Internet Assigned Numbers Authority Security Parameters Index (SPI) Parameters Last Updated 2010-04-28 Available Formats [IMG] XML [IMG] HTML [IMG] Plain text Registry included below * Security Parameters Index (SPI) Security Parameters Index (SPI) Registration Procedure(s) RFC Required Reference [RFC1826][RFC2402][RFC2406][RFC4302][RFC4303] Note The Security Parameters Index is a 32-bit number used to identify the security association of a datagram in certain security procedures [RFC1826][RFC1827]. The first 256 SPI values are assigned by the IANA and listed here. Available Formats [IMG] CSV Number Description Reference 0 Reserved - Used to indicate that no security association has been established [RFC4302][RFC4303] 1 SKIP [Tom_Markson] 2 WESP [RFC5840] 3-255 Unassigned Contact Information ID Name Contact URI Last Updated [Tom_Markson] Tom Markson mailto:markson&osmosys.incog.com 1995-08 Licensing Terms