Protocol number

Protocol number

IP is responsible for more than the address that it is most commonly associated with and there are a number of associated protocols that make up the Network Layer. While there are not 256 of them, the field that identifies them is a numeric value between 0 and 256.

In the Internet Protocol version 4 (IPv4) [RFC791] there is a field called “Protocol” to identify the next level protocol. This is an 8 bit field. In Internet Protocol version 6 (IPv6) [RFC2460], this field is called the “Next Header” field.

Protocol numbers

# Protocol Protocol’s Full Name
0 HOPOPT IPv6 Hop-by-Hop Option
1 ICMP Internet Control Message Protocol
2 IGMP Internet Group Management
3 GGP Gateway-to-Gateway
4 IPv4 IPv4 encapsulation Protocol
5 ST Stream
6 TCP Transmission Control Protocol
7 CBT CBT
8 EGP Exterior Gateway Protocol
9 IGP Any private interior gateway (used by Cisco for their IGRP)
10 BBN-RCC-MON BBN RCC Monitoring
11 NVP-II Network Voice Protocol
12 PUP PUP

 

# Protocol Protocol’s Full Name
13 ARGUS ARGUS
14 EMCON EMCON
15 XNET Cross Net Debugger
16 CHAOS Chaos
17 UDP User Datagram Protocol
18 MUX Multiplexing
19 DCN-MEAS DCN Measurement Subsystems
20 HMP Host Monitoring
21 PRM Packet Radio Measurement
22 XNS-IDP XEROX NS IDP
23 TRUNK-1 Trunk-1
24 TRUNK-2 Trunk-2
25 LEAF-1 Leaf-1
26 LEAF-2 Leaf-2
27 RDP Reliable Data Protocol
28 IRTP Internet Reliable Transaction
29 ISO-TP4 ISO Transport Protocol Class 4
30 NETBLT Bulk Data Transfer Protocol
31 MFE-NSP MFE Network Services Protocol
32 MERIT-INP MERIT Internodal Protocol
33 DCCP Datagram Congestion Control Protocol
34 3PC Third Party Connect Protocol
35 IDPR Inter-Domain Policy Routing Protocol
36 XTP XTP

 

# Protocol Protocol’s Full Name
37 DDP Datagram Delivery Protocol
38 IDPR-CMTP IDPR Control Message Transport Proto
39 TP++ TP++ Transport Protocol
40 IL IL Transport Protocol
41 IPv6 IPv6 encapsulation
42 IPv6 SDRPSource Demand Routing Protocol
43 IPv6-Route Routing Header for IPv6
44 IPv6-Frag Fragment Header for IPv6
45 IDRP Inter-Domain Routing Protocol
46 RSVP Reservation Protocol
47 GRE General Routing Encapsulation
48 DSR Dynamic Source Routing Protocol
49 BNA BNA
50 ESP Encap Security Payload
51 AH Authentication Header
52 I-NLSP Integrated Net Layer Security TUBA
53 SWIPE IP with Encryption
54 NARP NBMA Address Resolution Protocol
55 MOBILE IP Mobility
56 TLSP Transport Layer Security Protocol using Kryptonet key management
57 SKIP SKIP
58 IPv6-ICMP ICMP for IPv6
59 IPv6-NoNxt No Next Header for IPv6
60 IPv6-Opts Destination Options for IPv6

 

# Protocol Protocol’s Full Name
61   any host internal protocol
62 CFTP CFTP
63   any local network
64 SAT-EXPAK SATNET and Backroom EXPAK
65 KRYPTOLAN Kryptolan
66 RVD MIT Remote Virtual Disk Protocol
67 IPPC Internet Pluribus Packet Core
68   any distributed file system
69 SAT-MON SATNET Monitoring
70 VISA VISA Protocol
71 IPCV Internet Packet Core Utility
72 CPNX Computer Protocol Network Executive
73 CPHB Computer Protocol Heart Beat
74 WSN Wang Span Network
75 PVP Packet Video Protocol
76 BR-SAT-MON Backroom SATNET Monitoring
77 SUN-ND SUN ND PROTOCOL-Temporary
78 WB-MON WIDEBAND Monitoring
79 WB-EXPAK WIDEBAND EXPAK
80 ISO-IP ISO Internet Protocol
81 VMTP VMTP
82 SECURE-VMTP SECURE-VMTP
83 VINES VINES
84 TTP TTP

 

# Protocol Protocol’s Full Name
84 IPTM Protocol Internet Protocol Traffic
85 NSFNET-IGP NSFNET-IGP
86 DGP Dissimilar Gateway Protocol
87 TCF TCF
88 EIGRP EIGRP
89 OSPFIGP OSPFIGP
90 Sprite-RPC Sprite RPC Protocol
91 LARP Locus Address Resolution Protocol
92 MTP Multicast Transport Protocol
93 AX.25 AX.25 Frames
94 IPIP IP-within-IP Encapsulation Protocol
95 MICP Mobile Internetworking Control Pro.
96 SCC-SP Semaphore Communications Sec. Pro.
97 ETHERIP Ethernet-within-IP Encapsulation
98 ENCAP Encapsulation Header
99   any private encryption scheme
100 GMTP GMTP
101 IFMP Ipsilon Flow Management Protocol
102 PNNI PNNI over IP
103 PIM Protocol Independent Multicast
104 ARIS ARIS
105 SCPS SCPS
106 QNX QNX
107 A/N Active Networks

 

# Protocol Protocol’s Full Name
108 IPComp IP Payload Compression Protocol
109 SNP Sitara Networks Protocol
110 Compaq-Peer Compaq Peer Protocol
111 IPX-in-IP IPX in IP
112 VRRP Virtual Router Redundancy Protocol
113 PGM PGM Reliable Transport Protocol
114   any 0-hop protocol
115 L2TP Layer Two Tunneling Protocol
116 DDX D-II Data Exchange (DDX)
117 IATP Interactive Agent Transfer Protocol
118 STP Schedule Transfer Protocol
119 SRP SpectraLink Radio Protocol
120 UTI UTI
121 SMP Simple Message Protocol
122 SM SM
123 PTP Performance Transparency Protocol
124 ISIS over IPv4  
125 FIRE  
126 CRTP Combat Radio Transport Protocol
127 CRUDP Combat Radio User Datagram
128 SSCOPMCE  
129 IPLT  
130 SPS Secure Packet Shield
131 PIPE Private IP Encapsulation within IP
# Protocol Protocol’s Full Name
132 SCTP Stream Control Transmission Protocol
133 FC Fibre Channel
134 RSVP-E2EIGNORE  
135 Mobility Header  
136 UDPLite  
137 MPLS-in-IP  
138 manet  
139 HIP  
140 Shim6  
141 WESP  
142 ROHC  
143 − 252 Unassigned Unassigned
253   Use for experimentation and testing
254   Use for experimentation and testing
255 Reserved  

Further information can be found by researching RFC 5237.

Protocol number

IP is responsible for more than the address that it is most commonly associated with and there are a number of associated protocols that make up the Network Layer. While there are not 256 of them, the field that identifies them is a numeric value between 0 and 256.

In the Internet Protocol version 4 (IPv4) [RFC791] there is a field called “Protocol” to identify the next level protocol. This is an 8 bit field. In Internet Protocol version 6 (IPv6) [RFC2460], this field is called the “Next Header” field.

Protocol numbers

# Protocol Protocol’s Full Name
0 HOPOPT IPv6 Hop-by-Hop Option

 

# Protocol Protocol’s Full Name
1 ICMP Internet Control Message Protocol
2 IGMP Internet Group Management
3 GGP Gateway-to-Gateway
4 IPv4 IPv4 encapsulation Protocol
5 ST Stream
6 TCP Transmission Control Protocol
7 CBT CBT
8 EGP Exterior Gateway Protocol
9 IGP Any private interior gateway (used by Cisco for their IGRP)
10 BBN-RCC-MON BBN RCC Monitoring
11 NVP-II Network Voice Protocol
12 PUP PUP
13 ARGUS ARGUS
14 EMCON EMCON
15 XNET Cross Net Debugger
16 CHAOS Chaos
17 UDP User Datagram Protocol
18 MUX Multiplexing
19 DCN-MEAS DCN Measurement Subsystems
20 HMP Host Monitoring
21 PRM Packet Radio Measurement
22 XNS-IDP XEROX NS IDP
23 TRUNK-1 Trunk-1
24 TRUNK-2 Trunk-2

 

# Protocol Protocol’s Full Name
25 LEAF-1 Leaf-1
26 LEAF-2 Leaf-2
27 RDP Reliable Data Protocol
28 IRTP Internet Reliable Transaction
29 ISO-TP4 ISO Transport Protocol Class 4
30 NETBLT Bulk Data Transfer Protocol
31 MFE-NSP MFE Network Services Protocol
32 MERIT-INP MERIT Internodal Protocol
33 DCCP Datagram Congestion Control Protocol
34 3PC Third Party Connect Protocol
35 IDPR Inter-Domain Policy Routing Protocol
36 XTP XTP
37 DDP Datagram Delivery Protocol
38 IDPR-CMTP IDPR Control Message Transport Proto
39 TP++ TP++ Transport Protocol
40 IL IL Transport Protocol
41 IPv6 IPv6 encapsulation
42 IPv6 SDRPSource Demand Routing Protocol
43 IPv6-Route Routing Header for IPv6
44 IPv6-Frag Fragment Header for IPv6
45 IDRP Inter-Domain Routing Protocol
46 RSVP Reservation Protocol
47 GRE General Routing Encapsulation
48 DSR Dynamic Source Routing Protocol

 

# Protocol Protocol’s Full Name
49 BNA BNA
50 ESP Encap Security Payload
51 AH Authentication Header
52 I-NLSP Integrated Net Layer Security TUBA
53 SWIPE IP with Encryption
54 NARP NBMA Address Resolution Protocol
55 MOBILE IP Mobility
56 TLSP Transport Layer Security Protocol using Kryptonet key management
57 SKIP SKIP
58 IPv6-ICMP ICMP for IPv6
59 IPv6-NoNxt No Next Header for IPv6
60 IPv6-Opts Destination Options for IPv6
61   any host internal protocol
62 CFTP CFTP
63   any local network
64 SAT-EXPAK SATNET and Backroom EXPAK
65 KRYPTOLAN Kryptolan
66 RVD MIT Remote Virtual Disk Protocol
67 IPPC Internet Pluribus Packet Core
68   any distributed file system
69 SAT-MON SATNET Monitoring
70 VISA VISA Protocol
71 IPCV Internet Packet Core Utility
72 CPNX Computer Protocol Network Executive

 

# Protocol Protocol’s Full Name
73 CPHB Computer Protocol Heart Beat
74 WSN Wang Span Network
75 PVP Packet Video Protocol
76 BR-SAT-MON Backroom SATNET Monitoring
77 SUN-ND SUN ND PROTOCOL-Temporary
78 WB-MON WIDEBAND Monitoring
79 WB-EXPAK WIDEBAND EXPAK
80 ISO-IP ISO Internet Protocol
81 VMTP VMTP
82 SECURE-VMTP SECURE-VMTP
83 VINES VINES
84 TTP TTP
84 IPTM Protocol Internet Protocol Traffic
85 NSFNET-IGP NSFNET-IGP
86 DGP Dissimilar Gateway Protocol
87 TCF TCF
88 EIGRP EIGRP
89 OSPFIGP OSPFIGP
90 Sprite-RPC Sprite RPC Protocol
91 LARP Locus Address Resolution Protocol
92 MTP Multicast Transport Protocol
93 AX.25 AX.25 Frames
94 IPIP IP-within-IP Encapsulation Protocol
95 MICP Mobile Internetworking Control Pro.

 

# Protocol Protocol’s Full Name
96 SCC-SP Semaphore Communications Sec. Pro.
97 ETHERIP Ethernet-within-IP Encapsulation
98 ENCAP Encapsulation Header
99   any private encryption scheme
100 GMTP GMTP
101 IFMP Ipsilon Flow Management Protocol
102 PNNI PNNI over IP
103 PIM Protocol Independent Multicast
104 ARIS ARIS
105 SCPS SCPS
106 QNX QNX
107 A/N Active Networks
108 IPComp IP Payload Compression Protocol
109 SNP Sitara Networks Protocol
110 Compaq-Peer Compaq Peer Protocol
111 IPX-in-IP IPX in IP
112 VRRP Virtual Router Redundancy Protocol
113 PGM PGM Reliable Transport Protocol
114   any 0-hop protocol
115 L2TP Layer Two Tunneling Protocol
116 DDX D-II Data Exchange (DDX)
117 IATP Interactive Agent Transfer Protocol
118 STP Schedule Transfer Protocol
119 SRP SpectraLink Radio Protocol

 

# Protocol Protocol’s Full Name
120 UTI UTI
121 SMP Simple Message Protocol
122 SM SM
123 PTP Performance Transparency Protocol
124 ISIS over IPv4  
125 FIRE  
126 CRTP Combat Radio Transport Protocol
127 CRUDP Combat Radio User Datagram
128 SSCOPMCE  
129 IPLT  
130 SPS Secure Packet Shield
131 PIPE Private IP Encapsulation within IP
132 SCTP Stream Control Transmission Protocol
133 FC Fibre Channel
134 RSVP-E2EIGNORE  
135 Mobility Header  
136 UDPLite  
137 MPLS-in-IP  
138 manet  
139 HIP  
140 Shim6  
141 WESP  
142 ROHC  
143 − 252 Unassigned Unassigned

 

VPN policies

# Protocol Protocol’s Full Name
253   Use for experimentation and testing
254   Use for experimentation and testing
255 Reserved  

Further information can be found by researching RFC 5237.


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