Free Online Internet & Network Tools
Check how fast and steady your connection really is, and plan IP networks without a spreadsheet. The speed test measures against Cloudflare’s global network from your browser; the subnet calculator works entirely on your device.
2 tools · free · no sign-up
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IP Subnet Calculator
Free IP subnet calculator for IPv4 and IPv6: network, broadcast, host range, mask and wildcard from any CIDR, plus subnetting, VLSM and route summarisation.
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Internet Speed Test
Free internet speed test: check download and upload speed, ping, jitter and bufferbloat on Wi-Fi, broadband or mobile data — no app, with a data saver mode.
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FAQ
Internet & Network Tools: common questions
Do I need to install anything?
No. Both tools run in any modern browser on a phone or computer, with no app, extension or sign-up.
Where are the DNS tools?
The DNS Lookup and DNS Propagation Checker are with the developer tools.
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