AS723

AS723 is a dormant, unrouted autonomous system number registered under ARIN to the United States Department of Defense (DoD), operationally managed by the Defense Information Systems Agency (DISA). As of July 2026 it announces zero IPv4 and zero IPv6 prefixes, has zero observed BGP peers or upstreams, and carries a CAIDA AS Rank of 79,459 — consistent with an ASN not currently used on the public Internet.

AS723 sits inside DNIC-ASBLK-00721-00726, a shared ARIN block covering AS721 through AS726 that is registered as a single RDAP object to the DoD (org handle USDDD, 3990 E. Broad Street, Columbus, OH). Because the record is block-level rather than per-ASN, several fields — including the allocation date — describe the block as a whole, not AS723 individually.

The RDAP autnum object's top-level events array carries only a "last changed" entry (2025-09-12); it holds no top-level "registration" event, so the original allocation date cannot be confirmed from this record. Entity-level dates nested under contacts, such as the USDDD org's 2007-01-12 registration, describe those contact records rather than the ASN's own allocation, and are not substituted here.

DISA operates the DODIN (Department of Defense Information Network) and its DISN transport layer, connecting to commercial/Internet networks only through DoD CIO-approved Access/Peering Gateways as a matter of general DISN architecture policy. No AS723-specific peering policy, PeeringDB record, or named service ties to this ASN individually; it is presumed part of DoD's broader legacy DNIC ASN holdings.

Operator

United States Department of Defense (DoD); network operationally managed by the Defense Information Systems Agency (DISA), a DoD combat support agency. ARIN registrant org handle USDDD. [Confirmed] — https://rdap.arin.net/registry/autnum/723

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/723

Allocated

Unknown — the autnum RDAP record's top-level events[] array contains only a "last changed" entry (2025-09-12); no top-level "registration" event is present in this shared block record. Entity-level dates (e.g. USDDD org 2007-01-12) belong to contact records, not the ASN's own allocation.

[Confirmed] — https://rdap.arin.net/registry/autnum/723

ASN block

part of DNIC-ASBLK-00721-00726 (AS721–AS726), a shared DNIC block registered to USDDD, 3990 E. Broad Street, Columbus, OH 43218 [Confirmed] — https://rdap.arin.net/registry/autnum/723

Org status

Active per ARIN RDAP status field; registrant is the US Department of Defense, a federal government entity; DISA (referenced in admin/tech contacts) is a DoD combat support agency headquartered at Fort Meade, MD [Confirmed] — https://rdap.arin.net/registry/autnum/723

Contacts

disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (abuse/technical/noc, MIL-HSTMST-ARIN); disa.columbus.ns.mbx.arin-registrations@mail.mil (REGIS10-ARIN); 300 North James Road, Whitehall, OH 43213 [Confirmed] — https://rdap.arin.net/registry/autnum/723

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-25 — not in Spamhaus, AbuseIPDB, general threat feeds, or NANOG archives; dormant DoD-held legacy ASN

Network & routing

Network type

US federal government / military network; DISA operates the DODIN/DISN infrastructure; not a commercial ISP or hosting provider [Likely] — https://www.esd.whs.mil/Portals/54/Documents/DD/issuances/dodi/801001p.pdf

Size

dormant — 0 IPv4/IPv6 prefixes, 0 address estimate; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — https://asrank.caida.org/asns/723, https://stat.ripe.net/AS723

Routing/peering

NOT announced — 0 RIS peers observing it (0/331 v4, 0/324 v6); CAIDA degree total 0 (customer 0, peer 0, provider 0); no upstreams or peers visible in RIPEstat, CAIDA, or bgp.he.net [Confirmed]. No AS723-specific PeeringDB record (404) or public peering policy; general DISN policy routes external connections through DoD CIO-approved Access/Peering Gateways

[Likely] — https://www.peeringdb.com/asn/723, https://dl.dod.cyber.mil/wp-content/uploads/connect/pdf/unclass-DISN_CPG.pdf

RPKI

not assessable — no announced prefixes, so there are no ROAs to validate [Confirmed] — https://stat.ripe.net/AS723

Notable usage

no AS723-specific usage documentation found; presumed part of DoD's broader legacy DNIC ASN holdings operated under DISA's DODIN/DISN infrastructure [Unknown]

Related ASNs

part of the AS721–AS726 shared DNIC block; sibling DoD ASNs exist elsewhere in DNIC space (e.g. AS749, which does have a PeeringDB record) [Likely] — https://www.peeringdb.com/asn/723

Last changed

2025-09-12 (RDAP top-level "last changed" event) [Confirmed] — https://rdap.arin.net/registry/autnum/723

Analyst note

Shared block RDAP record (AS721–AS726) rather than a per-ASN record; allocated_date is left Unknown because the top-level events[] array carries only a "last changed" entry, and the entity-level 2007-01-12 date belongs to the USDDD org contact, not the ASN itself. Routing is unambiguous across RIPEstat/CAIDA/bgp.he.net: fully dormant, zero announcements.