AS639

AS639 falls within a DoD-administered ASN block registered to ARIN as DNIC-ASBLK-00616-00665, spanning AS616 through AS665; there is no individual per-ASN RDAP record for AS639 alone, so its registry data is read from the block-level autnum object that covers it. That top-level record carries a registration event dated 1990-04-19 and a last-changed event dated 2025-09-12, both first-party ARIN facts that are distinct from the entity-level (POC/org) dates nested inside the same record — MIL-HSTMST-ARIN (registered 1993-05-26), REGIS10-ARIN (registered 2009-06-24), and the USDDD registrant org (registered 2007-01-12) — none of which should be mistaken for the block's own allocation date. The registrant of record is the United States Department of Defense, with technical and administrative contacts routed through DISA-Columbus. Operationally, AS639 shows zero footprint: RIPEstat reports zero announced IPv4/IPv6 prefixes and zero visibility across all RIS peers (0 of 326 v4 peers, 0 of 321 v6 peers), and CAIDA AS Rank places it at rank 79,459 with a customer cone consisting of only itself (0 prefixes, 0 addresses) and zero AS degree in every direction. No PeeringDB record exists for AS639, no public peering policy was found, and no abuse, security-incident, or community-discussion signal surfaced in NANOG, Reddit, or general threat-feed searches — consistent with a legacy, currently-unannounced federal block rather than an actively operated network.

Operator

United States Department of Defense (DoD) [Confirmed] — https://rdap.arin.net/registry/autnum/639

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/639

Allocated

1990-04-19 (ARIN top-level autnum registration event for the containing block — a first-party RIR fact, not an entity/POC date); last changed 2025-09-12 [Confirmed] — https://rdap.arin.net/registry/autnum/639

Org status

RDAP status "active" but currently unannounced in global BGP — 0 IPv4/IPv6 prefixes, 0 RIS peers seeing it (0/326 v4, 0/321 v6) [Confirmed] — https://stat.ripe.net/AS639

Website

no AS639-specific official page found; disa.mil carries no DNIC/ASN-specific content, and the historical nic.mil page is defunct (archive-only) [Likely] — https://www.disa.mil

IANA Reference

left blank — no RFC association found [Unknown]

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-17 — not in NANOG archives or general threat-feed/spam/malware searches; consistent with an unrouted, dormant block

Network & routing

Network type

U.S. federal/military government address block, non-commercial, not a transit/ISP network [Confirmed] — https://rdap.arin.net/registry/autnum/639

Routing footprint

CAIDA AS rank 79,459; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses; AS degree 0/0/0 (customer/peer/provider); not observed in CAIDA's topology (seen: false) [Confirmed] — https://asrank.caida.org/asns/639

RPKI

not assessable — no announced prefixes exist to validate against ROAs [Unknown] — https://stat.ripe.net/AS639

Peering policy

none published; no PeeringDB record exists for AS639 (404) [Confirmed-null] — https://www.peeringdb.com/asn/639

Registry block

DNIC-ASBLK-00616-00665 (AS616–AS665); no individual RDAP autnum record exists for AS639 alone [Confirmed] — https://rdap.arin.net/registry/autnum/639

Community corroboration

none found — no NANOG or Reddit discussion specific to AS639; expected for a non-public-facing government block [Likely] — https://www.reddit.com/r/networking/

Analyst note

AS639 has no individual ARIN RDAP record; it falls inside DNIC-ASBLK-00616-00665 (AS616–AS665), a DoD-administered block. The allocated_date is read from the block's top-level RDAP registration event (1990-04-19), never from the nested entity/POC dates. Zero routing footprint across RIPEstat and CAIDA.