IPv4 CIDR Calc

Quickly calculate IPv4 subnets, CIDR ranges, network and broadcast addresses, and usable host ranges. View results in decimal, binary, and hexadecimal.

IPv4 CIDR Calc is a focused IPv4 subnet calculator for iPhone and iPad.

Enter an IPv4 address with a CIDR prefix, subnet mask, or full CIDR notation, and instantly see the network details you need. The app calculates network address, broadcast address, usable host range, total addresses, usable hosts, subnet mask, wildcard mask, host bits, and network bits.

Key features:

• IPv4 address + CIDR calculation
• IPv4 address + subnet mask calculation
• Full CIDR input such as 192.168.1.10/24
• Decimal, binary, and hexadecimal views
• Network and broadcast addresses
• First and last usable host
• Total addresses and usable host count
• IPv4 class A/B/C/D/E
• Private, loopback, link-local, multicast, reserved, broadcast, and documentation address detection
• Handles special prefixes such as /0, /31, and /32

IPv4 CIDR Calc is useful for network engineers, system administrators, students, certification study, lab work, firewall rules, router settings, and quick subnet checks.

This app is IPv4 only. IPv6 calculation is not included.