AS264

AS264 is a legacy two-digit-era autonomous system number registered under ARIN to SRI International, the independent nonprofit research-and-development institute in Menlo Park, California (founded in 1946 as Stanford Research Institute, independent from Stanford since 1970). The number carries unusual historical weight: SRI was the second node ever connected to the ARPANET — the first host-to-host packet was sent to SRI on 1969-10-29 — and SRI ran the Network Information Center (NIC) that maintained the ARPANET host tables and early DNS until 1991. AS264 (SRINET-AS) is SRI's own corporate research network, not a commercial ISP; IPinfo classifies it as Education and it carries no downstream customers. It is a low-degree stub: RIPEstat sees only two observed BGP neighbours and full RIS visibility (327/327 peers) for its IPv4 routes, while announcing zero IPv6. The network announces roughly 37 IPv4 prefixes totalling about 75,008 addresses, anchored by the pre-CIDR /16 at 128.18.0.0/16 plus a scatter of 128.57.x and 192.x /24s consistent with an early-Internet institution. Upstream transit is provided by Cogent (AS174) and Zayo (AS6461). The only flagged technical issues are routing-hygiene gaps reported by Hurricane Electric — bogon announcements, IRR origin mismatch on two prefixes, and no published RPKI ROAs — which are common deficiencies for older institutional networks, not abuse or threat indicators. No notable public abuse signal was found as of June 2026: AS264 is absent from Spamhaus ASN-DROP, shows zero spam-active IPs on CleanTalk, and appears in no queried threat feed, consistent with a clean legacy R&D network.

Operator

SRI International (independent nonprofit R&D institute, formerly Stanford Research Institute; ARIN org handle SRIINT-Z) [Confirmed] — ARIN RDAP, sri.com/about, en.wikipedia.org/wiki/SRI_International

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum (rdap.arin.net/registry/autnum/264)

Allocated

1989-01-23 (ARIN registry date from the autnum top-level registration event, NOT an IEEE date — IEEE publishes no ASN dates); last changed 2025-12-01 [Confirmed] — ARIN RDAP autnum top-level events (confirmed by A2, A3, A4)

AS name / handle

SRINET-AS [Confirmed] — ARIN RDAP, ipinfo.io/AS264

Org status

active independent nonprofit R&D corporation; founded 1946, independent from Stanford since 1970; acquired Sarnoff Corp. (1987) and PARC (2023); ~1,500–2,100 employees [Confirmed] — sri.com/about, en.wikipedia.org/wiki/SRI_International

Contacts

named POCs John Tomasetti (TOMAS90-ARIN), Mark Favis (MAMF-ARIN), and Raymond McCallus (additionally returned by the abuse-finder); role contact "Manager, Network Systems" (MNS19-ARIN). The individuals' personal @sri.com mailboxes are withheld here — consult the ARIN RDAP record directly

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

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-21 — not in Spamhaus ASN-DROP, CleanTalk (0 spam-active IPs across the prefix space), or any queried threat feed; Hurricane Electric flags routing-hygiene gaps only (bogon announcements, IRR origin mismatch on 192.12.5.0/24 and 192.12.16.0/24, zero RPKI ROAs) [Confirmed for Spamhaus/CleanTalk/HE; Likely for AbuseIPDB/NANOG/threat-feed absence, which were search-inferred] — spamhaus.org/drop/asndrop.json, cleantalk.org/blacklists/as264, bgp.he.net/AS264

Network & routing

Network type

enterprise/research stub network (SRI's own corporate R&D network; IPinfo classifies as Education); not a commercial ISP, no downstream customers [Confirmed] — ipinfo.io/AS264, whois.ipinsight.io/AS264

Size

~37 announced IPv4 prefixes / ~75,008 IPv4 addresses (anchored by 128.18.0.0/16 plus a /23 at 128.57.128.0/23 and a set of 128.57.x and 192.x /24s); 0 IPv6 prefixes announced [Confirmed] — RIPEstat routing-status / announced-prefixes (resource=264), ipinfo.io/AS264

Routing/peering

low-degree stub — RIPEstat reports 2 observed BGP neighbours and full IPv4 RIS visibility (327/327 v4 peers; 0/322 v6); upstream transit via AS174 (Cogent) and AS6461 (Zayo), with AS1239 (Cogent) also seen as a peer [Confirmed for upstreams/peers via ipinfo; neighbour count Confirmed via RIPEstat]. RIPEstat did not enumerate the two neighbours and CAIDA AS-rank returned HTTP 502, so AS-rank and customer cone are Unknown

Peering policy

Unknown — no PeeringDB record exists for AS264 (peeringdb.com/asn/264 returns 404) and no public peering-policy page was found on sri.com [Unknown] — A2/A5 (no source)

RPKI

no ROAs published (zero RPKI ROA coverage) per Hurricane Electric; per-prefix RPKI validation not separately performed [Confirmed for zero-ROA via bgp.he.net] — bgp.he.net/AS264

Notable usage

SRI was the second ARPANET node (first packet received 1969-10-29), ran the ARPANET Network Information Center / early DNS under Elizabeth Feinler until 1991, and originated the first three-network internetwork connection on 1977-11-22. AS264 (SRINET-AS) is SRI's current corporate research network

[Confirmed] — en.wikipedia.org/wiki/SRI_International, sri.com/hoi/arpanet, sri.com/about

Geo footprint

United States — HQ 333 Ravenswood Avenue, Menlo Park, CA 94025 (RDAP registrant address); a technical/abuse contact also lists 201 Washington Road, Princeton, NJ [Confirmed for HQ; Likely for multi-site footprint] — ARIN RDAP

Community signal

no AS264-specific discussion found in NANOG/MARC/SecLists archives, Reddit networking communities, or public reputation databases as of 2026-06-21 [Unknown — honest null, not refutation] — A5 community angle

Analyst note

One of the earliest ASNs, tied to a foundational ARPANET institution. The entity-level RDAP dates (2023-10-30, 2025-04-08, 2025-04-10) are contact/org record updates and were treated as decoys; allocated_date comes from the autnum top-level registration event (1989-01-23), corroborated by three angles.