AS532

AS532 is a legacy ASN in the DNIC (Defense Network Information Center) series, registered with ARIN to the United States Department of Defense (org handle USDDD) with administrative and technical contacts routed through DISA-Columbus in Whitehall, Ohio. The autnum's top-level ARIN RDAP registration event dates to 1989-09-29, with the object's most recent metadata change on 2025-09-12. Historically, AS532 originated three IPv4 blocks in the 139.77.0.0/16 range — 139.77.6.0/24, 139.77.8.0/24, and 139.77.12.0/24 — but RIPEstat routing-status shows the last observed announcement (139.77.8.0/24) ending 2026-03-17, and as of the 2026-07-11 query none of RIPE RIS's 325 IPv4 or 322 IPv6 peers see any route from it: the ASN has gone dark from the global BGP table over the preceding roughly four months. CAIDA AS Rank corroborates this with a customer cone of one (itself), zero AS-degree in every direction, and no clique membership. There is no PeeringDB record for AS532, and as an internal DoD network its external connectivity, where it exists, runs through the formal DISN Connection Process rather than open peering. No RPKI data could be retrieved this cycle because the query tool requires a specific prefix. No notable public abuse signal or Spamhaus ASN-DROP listing was found.

Operator / registrant

United States Department of Defense (DoD), org handle USDDD, 3990 E. Broad Street, Columbus, OH 43218 [Confirmed] — https://rdap.arin.net/registry/autnum/532

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/532

Allocated

1989-09-29 (ARIN RDAP autnum TOP-LEVEL registration event, distinct from the nested contact/org-entity dates such as MIL-HSTMST-ARIN 1993-05-26 or USDDD org 2007-01-12, which are not allocation dates); last changed 2025-09-12 [Confirmed] — https://rdap.arin.net/registry/autnum/532

Org status

ARIN registration active/maintained, but the ASN has not been visible in the global BGP table since 2026-03-18 — registration valid, routing currently dormant [Confirmed] — https://rdap.arin.net/registry/autnum/532

Contacts

abuse/hostmaster disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil; registrations disa.columbus.ns.mbx.arin-registrations@mail.mil [Confirmed] — https://stat.ripe.net/data/abuse-contact-finder/data.json?resource=532

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-10; not listed on the 2026-05-29 Spamhaus ASN-DROP edition; a bgp.he.net "announces bogons" tag exists but has no independently corroborating source and is not recorded as a confirmed incident

Network & routing

Network type

DNIC-series U.S. military ASN (DNIC-AS-00532); administrative/technical/abuse contact via DISA-Columbus [Confirmed] — https://rdap.arin.net/registry/autnum/532

Size / current routing

0 IPv4 and 0 IPv6 prefixes currently announced; historically originated 139.77.6.0/24, 139.77.8.0/24, 139.77.12.0/24, with 139.77.8.0/24 first seen 2013-02-28 and last seen 2026-03-17 [Confirmed] — https://stat.ripe.net/data/routing-status/data.json?resource=532

Routing/peering

not currently visible in the global table — 0 of 325 RIS IPv4 peers and 0 of 322 RIS IPv6 peers see a route; no PeeringDB entry (peeringdb.com/asn/532 returns 404); CAIDA AS-degree total 0 (no upstreams, peers, or customers observed)

[Confirmed] — https://stat.ripe.net/data/routing-status/data.json?resource=532, https://api.asrank.caida.org/v2/restful/asns/532

RPKI

Unknown — RIPEstat's rpki-validation endpoint was not queried against a specific prefix this cycle, so no ROA/validity data was obtained [Unknown]

Notable usage

internal DoD/DODIN-management role consistent with the DNIC series; bgp.he.net (single-source, unconfirmed by independent WebSearch this cycle) reports historical peers AS27064 and AS27065, both internal DoD ASNs [Likely] — https://bgp.he.net/AS532

CAIDA AS rank

79459; not a route-server clique member; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — https://api.asrank.caida.org/v2/restful/asns/532

Alternate historical operator label

some third-party AS listings (e.g. bgp.potaroo.net/cidr/autnums.html) historically attribute AS532 to "Heidelberg CDOIM," reflecting a former U.S. Army Garrison Heidelberg, Germany association; this conflicts with and is weaker than the Confirmed ARIN RDAP registrant (DoD/USDDD, Columbus OH) and is recorded only as an unconfirmed historical note

[Unknown] — https://bgp.potaroo.net/cidr/autnums.html

Analyst note

dormant DoD/DNIC-series ASN — ARIN registration remains active and well-maintained, but the AS has had no visible BGP announcements since March 2026, and all routing/topology sources (RIPEstat, CAIDA) agree on zero current activity.