AS64

AS64 is a legacy allocation registered under ARIN to The MITRE Corporation (org THEMIT-1, Bedford, MA), and it is MITRE's second ASN — RFC 1020 (1987) lists it as "MITRE-B-AS," and the modern ASName is MITRE-AS-2. MITRE operates AS35 (MITRE-AS-1) and AS5691 under the same THEMIT-1 org; MITRE was founded in Bedford, Massachusetts in 1958, spun off from MIT Lincoln Laboratory when Robert Everett and 485 other Lincoln Lab employees (from Division 6, which developed SAGE) transferred to the new nonprofit, incorporated July 21, 1958. The key triage point is that AS64 is dormant: it has not been visible in the global routing table since June 11, 2020, originates zero prefixes, and PeeringDB lists it with 0 IPv4 / 0 IPv6 (the last observed peer was Lumen/Level 3, AS3356). MITRE's actively routed networks live under AS35/AS5691. The ARIN ASN RegDate is 1986-03-04 (the THEMIT-1 org RegDate is 1985-09-04). For triage, treat AS64 as a registered-but-dormant FFRDC number; an origin in live BGP would be anomalous. No notable public abuse signal was found as of June 2026.

Operator

The MITRE Corporation (ARIN OrgId THEMIT-1, Bedford, MA) [Confirmed] — ARIN RDAP

Country / RIR

US, ARIN [Confirmed]

Allocated

ARIN ASN RegDate 1986-03-04 (updated 2022-10-21; org THEMIT-1 RegDate 1985-09-04) [Confirmed]

Org status

legacy/dormant

Security/abuse context (NEUTRAL, DATED)

dormant/not announcing; no abuse signal as of 2026-06-08 — bgp.he.net

Network & routing

Network type

FFRDC / research-defense [Confirmed]

Size

dormant — 0 prefixes originated/announced (not visible since 2020-06-11) — bgp.he.net (2026-06)

Routing/peering

none — 0 prefixes; PeeringDB lists 0 IPv4 / 0 IPv6; last observed peer Lumen AS3356; RPKI n/a — bgp.he.net, peeringdb.com

Notable usage

[historical, RFC 1020] AS64 "MITRE-B-AS"; modern ASName MITRE-AS-2 — MITRE's second ASN. MITRE (founded Bedford, MA, 1958; spun off from MIT Lincoln Laboratory's SAGE Division 6) — mitre.org

Related ASNs

AS35 (MITRE-AS-1), AS5691 (The MITRE Corporation) — both under THEMIT-1, actively routed [Confirmed]

Analyst note

A registered-but-dormant FFRDC number (dark since 2020-06-11); MITRE's live networks are on AS35/AS5691. An AS64 origin in live BGP would be anomalous.