Internet Assigned Numbers Authority
Protocol Numbers
Last Updated
2025-07-11
Available Formats
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Registry Included Below
??Assigned Internet Protocol Numbers
Assigned Internet Protocol Numbers
Registration Procedure(s)
IESG Approval or Standards Action
Reference
[RFC5237][RFC7045]
Note
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) [RFC8200], this field
is called the "Next Header" field.
Note
Values that are also IPv6 Extension Header Types should be listed in the
IPv6 Extension Header Types registry at [IANA registry ipv6-parameters].
Available Formats
[IMG]
CSV
Decimal Keyword Protocol IPv6 Extension Reference
Header
0 HOPOPT IPv6 Hop-by-Hop Option Y [RFC8200]
1 ICMP Internet Control Message [RFC792]
2 IGMP Internet Group Management [RFC1112]
3 GGP Gateway-to-Gateway [RFC823]
4 IPv4 IPv4 encapsulation [RFC2003]
5 ST Stream [RFC1190][RFC1819]
6 TCP Transmission Control [RFC9293]
7 CBT CBT [Tony_Ballardie]
8 EGP Exterior Gateway Protocol [RFC888][David_Mills]
any private interior
9 IGP gateway (used by Cisco for [Internet_Assigned_Numbers_Authority]
their IGRP)
10 BBN-RCC-MON BBN RCC Monitoring [Steve_Chipman]
11 NVP-II Network Voice Protocol [RFC741][Steve_Casner]
[Boggs, D., J. Shoch, E. Taft, and R. Metcalfe, "PUP: An Internetwork
12 PUP PUP Architecture", XEROX Palo Alto Research Center, CSL-79-10, July 1979; also
in IEEE Transactions on Communication, Volume COM-28, Number 4, April
1980.][[XEROX]]
13 ARGUS (deprecated) ARGUS [Robert_W_Scheifler]
14 EMCON EMCON [Bich_Nguyen]
15 XNET Cross Net Debugger [Haverty, J., "XNET Formats for Internet Protocol Version 4", IEN 158,
October 1980.][Jack_Haverty]
16 CHAOS Chaos [J_Noel_Chiappa]
17 UDP User Datagram [RFC768][Jon_Postel]
18 MUX Multiplexing [Cohen, D. and J. Postel, "Multiplexing Protocol", IEN 90, USC/Information
Sciences Institute, May 1979.][Jon_Postel]
19 DCN-MEAS DCN Measurement Subsystems [David_Mills]
20 HMP Host Monitoring [RFC869][Bob_Hinden]
21 PRM Packet Radio Measurement [Zaw_Sing_Su]
["The Ethernet, A Local Area Network: Data Link Layer and Physical Layer
Specification", AA-K759B-TK, Digital Equipment Corporation, Maynard, MA.
Also as: "The Ethernet - A Local Area Network", Version 1.0, Digital
Equipment Corporation, Intel Corporation, Xerox Corporation, September
22 XNS-IDP XEROX NS IDP 1980. And: "The Ethernet, A Local Area Network: Data Link Layer and
Physical Layer Specifications", Digital, Intel and Xerox, November 1982.
And: XEROX, "The Ethernet, A Local Area Network: Data Link Layer and
Physical Layer Specification", X3T51/80-50, Xerox Corporation, Stamford,
CT., October 1980.][[XEROX]]
23 TRUNK-1 Trunk-1 [Barry_Boehm]
24 TRUNK-2 Trunk-2 [Barry_Boehm]
25 LEAF-1 Leaf-1 [Barry_Boehm]
26 LEAF-2 Leaf-2 [Barry_Boehm]
27 RDP Reliable Data Protocol [RFC908][Bob_Hinden]
28 IRTP Internet Reliable [RFC938][Trudy_Miller]
Transaction
29 ISO-TP4 ISO Transport Protocol [RFC905][Robert_Cole]
Class 4
30 NETBLT Bulk Data Transfer Protocol [RFC969][David_Clark]
MFE Network Services [Shuttleworth, B., "A Documentary of MFENet, a National Computer Network",
31 MFE-NSP Protocol UCRL-52317, Lawrence Livermore Labs, Livermore, California, June
1977.][Barry_Howard]
32 MERIT-INP MERIT Internodal Protocol [Hans_Werner_Braun]
33 DCCP Datagram Congestion Control [RFC4340]
Protocol
34 3PC Third Party Connect [Stuart_A_Friedberg]
Protocol
35 IDPR Inter-Domain Policy Routing [Martha_Steenstrup]
Protocol
36 XTP XTP [Greg_Chesson]
37 DDP Datagram Delivery Protocol [Wesley_Craig]
38 IDPR-CMTP IDPR Control Message [Martha_Steenstrup]
Transport Proto
39 TP++ TP++ Transport Protocol [Dirk_Fromhein]
40 IL IL Transport Protocol [Dave_Presotto]
41 IPv6 IPv6 encapsulation [RFC2473]
42 SDRP Source Demand Routing [Deborah_Estrin]
Protocol
43 IPv6-Route Routing Header for IPv6 Y [Steve_Deering]
44 IPv6-Frag Fragment Header for IPv6 Y [Steve_Deering]
45 IDRP Inter-Domain Routing [Sue_Hares]
Protocol
46 RSVP Reservation Protocol [RFC2205][RFC3209][Bob_Braden]
47 GRE Generic Routing [RFC2784][Tony_Li]
Encapsulation
48 DSR Dynamic Source Routing [RFC4728]
Protocol
49 BNA BNA [Gary Salamon]
50 ESP Encap Security Payload Y [RFC4303]
51 AH Authentication Header Y [RFC4302]
52 I-NLSP Integrated Net Layer [K_Robert_Glenn]
Security TUBA
53 SWIPE (deprecated) IP with Encryption [John_Ioannidis]
54 NARP NBMA Address Resolution [RFC1735]
Protocol
55 Min-IPv4 Minimal IPv4 Encapsulation [RFC2004][Charlie_Perkins]
Transport Layer Security
56 TLSP Protocol using Kryptonet [Christer_Oberg]
key management
57 SKIP SKIP [Tom_Markson]
58 IPv6-ICMP ICMP for IPv6 [RFC8200]
59 IPv6-NoNxt No Next Header for IPv6 [RFC8200]
60 IPv6-Opts Destination Options for Y [RFC8200]
IPv6
61 any host internal protocol [Internet_Assigned_Numbers_Authority]
62 CFTP CFTP [Forsdick, H., "CFTP", Network Message, Bolt Beranek and Newman, January
1982.][Harry_Forsdick]
63 any local network [Internet_Assigned_Numbers_Authority]
64 SAT-EXPAK SATNET and Backroom EXPAK [Steven_Blumenthal]
65 KRYPTOLAN Kryptolan [Paul Liu]
66 RVD MIT Remote Virtual Disk [Michael_Greenwald]
Protocol
67 IPPC Internet Pluribus Packet [Steven_Blumenthal]
Core
68 any distributed file system [Internet_Assigned_Numbers_Authority]
69 SAT-MON SATNET Monitoring [Steven_Blumenthal]
70 VISA VISA Protocol [Gene_Tsudik]
71 IPCV Internet Packet Core [Steven_Blumenthal]
Utility
72 CPNX Computer Protocol Network [David Mittnacht]
Executive
73 CPHB Computer Protocol Heart [David Mittnacht]
Beat
74 WSN Wang Span Network [Victor Dafoulas]
75 PVP Packet Video Protocol [Steve_Casner]
76 BR-SAT-MON Backroom SATNET Monitoring [Steven_Blumenthal]
77 SUN-ND SUN ND PROTOCOL-Temporary [William_Melohn]
78 WB-MON WIDEBAND Monitoring [Steven_Blumenthal]
79 WB-EXPAK WIDEBAND EXPAK [Steven_Blumenthal]
80 ISO-IP ISO Internet Protocol [Marshall_T_Rose]
81 VMTP VMTP [Dave_Cheriton]
82 SECURE-VMTP SECURE-VMTP [Dave_Cheriton]
83 VINES VINES [Brian Horn]
84 IPTM Internet Protocol Traffic [Jim_Stevens][1]
Manager
85 NSFNET-IGP NSFNET-IGP [Hans_Werner_Braun]
86 DGP Dissimilar Gateway Protocol [M/A-COM Government Systems, "Dissimilar Gateway Protocol Specification,
Draft Version", Contract no. CS901145, November 16, 1987.][Mike_Little]
87 TCF TCF [Guillermo_A_Loyola]
88 EIGRP EIGRP [RFC7868]
89 OSPFIGP OSPFIGP [RFC1583][RFC2328][RFC5340][John_Moy]
[Welch, B., "The Sprite Remote Procedure Call System", Technical Report,
90 Sprite-RPC Sprite RPC Protocol UCB/Computer Science Dept., 86/302, University of California at Berkeley,
June 1986.][Bruce Willins]
91 LARP Locus Address Resolution [Brian Horn]
Protocol
92 MTP Multicast Transport [Susie_Armstrong]
Protocol
93 AX.25 AX.25 Frames [Brian_Kantor]
94 IPIP IP-within-IP Encapsulation [John_Ioannidis]
Protocol
95 MICP (deprecated) Mobile Internetworking [John_Ioannidis]
Control Pro.
96 SCC-SP Semaphore Communications [Howard_Hart]
Sec. Pro.
97 ETHERIP Ethernet-within-IP [RFC3378]
Encapsulation
98 ENCAP Encapsulation Header [RFC1241][Robert_Woodburn]
99 any private encryption [Internet_Assigned_Numbers_Authority]
scheme
100 GMTP GMTP [[RXB5]]
101 IFMP Ipsilon Flow Management [Bob_Hinden][November 1995, 1997.]
Protocol
102 PNNI PNNI over IP [Ross_Callon]
103 PIM Protocol Independent [RFC7761][Dino_Farinacci]
Multicast
104 ARIS ARIS [Nancy_Feldman]
105 SCPS SCPS [Robert_Durst]
106 QNX QNX [Michael_Hunter]
107 A/N Active Networks [Bob_Braden]
108 IPComp IP Payload Compression [RFC2393]
Protocol
109 SNP Sitara Networks Protocol [Manickam_R_Sridhar]
110 Compaq-Peer Compaq Peer Protocol [Victor_Volpe]
111 IPX-in-IP IPX in IP [CJ_Lee]
112 VRRP Virtual Router Redundancy [RFC9568]
Protocol
113 PGM PGM Reliable Transport [Tony_Speakman]
Protocol
114 any 0-hop protocol [Internet_Assigned_Numbers_Authority]
115 L2TP Layer Two Tunneling [RFC3931][Bernard_Aboba]
Protocol
116 DDX D-II Data Exchange (DDX) [John_Worley]
117 IATP Interactive Agent Transfer [John_Murphy]
Protocol
118 STP Schedule Transfer Protocol [Jean_Michel_Pittet]
119 SRP SpectraLink Radio Protocol [Mark_Hamilton]
120 UTI UTI [Peter_Lothberg]
121 SMP Simple Message Protocol [Leif_Ekblad]
122 SM (deprecated) Simple Multicast Protocol [Jon_Crowcroft][draft-perlman-simple-multicast-03]
123 PTP Performance Transparency [Michael_Welzl]
Protocol
124 ISIS over IPv4 [Tony_Przygienda]
125 FIRE [Criag_Partridge]
126 CRTP Combat Radio Transport [Robert_Sautter]
Protocol
127 CRUDP Combat Radio User Datagram [Robert_Sautter]
128 SSCOPMCE [Kurt_Waber]
129 IPLT [[Hollbach]]
130 SPS Secure Packet Shield [Bill_McIntosh]
131 PIPE Private IP Encapsulation [Bernhard_Petri]
within IP
132 SCTP Stream Control Transmission [Randall_R_Stewart]
Protocol
133 FC Fibre Channel [Murali_Rajagopal][RFC6172]
134 RSVP-E2E-IGNORE [RFC3175]
135 Mobility Header Y [RFC6275]
136 UDPLite [RFC3828]
137 MPLS-in-IP [RFC4023]
138 manet MANET Protocols [RFC5498]
139 HIP Host Identity Protocol Y [RFC7401]
140 Shim6 Shim6 Protocol Y [RFC5533]
141 WESP Wrapped Encapsulating [RFC5840]
Security Payload
142 ROHC Robust Header Compression [RFC5858]
143 Ethernet Ethernet [RFC8986]
144 AGGFRAG AGGFRAG encapsulation [RFC9347]
payload for ESP
145 NSH Network Service Header N [RFC9491]
146 Homa Homa N [HomaModule][John_Ousterhout]
147 BIT-EMU Bit-stream Emulation Y [RFC9801]
148-252 Unassigned [Internet_Assigned_Numbers_Authority]
253 Use for experimentation and Y [RFC3692]
testing
254 Use for experimentation and Y [RFC3692]
testing
255 Reserved [Internet_Assigned_Numbers_Authority]
Contact Information
ID Name Contact URI Last Updated
[Barry_Boehm] Barry Boehm mailto:boehm&arpa.mil
[Barry_Howard] Barry Howard mailto:Howard&nmfecc.llnl.gov
[Bernard_Aboba] Bernard Aboba mailto:bernardaµsoft.com 1998-04
[Bernhard_Petri] Bernhard Petri mailto:bernhard.petri&siemens.com 2012-07-09
[Bich_Nguyen] Bich Nguyen mailto:bitnguyen&gmail.com 2023-01-09
[Bill_McIntosh] Bill McIntosh mailto:BMcIntosh&fortresstech.com
[Bob_Braden] Bob Braden mailto:braden&isi.edu 1997-07
[Bob_Hinden] Bob Hinden mailto:bob.hinden&gmail.com 2013-02-17
[Brian_Kantor] Brian Kantor mailto:brian&ucsd.edu
[CJ_Lee] CJ Lee mailto:cj_lee&novell.com 1997-10
[Charlie_Perkins] Charlie Perkins mailto:perk&watson.ibm.com 1994-10
[Christer_Oberg] Christer Oberg mailto:chg&bull.se 1994-10
[Criag_Partridge] Criag Partridge mailto:craig&bbn.com 1999-08
[Dave_Cheriton] Dave Cheriton mailto:cheriton&pescadero.stanford.edu
[Dave_Presotto] Dave Presotto mailto:presotto&plan9.att.com 1995-07
[David_Clark] David Clark mailto:ddc&lcs.mit.edu
[David_Mills] David Mills mailto:Mills&huey.udel.edu
[Deborah_Estrin] Deborah Estrin mailto:estrin&usc.edu
[Dino_Farinacci] Dino Farinacci mailto:dino&cisco.com 1996-03
[Dirk_Fromhein] Dirk Fromhein mailto:df&watershed.com
[Gene_Tsudik] Gene Tsudik mailto:tsudik&usc.edu
[Greg_Chesson] Greg Chesson mailto:Greg&sgi.com
[Guillermo_A_Loyola] Guillermo A. Loyola mailto:LOYOLA&ibm.com
[Hans_Werner_Braun] Hans-Werner Braun mailto:HWB&mcr.umich.edu
[Harry_Forsdick] Harry Forsdick mailto:Forsdick&bbn.com
[Howard_Hart] Howard Hart mailto:hch&hybrid.com
[Internet_Assigned_Numbers_Authority] Internet Assigned Numbers Authority mailto:iana&iana.org 1995-06
[J_Noel_Chiappa] J. Noel Chiappa mailto:JNC&xx.lcs.mit.edu
[Jack_Haverty] Jack Haverty mailto:jhaverty&oracle.com
[Jean_Michel_Pittet] Jean-Michel Pittet mailto:jmp&gandalf.engr.sgi.com 1998-11
[Jim_Stevens] Jim Stevens mailto:jasteven&rockwellcollins.com 2011-01-26
[John_Ioannidis] John Ioannidis mailto:ji&tla.org 2015-01-06
[John_Moy] John Moy mailto:jmoy&proteon.com
[John_Murphy] John Murphy mailto:john.m.murphy&mci.com 1998-10
[John_Ousterhout] John Ousterhout mailto:john.ousterhout&gmail.com 2024-10-24
[John_Worley] John Worley mailto:worley&milehigh.net 1998-06
[Jon_Crowcroft] Jon Crowcroft mailto:jon&cs.ucl.ac.uk 1999-06
[Jon_Postel] Jon Postel mailto:postel&isi.edu
[K_Robert_Glenn] K. Robert Glenn mailto:glenn&osi.ncsl.nist.gov
[Kurt_Waber] Kurt Waber mailto:kurt.waber&swisscom.com 1999-08
[Leif_Ekblad] Leif Ekblad mailto:leif&rdos.net 2012-08-21
[Manickam_R_Sridhar] Manickam R. Sridhar mailto:msridhar&sitaranetworks.com 1997-09
[Mark_Hamilton] Mark Hamilton mailto:mah&spectralink.com 1998-11
[Marshall_T_Rose] Marshall T. Rose mailto:mrose&dbc.mtview.ca.us
[Martha_Steenstrup] Martha Steenstrup mailto:MSteenst&bbn.com
[Michael_Greenwald] Michael Greenwald mailto:Greenwald&scrc-stony-brook.symbolics.com
[Michael_Hunter] Michael Hunter mailto:mphunter&qnx.com 1997-07
[Michael_Welzl] Michael Welzl mailto:michael&tk.uni-linz.ac.at 1999-08
[Mike_Little] Mike Little mailto:little&macom4.arpa
[Murali_Rajagopal] Murali Rajagopal mailto:murali&gadzoox.com 2000-05
[Nancy_Feldman] Nancy Feldman mailto:nkf&vnet.ibm.com 1997-01
[Peter_Lothberg] Peter Lothberg mailto:roll&stupi.se 1999-03
[Randall_R_Stewart] Randall R. Stewart mailto:rrs&lakerest.net 2000-04
[Robert_Cole] Robert Cole mailto:robert&CS.UCL.AC.UK
[Robert_Durst] Robert Durst mailto:durst&mitre.org 1997-03
[Robert_Sautter] Robert Sautter mailto:rsautter&acdnj.itt.com 1999-08
[Robert_W_Scheifler] Robert W. Scheifler mailto:rscheifler&comcast.net 2015-10-06
[Robert_Woodburn] Robert Woodburn mailto:woody&cseic.saic.com
[Ross_Callon] Ross Callon mailto:rcallon&baynetworks.com 1995-12
[Steve_Casner] Steve Casner mailto:casner&isi.edu
[Steve_Chipman] Steve Chipman mailto:Chipman&f.bbn.com
[Steve_Deering] Steve Deering mailto:deering&parc.xerox.com 1995-03
[Steven_Blumenthal] Steven Blumenthal mailto:BLUMENTHAL&vax.bbn.com
[Stuart_A_Friedberg] Stuart A. Friedberg mailto:stuart&cs.wisc.edu
[Sue_Hares] Sue Hares mailto:skh&merit.edu
[Susie_Armstrong] Susie Armstrong mailto:Armstrong.wbst128&xerox.com
[Tom_Markson] Tom Markson mailto:markson&osmosys.ingog.com 1995-09
[Tony_Ballardie] Tony Ballardie mailto:A.Ballardie&cs.ucl.ac.uk
[Tony_Li] Tony Li mailto:tony.li&tony.li 2012-10-17
[Tony_Przygienda] Tony Przygienda mailto:prz&siara.com 1999-08
[Tony_Speakman] Tony Speakman mailto:speakman&cisco.com 1998-01
[Trudy_Miller] Trudy Miller mailto:Trudy&acc.com
[Victor_Volpe] Victor Volpe mailto:vvolpe&smtp.microcom.com 1997-10
[Wesley_Craig] Wesley Craig mailto:Wesley.Craig&terminator.cc.umich.edu
[William_Melohn] William Melohn mailto:Melohn&sun.com
[Zaw_Sing_Su] Zaw-Sing Su mailto:ZSu&tsca.istc.sri.
Footnote
[1] Until March 2023, value 84 was also assigned to TTP (Transaction Transport Protocol).
Licensing Terms
Presently we were in a very dark road, and at a point where it dropped suddenly between steep sides we halted in black shadow. A gleam of pale sand, a whisper of deep flowing waters, and a farther glimmer of more sands beyond them challenged our advance. We had come to a "grapevine ferry." The scow was on the other side, the water too shoal for the horses to swim, and the bottom, most likely, quicksand. Out of the blackness of the opposite shore came a soft, high-pitched, quavering, long-drawn, smothered moan of woe, the call of that snivelling little sinner the screech-owl. Ferry murmured to me to answer it and I sent the same faint horror-stricken tremolo back. Again it came to us, from not farther than one might toss his cap, and I followed Ferry down to the water's edge. The grapevine guy swayed at our side, we heard the scow slide from the sands, and in a few moments, moved by two videttes, it touched our shore. Soon we were across, the two videttes riding with us, and beyond a sharp rise, in an old opening made by the swoop of a hurricane, we entered the silent unlighted bivouac of Ferry's scouts. Ferry got down and sat on the earth talking with Quinn, while the sergeants quietly roused the sleepers to horse. Plotinus is driven by this perplexity to reconsider the whole theory of Matter.477 He takes Aristotle¡¯s doctrine as the groundwork of his investigation. According to this, all existence is divided into Matter and Form. What we know of things¡ªin other words, the sum of their differential characteristics¡ªis their Form. Take away this, and the unknowable residuum is their Matter. Again, Matter is the vague indeterminate something out of which particular Forms are developed. The two are related as Possibility to Actuality, as the more generic to the more specific substance through every grade of classification and composition. Thus there are two Matters, the one sensible and the other intelligible. The former constitutes the common substratum of bodies, the other the common element of ideas.478 The general distinction between Matter and Form was originally suggested to Aristotle by Plato¡¯s remarks on the same subject; but he differs325 from his master in two important particulars. Plato, in his Timaeus, seems to identify Matter with space.479 So far, it is a much more positive conception than the ?λη of the Metaphysics. On the other hand, he constantly opposes it to reality as something non-existent; and he at least implies that it is opposed to absolute good as a principle of absolute evil.480 Thus while the Aristotelian world is formed by the development of Power into Actuality, the Platonic world is composed by the union of Being and not-Being, of the Same and the Different, of the One and the Many, of the Limit and the Unlimited, of Good and Evil, in varying proportions with each other. The Lawton woman had heard of an officer's family at Grant, which was in need of a cook, and had gone there. [See larger version] On the 8th of July an extraordinary Privy Council was summoned. All the members, of whatever party, were desired to attend, and many were the speculations as to the object of their meeting. The general notion was that it involved the continuing or the ending of the war. It turned out to be for the announcement of the king's intended marriage. The lady selected was Charlotte, the second sister of the Duke of Mecklenburg-Strelitz. Apart from the narrowness of her education, the young princess had a considerable amount of amiability, good sense, and domestic taste. These she shared with her intended husband, and whilst they made the royal couple always retiring, at the same time they caused them to give, during their lives, a moral air to their court. On the 8th of September Charlotte arrived at St. James's, and that afternoon the marriage took place, the ceremony being performed by the Archbishop of Canterbury. On the 22nd the coronation took place with the greatest splendour. Mother and girls were inconsolable, for each had something that they were sure "Si would like," and would "do him good," but they knew Josiah Klegg, Sr., well enough to understand what was the condition when he had once made up his mind. CHAPTER V. THE YOUNG RECRUITS Si proceeded to deftly construct a litter out of the two guns, with some sticks that he cut with a knife, and bound with pawpaw strips. His voice had sunk very low, almost to sweetness. A soft flurry of pink went over her face, and her eyelids drooped. Then suddenly she braced herself, pulled herself taut, grew combative again, though her voice shook. HoME²Ô¾®Ïè̫ʲôÐÇ×ù
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