Tools · Dev utilities

IP / CIDR calculator

IPv4 and IPv6 CIDR math: network, broadcast, first / last host, mask, host count, classification.

CIDR or IP

Network10.0.0.0/24

First host10.0.0.1

Last host10.0.0.254

Broadcast10.0.0.255

Netmask255.255.255.0

Total addresses256

Usable hosts254

ClassificationPrivate (10.0.0.0/8)

The link encodes your inputs in the URL fragment. Nothing is uploaded.