Internet Protocol Version 4 (IPv4) Parameters (original) (raw)

Last Updated

2018-05-03

Available Formats

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Registries Included Below

IP Option Numbers

Registration Procedure(s)

Not defined

Note

The Internet Protocol (IP) has provision for optional header fields identified by an option type field. Options 0 and 1 are exactly one octet which is their type field. All other options have their one octet type field, followed by a one octet length field, followed by length-2 octets of option data. The option type field is sub-divided into a one bit copied flag, a two bit class field, and a five bit option number. These taken together form an eight bit value for the option type field. IP options are commonly referred to by this value.

Available Formats

CSV

Copy Class Number Value Name Reference
0 0 0 0 EOOL - End of Options List [RFC791][Jon_Postel]
0 0 1 1 NOP - No Operation [RFC791][Jon_Postel]
1 0 2 130 SEC - Security [RFC1108]
1 0 3 131 LSR - Loose Source Route [RFC791][Jon_Postel]
0 2 4 68 TS - Time Stamp [RFC791][Jon_Postel]
1 0 5 133 E-SEC - Extended Security [RFC1108]
1 0 6 134 CIPSO - Commercial Security [draft-ietf-cipso-ipsecurity-01]
0 0 7 7 RR - Record Route [RFC791][Jon_Postel]
1 0 8 136 SID - Stream ID [RFC791][Jon_Postel][RFC6814][1]
1 0 9 137 SSR - Strict Source Route [RFC791][Jon_Postel]
0 0 10 10 ZSU - Experimental Measurement [ZSu]
0 0 11 11 MTUP - MTU Probe [RFC1063][RFC1191][1]
0 0 12 12 MTUR - MTU Reply [RFC1063][RFC1191][1]
1 2 13 205 FINN - Experimental Flow Control [Greg_Finn]
1 0 14 142 VISA - Experimental Access Control [Deborah_Estrin][RFC6814][1]
0 0 15 15 ENCODE - ??? [VerSteeg][RFC6814][1]
1 0 16 144 IMITD - IMI Traffic Descriptor [Lee]
1 0 17 145 EIP - Extended Internet Protocol [RFC1385][RFC6814][1]
0 2 18 82 TR - Traceroute [RFC1393][RFC6814][1]
1 0 19 147 ADDEXT - Address Extension [Ullmann IPv7][RFC6814][1]
1 0 20 148 RTRALT - Router Alert [RFC2113]
1 0 21 149 SDB - Selective Directed Broadcast [Charles_Bud_Graff][RFC6814][1]
1 0 22 150 - Unassigned (Released 18 October 2005)
1 0 23 151 DPS - Dynamic Packet State [Andy_Malis][RFC6814][1]
1 0 24 152 UMP - Upstream Multicast Pkt. [Dino_Farinacci][RFC6814][1]
0 0 25 25 QS - Quick-Start [RFC4782]
0 0 30 30 EXP - RFC3692-style Experiment [2] [RFC4727]
0 2 30 94 EXP - RFC3692-style Experiment [2] [RFC4727]
1 0 30 158 EXP - RFC3692-style Experiment [2] [RFC4727]
1 2 30 222 EXP - RFC3692-style Experiment [2] [RFC4727]

IPv4 Router Alert Option Values

Registration Procedure(s)

IETF Review

Reference

[RFC5350]

Available Formats

CSV

Value Description Reference
0 Router shall examine packet [RFC2113]
1-32 Aggregated Reservation Nesting Level [RFC3175]
33-64 QoS NSLP Aggregation Levels 0-31 [RFC5974]
65 NSIS NATFW NSLP [RFC5973]
66-65502 Unassigned
65503-65534 Reserved for experimental use [RFC5350]
65535 Reserved [RFC5350]

IP Time to Live Parameter

Registration Procedure(s)

Not defined

Note

The current recommended default time to live (TTL) for the Internet Protocol (IP) is 64 [RFC791][RFC1122].

IP TOS Parameters

Registration Procedure(s)

Registrations no longer accepted

Note

This registry was deprecated following the publication of [RFC2474].

Type-of-Service Values

Registration Procedure(s)

Registrations no longer accepted

Note

This registry was deprecated following the publication of [RFC2474].

Contact Information

ID Name Contact URI Last Updated
[Andy_Malis] Andy Malis mailto:agmalis&gmail.com 2013-05-28
[Charles_Bud_Graff] Charles "Bud" Graff mailto:bud&fotlan.army.mil 1995-03
[Deborah_Estrin] Deborah Estrin mailto:Estrin&usc.edu 1994-10
[Dino_Farinacci] Dino Farinacci mailto:dino&cisco.com 1999-05
[Greg_Finn] Greg Finn mailto:Finn&isi.edu 1994-10
[Jon_Postel] Jon Postel mailto:postel&isi.edu 1994-10

Footnotes

[1] obsoleted IP Option Number
[2] It is only appropriate to use these values in explicitly-configured experiments; they MUST NOT be shipped as defaults in implementations. See RFC 3692 for details.