AS625

AS625 is a legacy autonomous system number registered under ARIN as part of the block delegation DNIC-ASBLK-00616-00665 (AS616 through AS665), assigned to the United States Department of Defense (organization handle USDDD). There is no separate per-ASN RDAP object; AS625 resolves to the same block-level autnum record, with administrative and technical points of contact at DISA-Columbus (Defense Information Systems Agency, Columbus, OH) and a registrant address of 3990 E. Broad Street, Columbus, OH. The ASN is a DNIC (Defense Network Information Center) legacy military allocation rather than a commercial ISP or content network, and it carries no PeeringDB listing and no published peering policy. Routing-wise, AS625 is dormant: it announces zero IPv4 and zero IPv6 prefixes today, and historical BGP data shows it was last visible in the global table on 2011-11-18, originating a single prefix (138.147.0.0/16, associated with Navy Network Information Center space) with one historical peer, AS27064 (DoD Network Information Center). CAIDA ranks it near the bottom of the global AS hierarchy with a singleton customer cone and zero degree in every category. No public abuse or reputation signal was found for this ASN.

Operator

United States Department of Defense (DoD), ARIN org handle USDDD; block DNIC-ASBLK-00616-00665 (AS616–AS665), admin/tech POC DISA-Columbus [Confirmed] — https://rdap.arin.net/registry/autnum/625

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/625 ; https://stat.ripe.net/AS625

Allocated

1990-04-19 — ARIN RDAP autnum TOP-LEVEL registration event (distinct from the nested entity/contact-record dates of 2007/2009, which are administrative POC dates, not the allocation date); last changed 2025-09-12 [Confirmed] — https://rdap.arin.net/registry/autnum/625

Org status

active per ARIN RDAP (status: active on the containing block record) [Confirmed] — https://rdap.arin.net/registry/autnum/625

Contacts

abuse/hostmaster disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil; registrations disa.columbus.ns.mbx.arin-registrations@mail.mil [Confirmed] — https://rdap.arin.net/registry/autnum/625

Website

no dedicated operator website, About page, or peering-policy page found for AS625 specifically; a WebFetch of disa.mil returned an unrelated placeholder, treated as inconclusive tooling artifact rather than confirmed absence [Unknown]

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-17; convergent WebSearch across abuse feeds and NANOG archives found nothing, though a direct URLhaus query was blocked by bot detection so this is search-based rather than an exhaustively confirmed database null

Network & routing

Network type

U.S. federal government / military legacy DNIC block, not a commercial or transit network [Confirmed] — https://rdap.arin.net/registry/autnum/625 ; https://asrank.caida.org/asns/625/as-core

Size

dormant — 0 IPv4 prefixes / 0 addresses, 0 IPv6 prefixes announced today; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — https://stat.ripe.net/AS625 ; https://asrank.caida.org/asns/625/as-core

Routing/peering

not currently announced — 0/326 RIS peers see v4, 0/322 see v6; CAIDA degree total 0 (customer 0, peer 0, provider 0); no PeeringDB listing (404) [Confirmed] — https://stat.ripe.net/AS625 ; https://www.peeringdb.com/asn/625

Historical routing

first seen 164.191.0.0/16 on 2000-08-18; last seen 138.147.0.0/16 on 2011-11-18; bgp.he.net independently confirms "not visible in the global routing table since November 01, 2011" with one historical peer, AS27064 (DoD Network Information Center)

[Confirmed] — https://stat.ripe.net/AS625 ; https://bgp.he.net/AS625

RPKI

not assessable — no currently announced prefixes, so RIPEstat's rpki-validation call requires a prefix and was skipped [Confirmed] — https://stat.ripe.net/AS625

Notable usage

legacy DNIC (Defense Network Information Center) block reserved for DoD (AS616–AS665); AS625 itself is administrative/unrouted rather than an operationally active network today [Confirmed] — https://rdap.arin.net/registry/autnum/625

Related ASNs

part of the DNIC-ASBLK-00616-00665 sibling range (AS616–AS665); historical BGP peer AS27064 (DoD Network Information Center) [Confirmed] — https://rdap.arin.net/registry/autnum/625 ; https://bgp.he.net/AS625

Analyst note

encountered as a long-dormant DoD/DNIC legacy ASN, unrouted since November 2011, sitting inside the AS616–AS665 block administered on the Department of Defense's behalf; no abuse signal, no PeeringDB presence, no live routing.