AS152

AS152 is an early ARIN Autonomous System Number registered to SRI International, the independent nonprofit research institute headquartered at 333 Ravenswood Avenue, Menlo Park, California. SRI carries unusual historical weight on the Internet: it was one of the original four ARPANET nodes and on 29 October 1969 received the first ARPANET transmission from UCLA, and it subsequently operated the Network Information Center (NIC) — the early host-table, directory, and naming registry that was foundational to what became DNS — into the early 1990s. The ASN itself is best described as dormant in modern routing terms. As of June 2026 it announces zero IPv4 prefixes, zero IPv6 prefixes, and shows zero observed BGP peers, zero upstream transit providers, and zero downstream customers across every routing data source checked (bgp.he.net, bgp.tools, ipinfo.io). It does not appear in the global routing table and has no PeeringDB record (returns 404). The registration is, however, actively maintained: ARIN RDAP shows the SRI International org entity (handle SRIINT-Z) last changed 2025-12-01, with validated technical/abuse contacts updated in April 2025 (John Tomasetti, TOMAS90-ARIN; Mark Anthony Medrano Favis, MAMF-ARIN — both @sri.com). Note the date nuance: ARIN/ipinfo report the ASN allocation as 1988-01-04, while the RDAP org-handle dates (registered 2023-10-30, last changed 2025-12-01) reflect later registry-record refreshes, not the original allocation. SRI International also holds a separate ASN, AS36, which may be its operationally relevant number. No public abuse signal, blocklist entry, or routing-security incident was found in any open threat feed as of 2026-06-15 — consistent with an ASN that originates no routable address space and therefore presents no active traffic surface to classify. This is best characterized as a clean, dormant, actively-maintained legacy research-institution ASN.

Operator

SRI International (independent nonprofit research and development institute), 333 Ravenswood Avenue, Menlo Park, CA 94025, United States; ARIN OrgId SRIINT-Z [Confirmed] — ARIN RDAP (https://rdap.arin.net/registry/autnum/152); sri.com/about

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP; ipinfo.io/AS152

AS name

SRI-ACCATT-AS [Confirmed] — ipinfo.io/AS152; ip2location.com/as152

Allocated

ARIN ASN RegDate 1988-01-04 (per ARIN/ipinfo). RDAP org handle SRIINT-Z shows registration 2023-10-30 and last changed 2025-12-01 — later registry-record refreshes, NOT the original allocation [Confirmed for the ARIN/ipinfo RegDate and the RDAP refresh dates; the original 1988 allocation is corroborated by ipinfo but tagged [Likely] for exact day] — ipinfo.io/AS152; rdap.arin.net/registry/autnum/152

Org status

active holder — SRI International, an independent nonprofit research institute (founded 1946 as Stanford Research Institute; became independent of Stanford University in 1970). Registration actively maintained (org entity last changed 2025-12-01; validated contacts) despite no routing activity

[Confirmed] — sri.com/about; rdap.arin.net/registry/autnum/152; en.wikipedia.org/wiki/SRI_International

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-15; no Spamhaus ASN-DROP entry, no CleanTalk spam volume, no AbuseIPDB reports, no NANOG routing-incident discussion — a dormant ASN with 0 prefixes has no traffic surface to classify

Network & routing

Network type

research-institution / nonprofit R&D network (legacy); not a commercial ISP; currently inactive [Confirmed] — ARIN RDAP registrant; bgp.he.net/AS152

Size / routing

0 IPv4 prefixes, 0 IPv6 prefixes, 0 addresses announced; not present in the global routing table [Confirmed] — bgp.he.net/AS152; bgp.tools/as/152; ipinfo.io/AS152

Peering / transit

no upstreams, no peers, no customers; customer cone not applicable (inactive) [Confirmed] — bgp.he.net/AS152; bgp.tools/as/152; ipinfo.io/AS152

Peering policy

no PeeringDB record (peeringdb.com/asn/152 → 404); no published policy on sri.com [Confirmed for absence] — peeringdb.com/asn/152; bgp.he.net/AS152

RPKI

indeterminate — no prefixes announced, so no ROAs to validate; bgp.he.net shows 0 valid and 0 invalid originated prefixes [Confirmed for null] — bgp.he.net/AS152

AS rank

Unknown — no rank assigned; ASN is inactive / not in the global routing table [Confirmed for absence] — bgp.he.net/AS152; bgp.tools/as/152

Notable usage

SRI was one of the original four ARPANET nodes and received the first ARPANET transmission from UCLA on 1969-10-29; it operated the Network Information Center (NIC) — early host tables, directory, and naming services foundational to DNS — into the early 1990s. The ASN today is dormant with no announced prefixes [Confirmed for the ARPANET/NIC history and for current inactivity] — sri.com/hoi/arpanet/; sri.com/hoi/domain-names-the-network-information-center/; ethw.org/Milestones:Inception_of_the_ARPANET,_1969; bgp.he.net/AS152

Related ASNs

AS36 (also registered to SRI International; may be the operationally active ASN) [Likely] — bgp.he.net/AS36

Technical/abuse contacts

John Tomasetti (TOMAS90-ARIN; roles admin/technical/abuse/routing/dns/noc) and Mark Anthony Medrano Favis (MAMF-ARIN; roles technical/abuse/routing/dns) — both on the sri.com domain and both ARIN-validated; their individual mailboxes and direct lines are in the ARIN RDAP record; records last changed April 2025

[Confirmed] — rdap.arin.net/registry/autnum/152

Community mentions

none found in NANOG archives or Reddit r/networking in a routing-incident or operator context [Unknown] — archive.nanog.org; seclists.org/nanog

Analyst note

clean, dormant legacy research-institution ASN with strong ARPANET/NIC heritage; registration actively maintained but no routable footprint and no abuse history. WHOIS resolves to SRI International, not a carrier.