CheckRelayIP reports whether an IP relayed from the given sender IP is a valid connection target.

IsLAN reports whether an IP is a local network address.

IsSpecialNetwork reports whether an IP is located in a special-use network range This includes broadcast, multicast and documentation addresses.

IsTemporaryError checks whether the given error should be considered temporary.

NewIPTracker creates an IP tracker.

ParseNetlist parses a comma-separated list of CIDR masks.

SameNet reports whether two IP addresses have an equal prefix of the given bit length.

DistinctNetSet tracks IPs, ensuring that at most N of them fall into the same network range.

IPTracker predicts the external endpoint, i.e.

Netlist is a list of IP networks.