ICMP宛先到達不能メッセージコード一覧表
| コード | メッセージ |
| 0 | Network Unreachable |
| 1 | Host Unreachable |
| 2 | Protocol Unreachable |
| 3 | Port Unreachable |
| 4 | Fragmentation Needed and Don't Fragment was Set |
| 5 | Source Route Failed |
| 6 | Destination Network Unknown |
| 7 | Destination Host Unknown |
| 8 | Source Host Isolated |
| 9 | Communication with Destination Network is Administratively Prohibited |
| 10 | Communication with Destination Host is Administratively Prohibited |
| 11 | Destination Network Unreachable for Type of Service |
| 12 | Destination Host Unreachable for Type of Service |
