Useful
tools

Everything runs right here in your browser. What you paste never leaves this page — only DNS lookups go to Google Public DNS, Whois asks the domain or IP registry, My IP asks ipwho.is, and the calculator fetches exchange rates.

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Subnet calculator (CIDR)

IPv4 or IPv6 with a prefix (10.0.0.0/22, 2001:db8::/48) or an IPv4 mask (192.168.1.10 255.255.255.0): network, broadcast, host range, mask, wildcard and how many addresses fit. Can split a network into smaller subnets.

Address / prefix Split into