ICMP Message Types

Message types used by the Internet Control Message Protocol. Covers ICMPv4 (RFC 792) for IPv4 networks and ICMPv6 (RFC 4443) for IPv6 networks. Both protocols carry control and error messages between IP hosts and routers.

38 codes

• 0 Echo Reply
• 3-0 Destination Unreachable: Net Unreachable
• 3-1 Destination Unreachable: Host Unreachable
• 3-10 Destination Unreachable: Communication with Destination Host Administratively Prohibited
• 3-13 Destination Unreachable: Communication Administratively Prohibited
• 3-2 Destination Unreachable: Protocol Unreachable
• 3-3 Destination Unreachable: Port Unreachable
• 3-4 Destination Unreachable: Fragmentation Needed and DF Set
• 3-5 Destination Unreachable: Source Route Failed
• 3-6 Destination Unreachable: Destination Network Unknown
• 3-7 Destination Unreachable: Destination Host Unknown
• 3-9 Destination Unreachable: Communication with Destination Network Administratively Prohibited
• 3 Destination Unreachable
• 4 Source Quench
• 5 Redirect
• 8 Echo Request
• 9 Router Advertisement
• 10 Router Solicitation
• 11-0 Time Exceeded: TTL Exceeded in Transit
• 11-1 Time Exceeded: Fragment Reassembly Time Exceeded
• 11 Time Exceeded
• 12 Parameter Problem
• 13 Timestamp Request
• 14 Timestamp Reply
• 17 Address Mask Request
• 18 Address Mask Reply
• icmpv6-1 ICMPv6 Destination Unreachable
• icmpv6-128 ICMPv6 Echo Request
• icmpv6-129 ICMPv6 Echo Reply
• icmpv6-133 ICMPv6 Router Solicitation
• icmpv6-134 ICMPv6 Router Advertisement
• icmpv6-135 ICMPv6 Neighbor Solicitation
• icmpv6-136 ICMPv6 Neighbor Advertisement
• icmpv6-137 ICMPv6 Redirect
• icmpv6-143 ICMPv6 Multicast Listener Report v2
• icmpv6-2 ICMPv6 Packet Too Big
• icmpv6-3 ICMPv6 Time Exceeded
• icmpv6-4 ICMPv6 Parameter Problem