AS514

AS514 (DSADC-MECH) is a legacy 16-bit autonomous system number registered under ARIN to the United States Department of Defense, administered through the Defense Information Systems Agency's Columbus, Ohio facility (DISA-Columbus). The ASN's top-level ARIN RDAP registration event dates to August 31, 1989, making it one of the oldest DoD-held ASNs still on record, alongside a most-recent registry update of September 12, 2025. Unlike many legacy government ASNs, AS514 shows a documented operational history: RIPEstat, bgp.he.net, and bgp.tools all agree it originated at least two IPv4 blocks over the past decade — 199.208.251.0/24, first observed in June 2016, and 204.34.199.0/24, last seen in mid-September 2025 — before dropping out of the global routing table entirely around September 18, 2025. CAIDA's AS Rank places it at 79,459 globally, with a customer cone reduced to itself alone (zero prefixes, zero addresses), and RIPEstat's RIS visibility check confirms zero of 327 IPv4 peers and zero of 321 IPv6 peers currently see any announcement from it. Notably, bgp.he.net flags a historical bogon announcement for the 204.34.199.0/24 block, a routing-hygiene note rather than an abuse classification, and no PeeringDB network record exists for AS514. Registry status itself is contested: ARIN RDAP reports the autnum as "active," while the third-party aggregator ipinfo.io separately marks it "Inactive," a discrepancy this record preserves rather than resolves. No public abuse, hijack, or community-discussion signal was found for AS514 as of this research pass, consistent with its status as a dormant DoD-internal resource rather than a commercially operated network.

Operator

United States Department of Defense (DoD); ARIN org handle USDDD [Confirmed] — https://rdap.arin.net/registry/autnum/514

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/514

Allocated

1989-08-31 (ARIN RDAP autnum TOP-LEVEL registration event, not an entity/org/contact-level date); last changed 2025-09-12 [Confirmed] — https://rdap.arin.net/registry/autnum/514 (corroborated: https://bgp.tools/as/514)

Org status

conflicting signals — ARIN RDAP autnum status = "active"; third-party aggregator ipinfo.io separately reports "Inactive" (0 announced resources) [Unknown, conflicting] — https://rdap.arin.net/registry/autnum/514, https://ipinfo.io/AS514

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-10 — not found via Spamhaus resources, NANOG archives, or general threat-intel indexes searched (abuse.ch, hybrid-analysis, IPQS); absence of search hits, not a first-party clean confirmation

Abuse contact

disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (authoritative RIR: ARIN)

Network & routing

Network type

US Department of Defense / military-internal network, not a commercial ISP [Likely] — https://rdap.arin.net/registry/autnum/514, https://ipinfo.io/AS514

Routing status

NOT currently announced — 0 of 327 RIS peers see IPv4, 0 of 321 see IPv6; not visible in the global routing table since 2025-09-18 [Confirmed] — https://stat.ripe.net/AS514, https://bgp.he.net/AS514, https://bgp.tools/as/514

CAIDA AS Rank

79,459; customer cone = singleton (1 ASN, 0 prefixes, 0 addresses); asnDegree 0 customers / 0 peers / 0 providers [Confirmed] — https://asrank.caida.org/asns/514

Peering

no PeeringDB network record exists for AS514 (404 on peeringdb.com/asn/514 and the PeeringDB net API) [Confirmed, absence]; bgp.he.net lists one historically observed peer, AS27064 (DoD Network Information Center), not current [Likely] — https://bgp.he.net/AS514

ASN / name

AS514, "DSADC-MECH" [Confirmed] — https://rdap.arin.net/registry/autnum/514

Registrant location

DISA-Columbus, 300 North James Road, Whitehall, OH 43213, United States [Confirmed] — https://rdap.arin.net/registry/autnum/514

Official website

Unknown / not applicable — no AS514-specific public operator page found; general DISA site (disa.mil) carries no AS514-specific content [Unknown]

Historical announcements

199.208.251.0/24 (first seen 2016-06-23) and 204.34.199.0/24 (last seen 2025-09-16/18) [Confirmed] — https://stat.ripe.net/AS514, https://bgp.he.net/AS514

Bogon note

bgp.he.net flags a historical bogon (unallocated/reserved-space) announcement for 204.34.199.0/24 — a routing-hygiene flag, not an abuse classification [Confirmed] — https://bgp.he.net/AS514

Analyst note

Long-allocated (1989) DoD ASN with a real, documented routing history through 2025 rather than perpetual dormancy; withdrew from the global table around 2025-09-18. RDAP "active" vs. ipinfo.io "Inactive" status is left as an open discrepancy rather than resolved by inference.