Validin CIDR Calculators
Individual IP/CIDR Calculators
Range to CIDRs
Given first and last IP, convert to CIDRs
IP/CIDR fencepost IPs
Find IPs and CIDRs at the beginning/end ranges of given
CIDR Siblings
Find previous and next CIDRs that are the same size as the given CIDR
Set Calculators
Simplify
Find the minimal CIDR representation for a set of IPs and CIDRs
Inverse
Return the inverse of the given set of CIDRs
Decompose
Break a CIDR or CIDRs into CIDRs no larger than N prefix bits
Relative Complement
Subtract the CIDRs in B from the CIDRs in A. If part of a CIDR in A overlaps with B, return the nonoverlapping part.
Overlap
Find the CIDRs in A that include any CIDRs from B.