AS304

AS304 is a legacy two-byte autonomous system number registered under ARIN to SRI International — the Menlo Park, California nonprofit research-and-development institute that began in 1946 as the Stanford Research Institute and became independent of Stanford University in 1970. The ASN sits inside the very low (1–1876) 16-bit range that ARIN administers, and its holder carries deep historical weight in Internet history: SRI hosted the second ARPANET node in 1969, ran the Network Information Center (NIC) that maintained the early host table and DNS registry, and took part in the 1977 multi-network internetworking demonstration. The AS name SRIEXPRIGNET-AS most plausibly denotes an SRI "experimental routing IGP network," consistent with the institute's early-Internet research role, though no current first-party document on sri.com names that network. The key triage point is that AS304 is effectively dormant today: RIPEstat as-overview reports it as not announced, routing-status shows zero IPv4 and zero IPv6 prefixes with zero RIS peers seeing it, and bgp.he.net / bgp.tools agree it carries no presence in the global routing table as of June 2026. CAIDA timed out, so AS rank and customer cone could not be measured; RPKI posture is not assessable without an active origination. No notable public abuse signal was found — AS304 is absent from Spamhaus ASN-DROP and surfaced no NANOG, threat-intel, or hijack reports — consistent with a clean, dormant ASN held by a respected R&E institution.

Operator

SRI International (independent nonprofit R&D institute; ARIN org handle SRIINT-Z; 333 Ravenswood Avenue, Menlo Park, CA 94025, US) [Confirmed] — ARIN RDAP autnum/304, sri.com/about

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/304, RIPEstat as-overview (resource 304)

Allocated

1989-06-27 (ARIN RDAP autnum TOP-LEVEL registration event — a first-party RIR fact, not an IEEE date; IEEE publishes no ASN registration dates); last changed 2025-12-01 [Confirmed] — ARIN RDAP autnum/304 top-level events. (bgpview.io reports 1989-06-26, a one-day timezone-offset variant of the same registration; treat 1989-06-27 from ARIN RDAP as authoritative.)

AS name

SRIEXPRIGNET-AS [Confirmed] — ARIN RDAP autnum/304, whois.arin.net/rest/asn/AS304

Org status

active independent nonprofit R&D institute (SRI International), founded 1946 as Stanford Research Institute, independent from Stanford University since 1970 [Confirmed] — en.wikipedia.org/wiki/SRI_International, sri.com/about

Contacts

the abuse, technical/administrative, and NOC roles (the last held by SRI's Manager, Network Systems) are all filled by named individual SRI staff POCs rather than role mailboxes; their personal addresses are not reproduced here. Registrant HQ 333 Ravenswood Avenue, Menlo Park, CA 94025

[Confirmed] — ARIN RDAP autnum/304, RIPEstat abuse-contact-finder

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-28 — absent from Spamhaus ASN-DROP; no threat-intel, NANOG, or BGP-hijack reports for AS304/SRIEXPRIGNET-AS; dormant ASN under a respected R&E operator

Network & routing

Network type

enterprise / research-institution network; AS304 is legacy and currently inactive in BGP [Confirmed] — bgp.tools/as/304, RIPEstat routing-status

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes [Confirmed] — RIPEstat routing-status (resource 304), bgp.he.net/AS304

Routing/peering

NOT announced — announced=false; 0 RIS peers seeing it (0/323 v4, 0/321 v6); 0 observed neighbours/upstreams [Confirmed] — RIPEstat as-overview & routing-status. No PeeringDB record (AS304 returns 404), so peering policy is Unknown [Unknown]

RPKI

not assessable — AS304 announces no prefixes, so there are no ROAs to validate [Unknown] — RIPEstat routing-status (no active origination)

AS rank / customer cone

Unknown — CAIDA AS Rank fetch timed out [Unknown]

Notable usage

SRI hosted the second ARPANET node (1969) and the Network Information Center (NIC); participated in the 1977 multi-network internetworking demo. AS304 was registered in 1989 during the ARPANET-to-Internet transition; SRIEXPRIGNET likely denotes an experimental SRI research/IGP network

[Likely] — en.wikipedia.org/wiki/SRI_International, sri.com/hoi/internetworking, RFC 1166 (DDN NIC at SRI)

Analyst note

Dormant legacy ASN registered to a historically significant R&E operator; WHOIS resolves to SRI International but the AS announces nothing. The RDAP entity-level dates (TOMAS90 2025-04-10, MAMF 2025-04-08, SRIINT-Z org 2023-10-30) are contact/org record events, not the allocation — the autnum top-level registration (1989-06-27) is the allocated_date.