AS748

AS748 is a dormant U.S. Department of Defense autonomous system that currently announces zero IPv4 and zero IPv6 prefixes — RIPEstat's as-overview shows announced: false, and it has not been visible originating routes since 2022-06-21.

The ASN is registered under ARIN to the U.S. Department of Defense (entity handle USDDD), administered through DISA (Defense Information Systems Agency) via the Defense Network Information Center (DNIC), DISA-Columbus. Its only recorded routing history is a single IPv4 block, 140.16.106.0/23, first seen 2019-05-15 and last seen 2022-06-21 — never announced since, and no IPv6 space was ever observed.

CAIDA corroborates the dormancy independently: AS rank 79459 is registry-derived (CAIDA flags seen: false, cliqueMember: false), with zero upstream, peer, and customer degree, and a customer cone limited to the ASN itself (1 ASN, 0 prefixes, 0 addresses). No PeeringDB network record exists for AS748 (both the API and web lookup return HTTP 404, a verified absence rather than a failed query) — consistent with a closed government network that does not publish peering terms.

The ASN's own top-level ARIN RDAP registration date could not be confirmed. Two research angles independently proposed a "registration" event (1993-05-26 and 2007-01-12), but a third angle re-fetched the raw autnum object twice and found the top-level events[] array contains only a "last changed" entry (2025-09-12), with no registration eventAction present at all.

The two proposed dates most likely came from nested entity-level records (a POC registration and an org registration) rather than the ASN's own allocation event. Given that direct, twice-verified read of the source structure, allocated_date is recorded as genuinely unresolved rather than guessed.

Exposure

no active BGP announcements exist for AS748 (0 prefixes announced), so there is currently no live routed attack surface to assess.

Abuse signal

no notable public abuse signal found as of 2026-07-27 — Qrator Radar reports zero route leaks, hijacks, bogons, and DDoS amplifiers for AS748, but this near-zero reading is best explained by the ASN having no active announcements to measure, not a verified clean track record under load.

Reputation-source gaps

Spamhaus's ASN lookup and Cisco Talos Reputation Center both returned HTTP 403 to automated fetch this session, so their listing status for AS748 is genuinely Unknown rather than confirmed-clean.

RPKI

not assessable — there is no currently-announced prefix for AS748 to validate against, so ROA/RPKI status cannot be determined.

Operator

United States Department of Defense (DoD); administered by DISA (Defense Information Systems Agency) via the Defense Network Information Center (DNIC), DISA-Columbus [Confirmed] — ARIN RDAP autnum, ARIN RDAP entity USDDD

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum record for AS748

Allocated

Unknown — the RDAP autnum object's top-level events[] array carries only a "last changed" event (2025-09-12); no top-level "registration" eventAction is present, confirmed on two independent re-fetches. Two nested entity-level dates (org registration 2007-01-12, POC registration 1993-05-26) exist but are decoys, not the ASN's own allocation date

[Confirmed absence] — ARIN RDAP autnum record for AS748

Org status

active per ARIN RDAP autnum status field; last changed 2025-09-12 [Confirmed] — ARIN RDAP autnum record for AS748

Contacts

disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (abuse contact); DISA-Columbus, 300 North James Road, Whitehall, OH 43213 (technical/admin POC); registrant address 3990 E. Broad Street, Columbus, OH 43218 [Confirmed] — RIPEstat abuse-contact-finder for AS748, ARIN RDAP entity USDDD

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-27 — Qrator Radar shows zero leaks/hijacks/bogons/amplifiers, though this largely reflects the ASN having no active announcements to measure; Spamhaus and Talos reputation lookups both returned HTTP 403 and are Unknown, not confirmed-clean

Network & routing

Network type

U.S. federal government / military network [Confirmed] — ARIN RDAP autnum record

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses currently announced, 0 IPv6 prefixes; historically originated only one IPv4 block, 140.16.106.0/23, first seen 2019-05-15, last seen 2022-06-21 [Confirmed] — RIPEstat as-overview / announced-prefixes / routing-status for AS748

Routing/peering

NOT currently announced — CAIDA asnDegree totals 0 (upstream 0, peer 0, customer 0), customer cone = 1 ASN (itself), 0 prefixes, 0 addresses; no PeeringDB network record exists (404 verified on both API and web lookup) [Confirmed] — CAIDA AS Rank API for AS748, peeringdb.com/asn/748

RPKI

not assessable — no currently-announced prefix exists to validate against; the RPKI-validation query requires a prefix parameter that could not be supplied [Unknown] — stat.ripe.net/AS748

Notable usage

no confirmed operator-official statement of current usage found. Per third-party BGP looking-glass data only (not operator-confirmed), AS748 is cross-referenced with AS27064 (DoD Network Information Center) [Likely, third-party source only] — bgp.he.net/AS748

Related ASNs

AS27064 (DoD Network Information Center), per third-party bgp.he.net cross-reference only [Likely] — bgp.he.net/AS748

Last changed

2025-09-12 [Confirmed] — ARIN RDAP autnum top-level events

Analyst note

encountered as a dormant DoD/DISA ASN registered under the DNIC address block, no longer visible in the global routing table since mid-2022; the operator-official website could not be identified (a WebFetch of disa.mil returned no AS748/DNIC-specific content), so website is left Unknown rather than guessed.