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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.

Network29.167.0.0/16
Usable hosts65,534
Subnet mask255.255.0.0
Addresses65,536
Network address
29.167.0.0
Broadcast address
29.167.255.255
First usable
29.167.0.1
Last usable
29.167.255.254
Usable hosts
65,534 (65,536 less the network and broadcast addresses)
Subnet mask
255.255.0.0
Wildcard mask
0.0.255.255 (Cisco ACLs, OSPF)
Prefix length
/16
Type
Public public
Old class
A (default /8)
As numbers
Hex 1DA70000 · Integer 497483776 to 497549311
Reverse DNS zone
167.29.in-addr.arpa
Binary
Binary view
Binary (network bits bold, host bits grey)Dotted
Address00011101.10100111..00000000.0000000029.167.0.0
Subnet mask11111111.11111111..00000000.00000000255.255.0.0
Network00011101.10100111..00000000.0000000029.167.0.0
Broadcast00011101.10100111..11111111.1111111129.167.255.255
Split into smaller subnets/26
/17 (2)/18 (4)/19 (8)/20 (16)/21 (32)/22 (64)/23 (128)/24 (256)/25 (512)/26 (1,024)/27 (2,048)/28 (4,096)

29.167.0.0/16 makes 1,024 subnets of /26; the first 256 are listed.

Subnets
#SubnetUsable hosts rangeBroadcastHosts
129.167.0.0/2629.167.0.1 to 29.167.0.6229.167.0.6362
229.167.0.64/2629.167.0.65 to 29.167.0.12629.167.0.12762
329.167.0.128/2629.167.0.129 to 29.167.0.19029.167.0.19162
429.167.0.192/2629.167.0.193 to 29.167.0.25429.167.0.25562
529.167.1.0/2629.167.1.1 to 29.167.1.6229.167.1.6362
629.167.1.64/2629.167.1.65 to 29.167.1.12629.167.1.12762
729.167.1.128/2629.167.1.129 to 29.167.1.19029.167.1.19162
829.167.1.192/2629.167.1.193 to 29.167.1.25429.167.1.25562
929.167.2.0/2629.167.2.1 to 29.167.2.6229.167.2.6362
1029.167.2.64/2629.167.2.65 to 29.167.2.12629.167.2.12762
1129.167.2.128/2629.167.2.129 to 29.167.2.19029.167.2.19162
1229.167.2.192/2629.167.2.193 to 29.167.2.25429.167.2.25562
1329.167.3.0/2629.167.3.1 to 29.167.3.6229.167.3.6362
1429.167.3.64/2629.167.3.65 to 29.167.3.12629.167.3.12762
1529.167.3.128/2629.167.3.129 to 29.167.3.19029.167.3.19162
1629.167.3.192/2629.167.3.193 to 29.167.3.25429.167.3.25562
1729.167.4.0/2629.167.4.1 to 29.167.4.6229.167.4.6362
1829.167.4.64/2629.167.4.65 to 29.167.4.12629.167.4.12762
1929.167.4.128/2629.167.4.129 to 29.167.4.19029.167.4.19162
2029.167.4.192/2629.167.4.193 to 29.167.4.25429.167.4.25562
2129.167.5.0/2629.167.5.1 to 29.167.5.6229.167.5.6362
2229.167.5.64/2629.167.5.65 to 29.167.5.12629.167.5.12762
2329.167.5.128/2629.167.5.129 to 29.167.5.19029.167.5.19162
2429.167.5.192/2629.167.5.193 to 29.167.5.25429.167.5.25562
2529.167.6.0/2629.167.6.1 to 29.167.6.6229.167.6.6362
2629.167.6.64/2629.167.6.65 to 29.167.6.12629.167.6.12762
2729.167.6.128/2629.167.6.129 to 29.167.6.19029.167.6.19162
2829.167.6.192/2629.167.6.193 to 29.167.6.25429.167.6.25562
2929.167.7.0/2629.167.7.1 to 29.167.7.6229.167.7.6362
3029.167.7.64/2629.167.7.65 to 29.167.7.12629.167.7.12762
3129.167.7.128/2629.167.7.129 to 29.167.7.19029.167.7.19162
3229.167.7.192/2629.167.7.193 to 29.167.7.25429.167.7.25562
3329.167.8.0/2629.167.8.1 to 29.167.8.6229.167.8.6362
3429.167.8.64/2629.167.8.65 to 29.167.8.12629.167.8.12762
3529.167.8.128/2629.167.8.129 to 29.167.8.19029.167.8.19162
3629.167.8.192/2629.167.8.193 to 29.167.8.25429.167.8.25562
3729.167.9.0/2629.167.9.1 to 29.167.9.6229.167.9.6362
3829.167.9.64/2629.167.9.65 to 29.167.9.12629.167.9.12762
3929.167.9.128/2629.167.9.129 to 29.167.9.19029.167.9.19162
4029.167.9.192/2629.167.9.193 to 29.167.9.25429.167.9.25562
4129.167.10.0/2629.167.10.1 to 29.167.10.6229.167.10.6362
4229.167.10.64/2629.167.10.65 to 29.167.10.12629.167.10.12762
4329.167.10.128/2629.167.10.129 to 29.167.10.19029.167.10.19162
4429.167.10.192/2629.167.10.193 to 29.167.10.25429.167.10.25562
4529.167.11.0/2629.167.11.1 to 29.167.11.6229.167.11.6362
4629.167.11.64/2629.167.11.65 to 29.167.11.12629.167.11.12762
4729.167.11.128/2629.167.11.129 to 29.167.11.19029.167.11.19162
4829.167.11.192/2629.167.11.193 to 29.167.11.25429.167.11.25562
4929.167.12.0/2629.167.12.1 to 29.167.12.6229.167.12.6362
5029.167.12.64/2629.167.12.65 to 29.167.12.12629.167.12.12762
5129.167.12.128/2629.167.12.129 to 29.167.12.19029.167.12.19162
5229.167.12.192/2629.167.12.193 to 29.167.12.25429.167.12.25562
5329.167.13.0/2629.167.13.1 to 29.167.13.6229.167.13.6362
5429.167.13.64/2629.167.13.65 to 29.167.13.12629.167.13.12762
5529.167.13.128/2629.167.13.129 to 29.167.13.19029.167.13.19162
5629.167.13.192/2629.167.13.193 to 29.167.13.25429.167.13.25562
5729.167.14.0/2629.167.14.1 to 29.167.14.6229.167.14.6362
5829.167.14.64/2629.167.14.65 to 29.167.14.12629.167.14.12762
5929.167.14.128/2629.167.14.129 to 29.167.14.19029.167.14.19162
6029.167.14.192/2629.167.14.193 to 29.167.14.25429.167.14.25562
6129.167.15.0/2629.167.15.1 to 29.167.15.6229.167.15.6362
6229.167.15.64/2629.167.15.65 to 29.167.15.12629.167.15.12762
6329.167.15.128/2629.167.15.129 to 29.167.15.19029.167.15.19162
6429.167.15.192/2629.167.15.193 to 29.167.15.25429.167.15.25562
6529.167.16.0/2629.167.16.1 to 29.167.16.6229.167.16.6362
6629.167.16.64/2629.167.16.65 to 29.167.16.12629.167.16.12762
6729.167.16.128/2629.167.16.129 to 29.167.16.19029.167.16.19162
6829.167.16.192/2629.167.16.193 to 29.167.16.25429.167.16.25562
6929.167.17.0/2629.167.17.1 to 29.167.17.6229.167.17.6362
7029.167.17.64/2629.167.17.65 to 29.167.17.12629.167.17.12762
7129.167.17.128/2629.167.17.129 to 29.167.17.19029.167.17.19162
7229.167.17.192/2629.167.17.193 to 29.167.17.25429.167.17.25562
7329.167.18.0/2629.167.18.1 to 29.167.18.6229.167.18.6362
7429.167.18.64/2629.167.18.65 to 29.167.18.12629.167.18.12762
7529.167.18.128/2629.167.18.129 to 29.167.18.19029.167.18.19162
7629.167.18.192/2629.167.18.193 to 29.167.18.25429.167.18.25562
7729.167.19.0/2629.167.19.1 to 29.167.19.6229.167.19.6362
7829.167.19.64/2629.167.19.65 to 29.167.19.12629.167.19.12762
7929.167.19.128/2629.167.19.129 to 29.167.19.19029.167.19.19162
8029.167.19.192/2629.167.19.193 to 29.167.19.25429.167.19.25562
8129.167.20.0/2629.167.20.1 to 29.167.20.6229.167.20.6362
8229.167.20.64/2629.167.20.65 to 29.167.20.12629.167.20.12762
8329.167.20.128/2629.167.20.129 to 29.167.20.19029.167.20.19162
8429.167.20.192/2629.167.20.193 to 29.167.20.25429.167.20.25562
8529.167.21.0/2629.167.21.1 to 29.167.21.6229.167.21.6362
8629.167.21.64/2629.167.21.65 to 29.167.21.12629.167.21.12762
8729.167.21.128/2629.167.21.129 to 29.167.21.19029.167.21.19162
8829.167.21.192/2629.167.21.193 to 29.167.21.25429.167.21.25562
8929.167.22.0/2629.167.22.1 to 29.167.22.6229.167.22.6362
9029.167.22.64/2629.167.22.65 to 29.167.22.12629.167.22.12762
9129.167.22.128/2629.167.22.129 to 29.167.22.19029.167.22.19162
9229.167.22.192/2629.167.22.193 to 29.167.22.25429.167.22.25562
9329.167.23.0/2629.167.23.1 to 29.167.23.6229.167.23.6362
9429.167.23.64/2629.167.23.65 to 29.167.23.12629.167.23.12762
9529.167.23.128/2629.167.23.129 to 29.167.23.19029.167.23.19162
9629.167.23.192/2629.167.23.193 to 29.167.23.25429.167.23.25562
9729.167.24.0/2629.167.24.1 to 29.167.24.6229.167.24.6362
9829.167.24.64/2629.167.24.65 to 29.167.24.12629.167.24.12762
9929.167.24.128/2629.167.24.129 to 29.167.24.19029.167.24.19162
10029.167.24.192/2629.167.24.193 to 29.167.24.25429.167.24.25562
10129.167.25.0/2629.167.25.1 to 29.167.25.6229.167.25.6362
10229.167.25.64/2629.167.25.65 to 29.167.25.12629.167.25.12762
10329.167.25.128/2629.167.25.129 to 29.167.25.19029.167.25.19162
10429.167.25.192/2629.167.25.193 to 29.167.25.25429.167.25.25562
10529.167.26.0/2629.167.26.1 to 29.167.26.6229.167.26.6362
10629.167.26.64/2629.167.26.65 to 29.167.26.12629.167.26.12762
10729.167.26.128/2629.167.26.129 to 29.167.26.19029.167.26.19162
10829.167.26.192/2629.167.26.193 to 29.167.26.25429.167.26.25562
10929.167.27.0/2629.167.27.1 to 29.167.27.6229.167.27.6362
11029.167.27.64/2629.167.27.65 to 29.167.27.12629.167.27.12762
11129.167.27.128/2629.167.27.129 to 29.167.27.19029.167.27.19162
11229.167.27.192/2629.167.27.193 to 29.167.27.25429.167.27.25562
11329.167.28.0/2629.167.28.1 to 29.167.28.6229.167.28.6362
11429.167.28.64/2629.167.28.65 to 29.167.28.12629.167.28.12762
11529.167.28.128/2629.167.28.129 to 29.167.28.19029.167.28.19162
11629.167.28.192/2629.167.28.193 to 29.167.28.25429.167.28.25562
11729.167.29.0/2629.167.29.1 to 29.167.29.6229.167.29.6362
11829.167.29.64/2629.167.29.65 to 29.167.29.12629.167.29.12762
11929.167.29.128/2629.167.29.129 to 29.167.29.19029.167.29.19162
12029.167.29.192/2629.167.29.193 to 29.167.29.25429.167.29.25562
12129.167.30.0/2629.167.30.1 to 29.167.30.6229.167.30.6362
12229.167.30.64/2629.167.30.65 to 29.167.30.12629.167.30.12762
12329.167.30.128/2629.167.30.129 to 29.167.30.19029.167.30.19162
12429.167.30.192/2629.167.30.193 to 29.167.30.25429.167.30.25562
12529.167.31.0/2629.167.31.1 to 29.167.31.6229.167.31.6362
12629.167.31.64/2629.167.31.65 to 29.167.31.12629.167.31.12762
12729.167.31.128/2629.167.31.129 to 29.167.31.19029.167.31.19162
12829.167.31.192/2629.167.31.193 to 29.167.31.25429.167.31.25562
12929.167.32.0/2629.167.32.1 to 29.167.32.6229.167.32.6362
13029.167.32.64/2629.167.32.65 to 29.167.32.12629.167.32.12762
13129.167.32.128/2629.167.32.129 to 29.167.32.19029.167.32.19162
13229.167.32.192/2629.167.32.193 to 29.167.32.25429.167.32.25562
13329.167.33.0/2629.167.33.1 to 29.167.33.6229.167.33.6362
13429.167.33.64/2629.167.33.65 to 29.167.33.12629.167.33.12762
13529.167.33.128/2629.167.33.129 to 29.167.33.19029.167.33.19162
13629.167.33.192/2629.167.33.193 to 29.167.33.25429.167.33.25562
13729.167.34.0/2629.167.34.1 to 29.167.34.6229.167.34.6362
13829.167.34.64/2629.167.34.65 to 29.167.34.12629.167.34.12762
13929.167.34.128/2629.167.34.129 to 29.167.34.19029.167.34.19162
14029.167.34.192/2629.167.34.193 to 29.167.34.25429.167.34.25562
14129.167.35.0/2629.167.35.1 to 29.167.35.6229.167.35.6362
14229.167.35.64/2629.167.35.65 to 29.167.35.12629.167.35.12762
14329.167.35.128/2629.167.35.129 to 29.167.35.19029.167.35.19162
14429.167.35.192/2629.167.35.193 to 29.167.35.25429.167.35.25562
14529.167.36.0/2629.167.36.1 to 29.167.36.6229.167.36.6362
14629.167.36.64/2629.167.36.65 to 29.167.36.12629.167.36.12762
14729.167.36.128/2629.167.36.129 to 29.167.36.19029.167.36.19162
14829.167.36.192/2629.167.36.193 to 29.167.36.25429.167.36.25562
14929.167.37.0/2629.167.37.1 to 29.167.37.6229.167.37.6362
15029.167.37.64/2629.167.37.65 to 29.167.37.12629.167.37.12762
15129.167.37.128/2629.167.37.129 to 29.167.37.19029.167.37.19162
15229.167.37.192/2629.167.37.193 to 29.167.37.25429.167.37.25562
15329.167.38.0/2629.167.38.1 to 29.167.38.6229.167.38.6362
15429.167.38.64/2629.167.38.65 to 29.167.38.12629.167.38.12762
15529.167.38.128/2629.167.38.129 to 29.167.38.19029.167.38.19162
15629.167.38.192/2629.167.38.193 to 29.167.38.25429.167.38.25562
15729.167.39.0/2629.167.39.1 to 29.167.39.6229.167.39.6362
15829.167.39.64/2629.167.39.65 to 29.167.39.12629.167.39.12762
15929.167.39.128/2629.167.39.129 to 29.167.39.19029.167.39.19162
16029.167.39.192/2629.167.39.193 to 29.167.39.25429.167.39.25562
16129.167.40.0/2629.167.40.1 to 29.167.40.6229.167.40.6362
16229.167.40.64/2629.167.40.65 to 29.167.40.12629.167.40.12762
16329.167.40.128/2629.167.40.129 to 29.167.40.19029.167.40.19162
16429.167.40.192/2629.167.40.193 to 29.167.40.25429.167.40.25562
16529.167.41.0/2629.167.41.1 to 29.167.41.6229.167.41.6362
16629.167.41.64/2629.167.41.65 to 29.167.41.12629.167.41.12762
16729.167.41.128/2629.167.41.129 to 29.167.41.19029.167.41.19162
16829.167.41.192/2629.167.41.193 to 29.167.41.25429.167.41.25562
16929.167.42.0/2629.167.42.1 to 29.167.42.6229.167.42.6362
17029.167.42.64/2629.167.42.65 to 29.167.42.12629.167.42.12762
17129.167.42.128/2629.167.42.129 to 29.167.42.19029.167.42.19162
17229.167.42.192/2629.167.42.193 to 29.167.42.25429.167.42.25562
17329.167.43.0/2629.167.43.1 to 29.167.43.6229.167.43.6362
17429.167.43.64/2629.167.43.65 to 29.167.43.12629.167.43.12762
17529.167.43.128/2629.167.43.129 to 29.167.43.19029.167.43.19162
17629.167.43.192/2629.167.43.193 to 29.167.43.25429.167.43.25562
17729.167.44.0/2629.167.44.1 to 29.167.44.6229.167.44.6362
17829.167.44.64/2629.167.44.65 to 29.167.44.12629.167.44.12762
17929.167.44.128/2629.167.44.129 to 29.167.44.19029.167.44.19162
18029.167.44.192/2629.167.44.193 to 29.167.44.25429.167.44.25562
18129.167.45.0/2629.167.45.1 to 29.167.45.6229.167.45.6362
18229.167.45.64/2629.167.45.65 to 29.167.45.12629.167.45.12762
18329.167.45.128/2629.167.45.129 to 29.167.45.19029.167.45.19162
18429.167.45.192/2629.167.45.193 to 29.167.45.25429.167.45.25562
18529.167.46.0/2629.167.46.1 to 29.167.46.6229.167.46.6362
18629.167.46.64/2629.167.46.65 to 29.167.46.12629.167.46.12762
18729.167.46.128/2629.167.46.129 to 29.167.46.19029.167.46.19162
18829.167.46.192/2629.167.46.193 to 29.167.46.25429.167.46.25562
18929.167.47.0/2629.167.47.1 to 29.167.47.6229.167.47.6362
19029.167.47.64/2629.167.47.65 to 29.167.47.12629.167.47.12762
19129.167.47.128/2629.167.47.129 to 29.167.47.19029.167.47.19162
19229.167.47.192/2629.167.47.193 to 29.167.47.25429.167.47.25562
19329.167.48.0/2629.167.48.1 to 29.167.48.6229.167.48.6362
19429.167.48.64/2629.167.48.65 to 29.167.48.12629.167.48.12762
19529.167.48.128/2629.167.48.129 to 29.167.48.19029.167.48.19162
19629.167.48.192/2629.167.48.193 to 29.167.48.25429.167.48.25562
19729.167.49.0/2629.167.49.1 to 29.167.49.6229.167.49.6362
19829.167.49.64/2629.167.49.65 to 29.167.49.12629.167.49.12762
19929.167.49.128/2629.167.49.129 to 29.167.49.19029.167.49.19162
20029.167.49.192/2629.167.49.193 to 29.167.49.25429.167.49.25562
20129.167.50.0/2629.167.50.1 to 29.167.50.6229.167.50.6362
20229.167.50.64/2629.167.50.65 to 29.167.50.12629.167.50.12762
20329.167.50.128/2629.167.50.129 to 29.167.50.19029.167.50.19162
20429.167.50.192/2629.167.50.193 to 29.167.50.25429.167.50.25562
20529.167.51.0/2629.167.51.1 to 29.167.51.6229.167.51.6362
20629.167.51.64/2629.167.51.65 to 29.167.51.12629.167.51.12762
20729.167.51.128/2629.167.51.129 to 29.167.51.19029.167.51.19162
20829.167.51.192/2629.167.51.193 to 29.167.51.25429.167.51.25562
20929.167.52.0/2629.167.52.1 to 29.167.52.6229.167.52.6362
21029.167.52.64/2629.167.52.65 to 29.167.52.12629.167.52.12762
21129.167.52.128/2629.167.52.129 to 29.167.52.19029.167.52.19162
21229.167.52.192/2629.167.52.193 to 29.167.52.25429.167.52.25562
21329.167.53.0/2629.167.53.1 to 29.167.53.6229.167.53.6362
21429.167.53.64/2629.167.53.65 to 29.167.53.12629.167.53.12762
21529.167.53.128/2629.167.53.129 to 29.167.53.19029.167.53.19162
21629.167.53.192/2629.167.53.193 to 29.167.53.25429.167.53.25562
21729.167.54.0/2629.167.54.1 to 29.167.54.6229.167.54.6362
21829.167.54.64/2629.167.54.65 to 29.167.54.12629.167.54.12762
21929.167.54.128/2629.167.54.129 to 29.167.54.19029.167.54.19162
22029.167.54.192/2629.167.54.193 to 29.167.54.25429.167.54.25562
22129.167.55.0/2629.167.55.1 to 29.167.55.6229.167.55.6362
22229.167.55.64/2629.167.55.65 to 29.167.55.12629.167.55.12762
22329.167.55.128/2629.167.55.129 to 29.167.55.19029.167.55.19162
22429.167.55.192/2629.167.55.193 to 29.167.55.25429.167.55.25562
22529.167.56.0/2629.167.56.1 to 29.167.56.6229.167.56.6362
22629.167.56.64/2629.167.56.65 to 29.167.56.12629.167.56.12762
22729.167.56.128/2629.167.56.129 to 29.167.56.19029.167.56.19162
22829.167.56.192/2629.167.56.193 to 29.167.56.25429.167.56.25562
22929.167.57.0/2629.167.57.1 to 29.167.57.6229.167.57.6362
23029.167.57.64/2629.167.57.65 to 29.167.57.12629.167.57.12762
23129.167.57.128/2629.167.57.129 to 29.167.57.19029.167.57.19162
23229.167.57.192/2629.167.57.193 to 29.167.57.25429.167.57.25562
23329.167.58.0/2629.167.58.1 to 29.167.58.6229.167.58.6362
23429.167.58.64/2629.167.58.65 to 29.167.58.12629.167.58.12762
23529.167.58.128/2629.167.58.129 to 29.167.58.19029.167.58.19162
23629.167.58.192/2629.167.58.193 to 29.167.58.25429.167.58.25562
23729.167.59.0/2629.167.59.1 to 29.167.59.6229.167.59.6362
23829.167.59.64/2629.167.59.65 to 29.167.59.12629.167.59.12762
23929.167.59.128/2629.167.59.129 to 29.167.59.19029.167.59.19162
24029.167.59.192/2629.167.59.193 to 29.167.59.25429.167.59.25562
24129.167.60.0/2629.167.60.1 to 29.167.60.6229.167.60.6362
24229.167.60.64/2629.167.60.65 to 29.167.60.12629.167.60.12762
24329.167.60.128/2629.167.60.129 to 29.167.60.19029.167.60.19162
24429.167.60.192/2629.167.60.193 to 29.167.60.25429.167.60.25562
24529.167.61.0/2629.167.61.1 to 29.167.61.6229.167.61.6362
24629.167.61.64/2629.167.61.65 to 29.167.61.12629.167.61.12762
24729.167.61.128/2629.167.61.129 to 29.167.61.19029.167.61.19162
24829.167.61.192/2629.167.61.193 to 29.167.61.25429.167.61.25562
24929.167.62.0/2629.167.62.1 to 29.167.62.6229.167.62.6362
25029.167.62.64/2629.167.62.65 to 29.167.62.12629.167.62.12762
25129.167.62.128/2629.167.62.129 to 29.167.62.19029.167.62.19162
25229.167.62.192/2629.167.62.193 to 29.167.62.25429.167.62.25562
25329.167.63.0/2629.167.63.1 to 29.167.63.6229.167.63.6362
25429.167.63.64/2629.167.63.65 to 29.167.63.12629.167.63.12762
25529.167.63.128/2629.167.63.129 to 29.167.63.19029.167.63.19162
25629.167.63.192/2629.167.63.193 to 29.167.63.25429.167.63.25562

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.