Matching Pairs ICMP Destination UnreachableOnline version Match the destination unreachable error codes. by Zayne England 1 IPv4 1 2 IPv6 2 3 IPv6 4 4 IPv4 2 5 IPv6 1 6 IPv4 0 7 IPv6 0 8 IPv4 3 9 IPv6 3 Port unreachable No route to destination Communication with the destination is administratively prohibited Address unreachable Protocol unreachable Beyond scope of the source address Host unreachable Port unreachable Net unreachable