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APPROVED: JM visitor@mygifttonash:~$ subnet.php tty1 · 80×24

Subnet Calculator

CIDR or netmask in — network, broadcast, host range and counts out.

Accepts CIDR notation or address + netmask.
What this page does: it does IPv4 subnet math. Give it a network in CIDR notation (like 10.20.30.0/24) or an address plus a netmask, and it returns the network address, broadcast address, netmask and wildcard mask, the first and last usable host, and how many hosts fit in the subnet. It also notes whether the range is public, private (RFC 1918), loopback, link-local or multicast. Handy when carving up address space, reading firewall rules, or checking whether two hosts share a subnet.
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