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IP & CIDR Subnet Calculator

Calculate IPv4 and IPv6 network boundaries and subnet information without disclosing addresses through external lookup services.

About IP & CIDRFeatures & how to use

Calculate IPv4 and IPv6 CIDR networks, ranges, masks and subnets locally without performing WHOIS, DNS, ASN or geolocation lookups.

What it can do

  • Calculate IPv4 and IPv6 network ranges.
  • Display masks, prefixes and address counts.
  • Split networks into smaller subnets.

How to use it

  1. Enter an IPv4, IPv6 or CIDR value.
  2. Optionally choose a smaller subnet prefix.
  3. Review and copy the calculated network data.