perl -MRegexp::Common=net -E "say +(/$RE{net}{IPv4}/?'IP ':'NOT ip ').$_ for @ARGV" 10.10.10.1  888.888.888.888 8.8.8.8 0.0.0.0

IP 10.10.10.1
NOT ip 888.888.888.888
IP 8.8.8.8
IP 0.0.0.0