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
| Copy | Class | Number | Value | Name | Reference |
|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | EOOL - End of Options List |
RFC 791; Jon Postel |
| 0 | 0 | 1 | 1 | NOP - No Operation |
RFC 791; Jon Postel |
| 1 | 0 | 2 | 130 | SEC - Security |
RFC 1108 |
| 1 | 0 | 3 | 131 | LSR - Loose Source Route |
RFC 791; Jon Postel |
| 0 | 2 | 4 | 68 | TS - Time Stamp |
RFC 791; Jon Postel |
| 1 | 0 | 5 | 133 | E-SEC - Extended Security |
RFC 1108 |
| 1 | 0 | 6 | 134 | CIPSO - Commercial Security |
draft-ietf-cipso-ipsecurity-01 |
| 0 | 0 | 7 | 7 | RR - Record Route |
RFC 791; Jon Postel |
| 1 | 0 | 8 | 136 | SID - Stream ID |
RFC 791; Jon Postel; RFC 6814[1] |
| 1 | 0 | 9 | 137 | SSR - Strict Source Route |
RFC 791; Jon Postel |
| 0 | 0 | 10 | 10 | ZSU - Experimental Measurement |
ZSu |
| 0 | 0 | 11 | 11 | MTUP - MTU Probe |
RFC 1063; RFC 1191[1] |
| 0 | 0 | 12 | 12 | MTUR - MTU Reply |
RFC 1063; RFC 1191[1] |
| 1 | 2 | 13 | 205 | FINN - Experimental Flow Control |
Greg Finn |
| 1 | 0 | 14 | 142 | VISA - Experimental Access Control |
Deborah Estrin; RFC 6814[1] |
| 0 | 0 | 15 | 15 | ENCODE - ??? |
VerSteeg; RFC 6814[1] |
| 1 | 0 | 16 | 144 | IMITD - IMI Traffic Descriptor |
Lee |
| 1 | 0 | 17 | 145 | EIP - Extended Internet Protocol |
RFC 1385; RFC 6814[1] |
| 0 | 2 | 18 | 82 | TR - Traceroute |
RFC 1393; RFC 6814[1] |
| 1 | 0 | 19 | 147 | ADDEXT - Address Extension |
Ullmann IPv7; RFC 6814[1] |
| 1 | 0 | 20 | 148 | RTRALT - Router Alert |
RFC 2113 |
| 1 | 0 | 21 | 149 | SDB - Selective Directed Broadcast |
Charles "Bud" Graff; RFC 6814[1] |
| 1 | 0 | 22 | 150 | - Unassigned (Released 18 October 2005) |
|
| 1 | 0 | 23 | 151 | DPS - Dynamic Packet State |
Andy Malis; RFC 6814[1] |
| 1 | 0 | 24 | 152 | UMP - Upstream Multicast Pkt. |
Dino Farinacci; RFC 6814[1] |
| 0 | 0 | 25 | 25 | QS - Quick-Start |
RFC 4782 |
| 0 | 0 | 30 | 30 | EXP - RFC3692-style Experiment [2] |
RFC 4727 |
| 0 | 2 | 30 | 94 | EXP - RFC3692-style Experiment [2] |
RFC 4727 |
| 1 | 0 | 30 | 158 | EXP - RFC3692-style Experiment [2] |
RFC 4727 |
| 1 | 2 | 30 | 222 | EXP - RFC3692-style Experiment [2] |
RFC 4727 |
IPv4 Router Alert Option Values
Registration Procedure(s)
- IETF Review
Reference
- RFC 5350: IANA Considerations for the IPv4 and IPv6 Router Alert Options
Available Formats
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 RFC 791; RFC 1122.
IP TOS Parameters
Registration Procedure(s)
- Registrations no longer accepted
Note
This registry was deprecated following the publication of RFC 2474.
Type-of-Service Values
Registration Procedure(s)
- Registrations no longer accepted
Note
This registry was deprecated following the publication of RFC 2474.
Contact Information
| Name | Contact URI | Last Updated |
|---|---|---|
| Andy Malis | agmalis&gmail.com | 2013-05-28 |
| Charles "Bud" Graff | bud&fotlan.army.mil | 1995-03 |
| Deborah Estrin | Estrin&usc.edu | 1994-10 |
| Dino Farinacci | dino&cisco.com | 1999-05 |
| Greg Finn | Finn&isi.edu | 1994-10 |
| Jon Postel | postel&isi.edu | 1994-10 |