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CIDR to IP Range Converter

Convert a CIDR block to its first and last IP, or find the smallest CIDR that covers two IP addresses.

Mode
Examples:

Enter a CIDR block to see its full IP range

Related Tools

Subnet Calculator

Enter any IPv4 address and CIDR prefix or dotted subnet mask like 255.255.255.0. Network address, broadcast, host range, and wildcard mask calculate instantly. The built-in visual subnet calculator lets you split and rejoin blocks interactively.

CIDR Range Viewer

List every IP address in a subnet block. Enter a network address and CIDR prefix - usable hosts, network and broadcast addresses are highlighted.

IP ↔ Binary

Convert an IPv4 address to its 32 bits and back, or see the 128 bits of an IPv6 address. Click any IPv4 bit to toggle it, or give an IPv6 prefix to see its network and host parts.

About this tool

CIDR (Classless Inter-Domain Routing) notation represents an IP address block as a network address followed by a prefix length, e.g. 192.168.0.0/24. The prefix length determines the number of fixed bits in the network portion - the remaining bits define the host range.

The Range to CIDR mode finds the smallest CIDR block whose network and broadcast addresses encompass both input IPs. Note that the resulting block may include IP addresses outside the specified range when the range does not align exactly to a CIDR boundary.