AddrPortFromNet converts a net.Addr into a netip.AddrPort.

HostID masks out the 'bits' most-significant bits of addr.

SubnetRange returns the amount to add to network.Addr() in order to yield the first and last addresses in subnet, respectively.

ToIPNet converts p into a *net.IPNet, returning nil if p is not valid.

ToPrefix converts n into a netip.Prefix.