IP Range Expander

Type in the start and end addresses of an arbitrary network range, and it will be expanded to a range that can be expressed in CIDR notation:

Original range: Expanded range:
Start address:
End address:
Range size: 255 addresses 255 addresses

IPv4 / IPv6 Subnet Calculator

IP Address and Netmask:

Example IP Address Inputs Subnet Mask CIDR Notation Wildcard Mask #52 Calculates a network with 52 hosts
2001:0db8:85a3::8a2e:0370:7334/64 Prefix Mask
2001:0db8:85a3::/48/64 Subnet the /48 network into /64 networks