IPv4 Subnet Calculator

CIDR, netmask, broadcast, and host range for IPv4 subnets — calculated locally.

100% In-Browser & Private — your data never leaves this device
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How to use the IPv4 Subnet Calculator

  1. Enter an IP with CIDR (192.168.1.1/24) or IP + netmask.
  2. Review network, broadcast, usable hosts, and binary forms.

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