IP & Subnetting tools
Subnetting and address planning tools for IPv4 and IPv6 networks. Calculate prefixes, aggregate routes, translate address formats and plan VLAN or pool allocations without touching a spreadsheet.
CIDR Aggregator
Collapse a messy list of IPv4 networks into the smallest possible set of CIDR blocks - the summarisation a routing protocol or firewall object group should be carrying.
EUI-64 Generator
Turn a MAC address into its modified EUI-64 interface identifier and the resulting SLAAC and link-local IPv6 addresses.
IP Address Converter
Convert an IPv4 or IPv6 address between dotted-decimal, integer, hexadecimal, binary, octal and IPv4-mapped IPv6 forms.
IP Range to CIDR
Convert an arbitrary start-to-end IPv4 range into the minimal set of CIDR blocks that covers it exactly - no more, no less.
IPv4 Subnet Calculator
Enter any IPv4 address with a prefix or mask to get the network, broadcast, usable host range, wildcard mask and host count - including correct /31 and /32 handling.
IPv6 Subnet Calculator
Expand any IPv6 prefix to its network range, address count and scope, and enumerate the child subnets a delegation contains.
Subnet Match
Check which prefixes in a list contain a given IPv4 address, with longest-prefix match highlighted the way a router would resolve it.
Wildcard Mask Calculator
Convert between subnet masks, CIDR prefixes and the inverted wildcard masks that Cisco ACLs and OSPF network statements expect.