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Speed and call quality testTest delay, jitter and speed, with a focus on phone calls.My IP addressYour public IPv4 and IPv6 addresses, provider and address range.WhoIs lookupWho owns a domain or IP address, when it expires, and its DNS.DNS reportEvery DNS record for a domain, with email setup checked.IP subnet calculatorWork out a network's range, mask and hosts, and split it into subnets.

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VoIP test

Find out whether your internet connection is good enough for clear phone calls, in about 30 seconds.

What it checks

Start the VoIP test

About this tool

VoIP phones send your voice as a stream of small packets. Calls break up, echo or drop when those packets arrive late, unevenly or not at all, even on a fast line. The test measures exactly that and turns it into the score phone engineers use.

For problems that come and go, start the continuous monitor and leave it running: it records each minute so you can match bad calls to bad moments.

Common questions

What result do I need for VoIP?

Delay under 50 ms, jitter under 10 ms and no packet loss give clear calls. A call quality score of 4 or more out of 5 is good.

My speed test is fine but calls are poor. Why?

Calls need steady delay more than speed. A busy line, Wi-Fi or an overloaded router adds jitter and loss that speed tests never show.

Should I test on Wi-Fi?

Test where the phone is. If a desk phone is cabled, test on a cabled computer; if people call from laptops on Wi-Fi, test on Wi-Fi too.