AS628

AS628 is a legacy autonomous system number that falls inside a single contiguous ARIN block, DNIC-ASBLK-00616-00665 (AS616 through AS665), registered as one autnum object to the United States Department of Defense under org handle USDDD. Unlike most modern ASNs, ARIN does not expose an AS628-specific registration record — the RDAP query for autnum/628 returns the shared block object, whose top-level registration event dates to 1990-04-19, with a last-changed timestamp of 2025-09-12. Every routing-data source consulted (RIPEstat as-overview, RIPEstat routing-status, CAIDA ASN Rank, and bgp.he.net) agrees that AS628 is currently dark: zero announced IPv4 prefixes, zero announced IPv6 prefixes, zero of 326 RIS peers seeing it on v4 and zero of 322 on v6, zero observed BGP neighbours, and a singleton customer cone (the ASN itself, 0 prefixes, 0 addresses). Its CAIDA AS rank of 79,459 sits at the bottom of the global ranking, consistent with a reserved, non-publicly-routed government ASN rather than an operational network. No PeeringDB record exists for AS628, and no public abuse, threat-intel, or NANOG-community signal names it specifically — expected for a non-routed military block, not a research gap. The registrant's operational contacts (DISA-Columbus, Whitehall, OH) are Confirmed via first-party RDAP entity records.

Operator / Org

United States Department of Defense (DoD), org handle USDDD; block name DNIC-ASBLK-00616-00665 (AS616–AS665) [Confirmed] — ARIN RDAP autnum/628

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder (authoritative_rir: arin)

Allocated

1990-04-19 — ARIN RDAP top-level autnum registration event for the DNIC-ASBLK-00616-00665 block covering AS628 (this is a block-level, not AS628-individual, registration, but is the only registry-facing registration date available and is recorded per project rule that RIR top-level events are first-party facts); last changed 2025-09-12

[Confirmed] — https://rdap.arin.net/registry/autnum/628

Org status

Active (per ARIN RDAP autnum status field) [Confirmed] — ARIN RDAP autnum/628

Contacts

abuse/NOC/technical — disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (MIL-HSTMST-ARIN); administrative/technical — disa.columbus.ns.mbx.arin-registrations@mail.mil (REGIS10-ARIN); both DISA-Columbus, 300 North James Road, Whitehall, OH 43213 [Confirmed] — ARIN RDAP autnum/628

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-17 — not surfaced in Spamhaus resource-hub searches or general ASN-abuse advisories; zero announced prefixes limit any live routed attack surface

Network & routing

Network type

government/military; legacy DoD "DNIC" ASN block; currently unannounced/dark, not a live operational network [Confirmed] — RIPEstat routing-status, bgp.he.net

Size

dormant — 0 IPv4 prefixes/addresses, 0 IPv6 prefixes; customer cone = singleton (1 ASN, 0 prefixes, 0 addresses) [Confirmed] — RIPEstat routing-status, CAIDA ASN Rank

Routing/peering

NOT announced — 0/326 RIS peers seeing it on v4, 0/322 on v6; CAIDA AS degree total 0 (customer 0, peer 0, provider 0); no PeeringDB record found [Confirmed] — RIPEstat routing-status, https://bgp.he.net/AS628

RPKI

not assessable — no announced prefixes, so no ROAs to validate [Confirmed/Unknown] — RIPEstat rpki-validation (skipped, no prefix)

Notable usage

Unknown — no sourced evidence attributes a specific named DoD network or facility to AS628 individually; the block is administratively tied to DISA-Columbus [Unknown]

Related ASNs

contiguous block AS616–AS665 (DNIC-ASBLK-00616-00665), all registered to the same DoD org [Confirmed] — ARIN RDAP autnum/628

ASN

AS628 [Confirmed] — https://rdap.arin.net/registry/autnum/628

Analyst note

RDAP for AS628 returns a shared block object (AS616–AS665), not an AS628-specific autnum record; the 1990-04-19 registration event is the block's, recorded here as allocated_date per the RIR-first-party-fact rule rather than nulled. A community-research angle (A5) returned findings (operator "Navy Network Information Center", designation "PENS-NET-AS", citing ipinfo.io/AS84) that do not match AS628's RDAP identity and cite a different ASN (AS84); those claims are excluded as a likely angle/entity mismatch rather than treated as corroboration or refutation.