| Decimal | Keyword | Protocol | References
|
| 0 | - | Reserved | [JBP]
|
| 1 | ICMP | Internet-Control-Message | [97,JBP]
|
| 2 | IGMP | Internet-Group-Management | [43,JBP]
|
| 3 | GGP | Gateway-to-Gateway | [60,MB]
|
| 4 | - | Unassigned | [JBP]
|
| 5 | ST | Stream | [49,JWF]
|
| 6 | TCP | Transmission-Control | [106,JBP]
|
| 7 | UCL | UCL | [PK]
|
| 8 | EGP | Exterior-Gateway-Protocol | [123,DLM1]
|
| 9 | IGP | any-private-interior-gateway | [JBP]
|
| 10 | - | [BBN-RCC-MON-BBN-RCC-Monitoring]
|
| 11 | NVP-II | Network-Voice-Protocol | [22,SC3]
|
| 12 | PUP | PUP | [8,XEROX]
|
| 13 | ARGUS | ARGUS | [RWS4]
|
| 14 | EMCON | EMCON | [BN7]
|
| 15 | XNET | Cross-Net-Debugger | [56,JFH2]
|
| 16 | CHAOS | Chaos | [NC3]
|
| 17 | UDP | User-Datagram | [104,JBP]
|
| 18 | MUX | Multiplexing | [23,JBP]
|
| 19 | DCN-MEAS | DCN-Measurement-Subsystems | [DLM1]
|
| 20 | HMP | Host-Monitoring | [59,RH6]
|
| 21 | PRM | Packet-Radio-Measurement | [ZSU]
|
| 22 | XNS-IDP | XEROX-NS-IDP | [133,XEROX]
|
| 23 | TRUNK-1 | Trunk-1 | [BWB6]
|
| 24 | TRUNK-2 | Trunk-2 | [BWB6]
|
| 25 | LEAF-1 | Leaf-1 | [BWB6]
|
| 26 | LEAF-2 | Leaf-2 | [BWB6]
|
| 27 | RDP | Reliable-Data-Protocol | [138,RH6]
|
| 28 | IRTP | Internet-Reliable-Transaction | [79,TXM]
|
| 29 | ISO-TP4 | ISO-Transport-Protocol-Class-4 | [63,RC77]
|
| 30 | NETBLT | Bulk-Data-Transfer-Protocol | [20,DDC1]
|
| 31 | MFE-NSP | MFE-Network-Services-Protocol | [124,BCH2]
|
| 32 | MERIT-INP | MERIT-Internodal-Protocol | [HWB]
|
| 33 | SEP | Sequential-Exchange-Protocol | [JC120]
|
| 34 | 3PC | Third-Party-Connect-Protocol | [SAF3]
|
| 35-60 | - | Unassigned | [JBP]
|
| 61 | - | any-host-internal-protocol | [JBP]
|
| 62 | CFTP | CFTP | [50,HCF2]
|
| 63 | - | any-local-network | [JBP]
|
| 64 | SAT-EXPAK | SATNET-and-Backroom-EXPAK | [SHB]
|
| 65 | - | Unassigned | [JBP]
|
| 66 | RVD | MIT-Remote-Virtual-Disk-Protocol | [MBG]
|
| 67 | IPPC | Internet-Pluribus-Packet-Core | [SHB]
|
| 68 | - | any-distributed-file-system | [JBP]
|
| 69 | SAT-MON | SATNET-Monitoring | [SHB]
|
| 70 | VISA | VISA-Protocol | [GXT1]
|
| 71 | IPCV | Internet-Packet-Core-Utility | [SHB]
|
| 72-75 | - | Unassigned | [JBP]
|
| 76 | BR-SAT-MON | Backroom-SATNET-Monitoring | [SHB]
|
| 77 | SUN-ND | SUN-ND-PROTOCOL-Temporary | [WM3]
|
| 78 | WB-MON | WIDEBAND-Monitoring | [SHB]
|
| 79 | WB-EXPAK | WIDEBAND-EXPAK | [SHB]
|
| 80 | ISO-IP | ISO-Internet-Protocol | [MTR]
|
| 81 | VMTP | VMTP | [DRC3]
|
| 82 | - | SECURE-VMTP-SECURE-VMTP | [DRC3]
|
| 83 | VINES | VINES | [BXH]
|
| 84 | TTP | TTP | [JXS]
|
| 85 | NSFNET-IGP | NSFNET-IGP | [HWB]
|
| 86 | DGP | Dissimilar-Gateway-Protocol | [74,ML109]
|
| 87 | TCF | TCF | [GAL5]
|
| 88 | IGRP | IGRP | [18,GXS]
|
| 89 | OSPFIGP | OSPFIGP | [83,JTM4]
|
| 90 | Sprite-RPC | Sprite-RPC-Protocol | [143,BXW]
|
| 91 | LARP | Locus-Address-Resolution-Protocol | [BXH]
|
| 92-254 | - | Unassigned | [JBP]
|
| 255 | - | Reserved | [JBP]
|
