AS656

AS656 sits inside a single ARIN block registration, DNIC-ASBLK-00616-00665, that covers the contiguous range AS616 through AS665 and is registered to the United States Department of Defense (DoD), with day-to-day administration handled by DISA (Defense Information Systems Agency) out of Columbus, Ohio. The block's own RDAP autnum object carries a top-level registration event dated 1990-04-19 and a last-changed event dated 2025-09-12; those are the block's registry-level facts and apply to every ASN drawn from the range, including AS656. Operationally the ASN is small and quiet: it originates exactly one IPv4 prefix, 139.242.48.0/24 (256 addresses), no IPv6 space, and is visible to nearly all RIS route collectors (324 of 325 IPv4 peers). CAIDA ranks it 67,700th globally with a customer cone of just itself — a stub network, not a transit provider — and records a single observed BGP neighbor, AS27065, itself another DoD-registered ASN. CAIDA's geolocation (Columbus, OH) independently corroborates the DISA-Columbus registrant address on file. No PeeringDB record, official operator website, or published peering policy exists for this ASN specifically. Security research turned up no abuse, blocklist, or NANOG-incident history tied to AS656, aside from a single uncorroborated Hurricane Electric flag noting the ASN has been observed announcing bogon space — a routing-hygiene note, not a confirmed incident.

Operator

United States Department of Defense (DoD) — org handle USDDD, 3990 E. Broad Street, Columbus, OH 43218, US; day-to-day admin by DISA-Columbus [Confirmed] — https://rdap.arin.net/registry/autnum/656

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/656

Allocated / last changed

1990-04-19 (autnum top-level registration event); last changed 2025-09-12 (autnum top-level event). Entity-level dates under entities[] — MIL-HSTMST-ARIN 1993-05-26, REGIS10-ARIN 2009-06-24, USDDD org 2007-01-12 — belong to separate contact/org records, not the autnum object, and were excluded

[Confirmed, two-angle corroborated] — https://rdap.arin.net/registry/autnum/656

Website

Unknown — no ASN-specific operator website found; disa.mil and dl.dod.cyber.mil exist but do not name AS656 [Unknown] — https://www.disa.mil/, https://dl.dod.cyber.mil/

Org status

Active [Confirmed] — https://rdap.arin.net/registry/autnum/656

IANA reference

none applies (RIR-allocated DoD block, not tied to a specific RFC) — left blank, not fabricated.

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-17 — checked CleanTalk (0 detected IPs, 0.00% spam rate), Hurricane Electric, and search coverage of Spamhaus/AbuseIPDB/NANOG archives, none abuse-specific to AS656. One single-source, uncorroborated note: Hurricane Electric's BGP Toolkit flags AS656 as having announced bogon space — a routing-hygiene heuristic, not a documented incident [Likely for the bogon flag; Confirmed for the absence of other abuse signal] — https://bgp.he.net/AS656, https://cleantalk.org/blacklists/as656

Network & routing

Network type

government/military infrastructure block (DoD Network Information Center), non-commercial; no operator self-published classification exists [Likely] — https://rdap.arin.net/registry/autnum/656

Size / routing

1 announced IPv4 prefix (139.242.48.0/24, 256 addresses), 0 IPv6; visible to 324/325 IPv4 RIS peers, 0/320 IPv6 [Confirmed] — https://stat.ripe.net/AS656, https://bgp.he.net/AS656

CAIDA rank / cone

AS rank 67,700; clique member true; customer cone = 1 ASN / 1 prefix (stub/leaf AS); IXP membership null [Confirmed] — https://asrank.caida.org/asns/656

Peering

single observed BGP neighbor, AS27065 (also DoD-registered); no PeeringDB record for AS656 (API query returned 404); peering policy not publicly published [Confirmed neighbor / Unknown policy] — https://stat.ripe.net/AS656, https://bgp.he.net/AS656, https://www.peeringdb.com/api/net?asn=656

RPKI

not evaluated — RIPEstat's rpki-validation lookup was skipped upstream (requires a --prefix argument, none supplied); no ROA determination available [Unknown] — https://stat.ripe.net/AS656

Geo footprint

CAIDA geolocates the ASN at Columbus, OH (39.97, -83.01), consistent with the DISA-Columbus registrant/contact address on the RDAP record [Confirmed] — https://asrank.caida.org/asns/656, https://rdap.arin.net/registry/autnum/656

Related ASNs

AS27065 (only observed BGP neighbor, also DoD-registered); AS656 is one member of the AS616–AS665 DNIC block [Confirmed] — https://bgp.he.net/AS656

ASN / block

AS656, part of ARIN block record DNIC-ASBLK-00616-00665 (RDAP handle "AS616", covers AS616–AS665) [Confirmed] — https://rdap.arin.net/registry/autnum/656

Analyst note

The block's top-level RDAP registration date (1990-04-19) and last-changed date (2025-09-12) are recorded as this ASN's allocated_date/last_changed per instructions — these are first-party ARIN registry facts, not IEEE/OUI-style third-party scrapes, and were not nulled. Nested entity-level dates (contact/org record events) were correctly excluded as decoys.