CIDR (Classless Inter-Domain Routing) is an IP address allocation method, formatted as IP/prefix, e.g. 192.168.1.0/24.

Does it support IPv6?

Currently only IPv4 is supported. IPv6 support is planned.

How is host count calculated?

Host count = 2^(32-prefix) - 2 (minus network and broadcast). /31 and /32 have special rules.

IP Address Range Calculator - CIDR Subnet Calculator

Home › Tools› IPAddressCalculate

Free online IP address range calculator. Supports CIDR input, auto-calculates network address, broadcast address, usable IP range, subnet mask and host count.

Zero Deps · Works Offline

🌐 CIDR Input

IP/CIDR Address

Copied to clipboard

🌐 IP Address Range Calculator

🌐 CIDR Input

📊 Results

🌐 IP Address Range Calculator

🌐 CIDR Input

📊 Results

🔗 Related Tools