234.212/3032.167.234.213 to 32.167.234.21432.167.234.2152
18332.167.234.216/3032.167.234.217 to 32.167.234.21832.167.234.2192
18432.167.234.220/3032.167.234.221 to 32.167.234.22232.167.234.2232
18532.167.234.224/3032.167.234.225 to 32.167.234.22632.167.234.2272
18632.167.234.228/3032.167.234.229 to 32.167.234.23032.167.234.2312
18732.167.234.232/3032.167.234.233 to 32.167.234.23432.167.234.2352
18832.167.234.236/3032.167.234.237 to 32.167.234.23832.167.234.2392
18932.167.234.240/3032.167.234.241 to 32.167.234.24232.167.234.2432
19032.167.234.244/3032.167.234.245 to 32.167.234.24632.167.234.2472
19132.167.234.248/3032.167.234.249 to 32.167.234.25032.167.234.2512
19232.167.234.252/3032.167.234.253 to 32.167.234.25432.167.234.2552
19332.167.235.0/3032.167.235.1 to 32.167.235.232.167.235.32
19432.167.235.4/3032.167.235.5 to 32.167.235.632.167.235.72
19532.167.235.8/3032.167.235.9 to 32.167.235.1032.167.235.112
19632.167.235.12/3032.167.235.13 to 32.167.235.1432.167.235.152
19732.167.235.16/3032.167.235.17 to 32.167.235.1832.167.235.192
19832.167.235.20/3032.167.235.21 to 32.167.235.2232.167.235.232
19932.167.235.24/3032.167.235.25 to 32.167.235.2632.167.235.272
20032.167.235.28/3032.167.235.29 to 32.167.235.3032.167.235.312
20132.167.235.32/3032.167.235.33 to 32.167.235.3432.167.235.352
20232.167.235.36/3032.167.235.37 to 32.167.235.3832.167.235.392
20332.167.235.40/3032.167.235.41 to 32.167.235.4232.167.235.432
20432.167.235.44/3032.167.235.45 to 32.167.235.4632.167.235.472
20532.167.235.48/3032.167.235.49 to 32.167.235.5032.167.235.512
20632.167.235.52/3032.167.235.53 to 32.167.235.5432.167.235.552
20732.167.235.56/3032.167.235.57 to 32.167.235.5832.167.235.592
20832.167.235.60/3032.167.235.61 to 32.167.235.6232.167.235.632
20932.167.235.64/3032.167.235.65 to 32.167.235.6632.167.235.672
21032.167.235.68/3032.167.235.69 to 32.167.235.7032.167.235.712
21132.167.235.72/3032.167.235.73 to 32.167.235.7432.167.235.752
21232.167.235.76/3032.167.235.77 to 32.167.235.7832.167.235.792
21332.167.235.80/3032.167.235.81 to 32.167.235.8232.167.235.832
21432.167.235.84/3032.167.235.85 to 32.167.235.8632.167.235.872
21532.167.235.88/3032.167.235.89 to 32.167.235.9032.167.235.912
21632.167.235.92/3032.167.235.93 to 32.167.235.9432.167.235.952
21732.167.235.96/3032.167.235.97 to 32.167.235.9832.167.235.992
21832.167.235.100/3032.167.235.101 to 32.167.235.10232.167.235.1032
21932.167.235.104/3032.167.235.105 to 32.167.235.10632.167.235.1072
22032.167.235.108/3032.167.235.109 to 32.167.235.11032.167.235.1112
22132.167.235.112/3032.167.235.113 to 32.167.235.11432.167.235.1152
22232.167.235.116/3032.167.235.117 to 32.167.235.11832.167.235.1192
22332.167.235.120/3032.167.235.121 to 32.167.235.12232.167.235.1232
22432.167.235.124/3032.167.235.125 to 32.167.235.12632.167.235.1272
22532.167.235.128/3032.167.235.129 to 32.167.235.13032.167.235.1312
22632.167.235.132/3032.167.235.133 to 32.167.235.13432.167.235.1352
22732.167.235.136/3032.167.235.137 to 32.167.235.13832.167.235.1392
22832.167.235.140/3032.167.235.141 to 32.167.235.14232.167.235.1432
22932.167.235.144/3032.167.235.145 to 32.167.235.14632.167.235.1472
23032.167.235.148/3032.167.235.149 to 32.167.235.15032.167.235.1512
23132.167.235.152/3032.167.235.153 to 32.167.235.15432.167.235.1552
23232.167.235.156/3032.167.235.157 to 32.167.235.15832.167.235.1592
23332.167.235.160/3032.167.235.161 to 32.167.235.16232.167.235.1632
23432.167.235.164/3032.167.235.165 to 32.167.235.16632.167.235.1672
23532.167.235.168/3032.167.235.169 to 32.167.235.17032.167.235.1712
23632.167.235.172/3032.167.235.173 to 32.167.235.17432.167.235.1752
23732.167.235.176/3032.167.235.177 to 32.167.235.17832.167.235.1792
23832.167.235.180/3032.167.235.181 to 32.167.235.18232.167.235.1832
23932.167.235.184/3032.167.235.185 to 32.167.235.18632.167.235.1872
24032.167.235.188/3032.167.235.189 to 32.167.235.19032.167.235.1912
24132.167.235.192/3032.167.235.193 to 32.167.235.19432.167.235.1952
24232.167.235.196/3032.167.235.197 to 32.167.235.19832.167.235.1992
24332.167.235.200/3032.167.235.201 to 32.167.235.20232.167.235.2032
24432.167.235.204/3032.167.235.205 to 32.167.235.20632.167.235.2072
24532.167.235.208/3032.167.235.209 to 32.167.235.21032.167.235.2112
24632.167.235.212/3032.167.235.213 to 32.167.235.21432.167.235.2152
24732.167.235.216/3032.167.235.217 to 32.167.235.21832.167.235.2192
24832.167.235.220/3032.167.235.221 to 32.167.235.22232.167.235.2232
24932.167.235.224/3032.167.235.225 to 32.167.235.22632.167.235.2272
25032.167.235.228/3032.167.235.229 to 32.167.235.23032.167.235.2312
25132.167.235.232/3032.167.235.233 to 32.167.235.23432.167.235.2352
25232.167.235.236/3032.167.235.237 to 32.167.235.23832.167.235.2392
25332.167.235.240/3032.167.235.241 to 32.167.235.24232.167.235.2432
25432.167.235.244/3032.167.235.245 to 32.167.235.24632.167.235.2472
25532.167.235.248/3032.167.235.249 to 32.167.235.25032.167.235.2512
25632.167.235.252/3032.167.235.253 to 32.167.235.25432.167.235.2552

IPv4 CIDR reference (/0 to /32)

IPv4 prefix lengths
PrefixSubnet maskWildcardAddressesUsable hostsSizeTypical use
/00.0.0.0255.255.255.2554,294,967,2964,294,967,29416,777,216 × /24
/1128.0.0.0127.255.255.2552,147,483,6482,147,483,6468,388,608 × /24
/2192.0.0.063.255.255.2551,073,741,8241,073,741,8224,194,304 × /24
/3224.0.0.031.255.255.255536,870,912536,870,9102,097,152 × /24
/4240.0.0.015.255.255.255268,435,456268,435,4541,048,576 × /24
/5248.0.0.07.255.255.255134,217,728134,217,726524,288 × /24
/6252.0.0.03.255.255.25567,108,86467,108,862262,144 × /24
/7254.0.0.01.255.255.25533,554,43233,554,430131,072 × /24
/8255.0.0.00.255.255.25516,777,21616,777,21465,536 × /24Old class A; 10.0.0.0/8
/9255.128.0.00.127.255.2558,388,6088,388,60632,768 × /24
/10255.192.0.00.63.255.2554,194,3044,194,30216,384 × /24
/11255.224.0.00.31.255.2552,097,1522,097,1508,192 × /24
/12255.240.0.00.15.255.2551,048,5761,048,5744,096 × /24172.16.0.0/12
/13255.248.0.00.7.255.255524,288524,2862,048 × /24
/14255.252.0.00.3.255.255262,144262,1421,024 × /24
/15255.254.0.00.1.255.255131,072131,070512 × /24
/16255.255.0.00.0.255.25565,53665,534256 × /24Old class B; 192.168.0.0/16
/17255.255.128.00.0.127.25532,76832,766128 × /24
/18255.255.192.00.0.63.25516,38416,38264 × /24
/19255.255.224.00.0.31.2558,1928,19032 × /24
/20255.255.240.00.0.15.2554,0964,09416 × /24
/21255.255.248.00.0.7.2552,0482,0468 × /24
/22255.255.252.00.0.3.2551,0241,0224 × /24Large office or guest Wi-Fi (1,022 hosts)
/23255.255.254.00.0.1.2555125102 × /24Larger office LAN (510 hosts)
/24255.255.255.00.0.0.2552562541 × /24Typical office LAN (old class C)
/25255.255.255.1280.0.0.1271281261/2 of a /24Smaller LAN or VLAN
/26255.255.255.1920.0.0.6364621/4 of a /24Smaller LAN or VLAN
/27255.255.255.2240.0.0.3132301/8 of a /24Small VLAN, phones, cameras
/28255.255.255.2400.0.0.1516141/16 of a /24Small VLAN, phones, cameras
/29255.255.255.2480.0.0.7861/32 of a /24Small fixed public block (5 usable)
/30255.255.255.2520.0.0.3421/64 of a /24Point-to-point (old style)
/31255.255.255.2540.0.0.1221/128 of a /24Point-to-point link (RFC 3021)
/32255.255.255.2550.0.0.0111/256 of a /24One host

IPv6 prefix reference

IPv6 prefix lengths
PrefixAddresses/64 LANs/48 sitesNibbleTypical use
/342,535,295,865,117,307,932,921,825,928,971,026,432 (2^125)2,305,843,009,213,693,95235,184,372,088,832NoAll global unicast (2000::/3)
/165,192,296,858,534,827,628,530,496,329,220,096 (2^112)281,474,976,710,6564,294,967,296Yes
/20324,518,553,658,426,726,783,156,020,576,256 (2^108)17,592,186,044,416268,435,456YesLarge provider allocation (RIPE minimum for some)
/29633,825,300,114,114,700,748,351,602,688 (2^99)34,359,738,368524,288NoRIPE allocation to a provider (often)
/3279,228,162,514,264,337,593,543,950,336 (2^96)4,294,967,29665,536YesProvider allocation (RIPE default)
/364,951,760,157,141,521,099,596,496,896 (2^92)268,435,4564,096Yes
/40309,485,009,821,345,068,724,781,056 (2^88)16,777,216256Yes
/4419,342,813,113,834,066,795,298,816 (2^84)1,048,57616Yes
/481,208,925,819,614,629,174,706,176 (2^80)65,5361YesOne site or organisation (RIPE PI / assignment)
/5275,557,863,725,914,323,419,136 (2^76)4,096Yes
/564,722,366,482,869,645,213,696 (2^72)256YesSmall site or home (common provider assignment)
/60295,147,905,179,352,825,856 (2^68)16YesSome home broadband (16 LANs)
/6418,446,744,073,709,551,616 (2^64)1YesOne LAN or VLAN (needed for SLAAC)
/7272,057,594,037,927,936 (2^56)1/256 of a /64Yes
/80281,474,976,710,656 (2^48)1/65,536 of a /64Yes
/964,294,967,2961/4,294,967,296 of a /64YesEmbeds an IPv4 address (NAT64)
/11265,5361/281,474,976,710,656 of a /64Yes
/1202561/72,057,594,037,927,936 of a /64Yes
/124161/1,152,921,504,606,846,976 of a /64Yes
/12641/4,611,686,018,427,387,904 of a /64No
/12721/9,223,372,036,854,775,808 of a /64NoPoint-to-point link (RFC 6164)
/12811/18,446,744,073,709,551,616 of a /64YesOne host or loopback

Private and special ranges

IPv4

Special-purpose ranges
RangeNameWhat it is
255.255.255.255/32Limited broadcastEvery host on the local network
0.0.0.0/8This networkNot routed; 0.0.0.0 means "any address" in settings
10.0.0.0/8Private (RFC 1918)Office and home networks; not routed on the internet
100.64.0.0/10Shared address space (CGNAT)Used by providers behind carrier-grade NAT (RFC 6598)
127.0.0.0/8LoopbackThis computer
169.254.0.0/16Link-local (APIPA)Self-assigned when no DHCP server answers
172.16.0.0/12Private (RFC 1918)Office and home networks; not routed on the internet
192.0.0.0/24IETF protocol assignmentsSpecial uses such as DS-Lite
192.0.2.0/24Documentation (TEST-NET-1)For examples; never used on a network
192.88.99.0/246to4 relay (deprecated)Formerly anycast for 6to4
192.168.0.0/16Private (RFC 1918)Office and home networks; not routed on the internet
198.18.0.0/15BenchmarkingNetwork equipment testing (RFC 2544)
198.51.100.0/24Documentation (TEST-NET-2)For examples; never used on a network
203.0.113.0/24Documentation (TEST-NET-3)For examples; never used on a network
224.0.0.0/4MulticastOne-to-many traffic, such as IPTV and routing protocols
240.0.0.0/4ReservedFuture use; not usable on most systems

IPv6

Special-purpose ranges
RangeNameWhat it is
::/128UnspecifiedNo address; :: means "any address" in settings
::1/128LoopbackThis computer
::ffff:0:0/96IPv4-mappedAn IPv4 address written as IPv6
64:ff9b::/96NAT64IPv4 addresses reached through a NAT64 gateway
100::/64Discard onlyTraffic sent here is dropped (RFC 6666)
2001:db8::/32DocumentationFor examples; never used on a network
2001::/32TeredoIPv6 tunnelled over IPv4 UDP
2002::/166to4IPv6 tunnelled over IPv4 (largely retired)
3fff::/20DocumentationFor examples (RFC 9637)
fc00::/7Unique local (ULA)Private IPv6, like RFC 1918; usually fd00::/8
fe80::/10Link-localEvery IPv6 interface has one; not routed
ff00::/8MulticastOne-to-many traffic; replaces broadcast
2000::/3Global unicastPublic internet addresses

About this tool

A network is written as an address and a prefix length, such as 192.168.1.0/24: the first 24 bits name the network and the rest number the devices on it. The calculator works out where the network starts and ends, how many devices it holds, its subnet and wildcard masks, and the reverse DNS zone to ask your provider for.

It also splits a network into equal smaller ones (one per VLAN or site), turns a range of addresses into the fewest CIDR blocks for a firewall rule, and lists every IPv4 prefix length and the common IPv6 ones in reference tables.

Common questions

Why are two addresses lost in every IPv4 subnet?

The first address names the network and the last is the broadcast address, so a /24 has 256 addresses but 254 for devices. A /31 (a link between two routers) and a /32 (one host) are the exceptions.

What size of IPv6 network should a LAN use?

Always /64. Devices pick their own address within it (SLAAC), which needs the full 64 bits. A site usually gets a /48 or /56 from its provider, which holds 65,536 or 256 LANs.

What is a wildcard mask?

The subnet mask turned inside out: 255.255.255.0 becomes 0.0.0.255. Cisco access lists and OSPF use it to say which bits must match.

Which ranges can I use inside an office?

IPv4: 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. IPv6: unique local addresses from fd00::/8, though most networks use the public prefix from their provider.