ipcalc — IPv4 calculator online

Network summary

Address

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Netmask

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Netmask (hex)

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Network

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Broadcast

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Host min

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Host max

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Hosts/net

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Binary view

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Special RFC ranges

This app flags RFC 1918 (private), RFC 3927 (link-local), RFC 5735 (special-use), and RFC 5737 (documentation) ranges.

Inspired by ipcalc’s simple IPv4 calculator outputs.
Tip: you can paste “10.0.0.1/24” or “192.168.1.10 255.255.255.0”.