AS518

AS518 is a legacy autonomous system number registered under ARIN to the United States Department of Defense (DoD), operationally administered by the Defense Information Systems Agency (DISA) through DISA-Columbus and the DoD Network Information Center (DoD NIC). ARIN RDAP's top-level autnum registration event places the ASN's allocation at 1989-09-08, distinct from later entity-level events (individual point-of-contact registrations dated 1993, 2007, and 2009) that reflect administrative record updates rather than the original AS assignment. Unlike many dormant government-held ASNs, AS518 is actively announced: RIPEstat and CAIDA both show 15 originated IPv4 prefixes (roughly 7,424 addresses) and 2 IPv6 prefixes, with near-universal RIS peer visibility (326/327 IPv4 peers, 321/321 IPv6 peers). CAIDA AS Rank places it at 19,044 globally with a customer-cone profile typical of a single-homed stub network: one upstream provider, zero customers, zero peers. CAIDA's cliqueMember flag appears to be a graph-methodology artifact given the otherwise clear leaf-network profile rather than evidence of Tier-1 routing behavior. A single-source IRR reference associates the ASN with the AS-DREN (Defense Research and Engineering Network) as-set, though this is not RDAP-confirmed. No public abuse or threat-intelligence signal was found for AS518 itself, consistent with the low public visibility typical of DoD-administered address space; community/operator forums show no NANOG, Reddit, or PeeringDB presence for it.

Operator

United States Department of Defense (DoD); operationally administered by the Defense Information Systems Agency (DISA), DISA Columbus / DoD Network Information Center (DoD NIC) [Confirmed] — https://rdap.arin.net/registry/autnum/518, https://www.disa.mil/about

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/518

Allocated

1989-09-08 (ARIN RDAP top-level autnum registration event — a first-party RIR fact, not an entity-level POC date); last changed 2025-09-12 [Confirmed] — https://rdap.arin.net/registry/autnum/518

Org status

active (ARIN RDAP status: active); registrant is a U.S. federal government entity (org handle USDDD), not a company, so no incorporation/bankruptcy status applies [Confirmed] — https://rdap.arin.net/registry/autnum/518

Contacts

disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil (abuse/NOC/technical); DISA-Columbus, 300 North James Road, Whitehall, OH 43213 [Confirmed] — https://rdap.arin.net/registry/autnum/518

Security/abuse context

no notable public abuse/threat-intel signal found as of 2026-07-10 — not surfaced on Spamhaus ASN-DROP (partial check; list has migrated to a JSON-only feed), GreyNoise, or ThreatFox searches; a sampled IP within a DoDNIC-associated block (29.89.16.15) shows AbuseIPDB reports on file but a 0% abuse confidence score

Network & routing

Network type

government/military network, part of the DoD Information Network (DODIN), operated by DISA; not a commercial ISP/content network [Confirmed] — https://www.disa.mil/about, https://rdap.arin.net/registry/autnum/518

Size

15 IPv4 prefixes / ~7,424 IPv4 addresses; 2 IPv6 prefixes (2001:480:1610::/48, 2001:480:421::/48) [Confirmed] — https://stat.ripe.net/data/routing-status/data.json?resource=518, https://stat.ripe.net/data/announced-prefixes/data.json?resource=518

Routing/peering

announced, near-universal RIS visibility (326/327 IPv4 peers, 321/321 IPv6 peers); CAIDA degree total 1 (customer 0, peer 0, provider 1) — single-homed stub network; specific upstream ASN identity not resolved from available sources [Confirmed for counts / Unknown for upstream identity] — https://asrank.caida.org/asns/518, https://stat.ripe.net/data/routing-status/data.json?resource=518

RPKI

Unknown — rpki-validation requires a specific prefix argument, not queried in the bulk RIPEstat fetch used for this entry [Unknown]

Notable usage

legacy DoD Network Information Center ASN (DNIC-AS-00518) used for DoD network address administration; a single-source IRR reference associates it with the AS-DREN (Defense Research and Engineering Network) as-set, not RDAP-confirmed [Likely] — https://bgp.he.net/irr/as-set/AS-DREN

Related ASNs

none independently resolved for this entry; the AS-DREN as-set reference is single-source and not RDAP-confirmed [Unknown]

Peering policy / website

no dedicated AS518-specific website or published peering policy; no PeeringDB net record exists (peeringdb.com/asn/518 returns 404) [Unknown] — https://www.peeringdb.com/asn/518, https://www.disa.mil/

Community corroboration

no NANOG list, Reddit, PeeringDB, or public BGP-incident-database presence found for AS518 — consistent with the low public visibility typical of DoD-administered networks, not a data-quality gap [Confirmed absence of public data]

Analyst note

unlike many dormant government-held legacy ASNs, AS518 is actively announced (15 IPv4 + 2 IPv6 prefixes) with a clear single-homed stub-network profile; CAIDA's cliqueMember:true flag is treated as a graph-methodology artifact given the degree-1 leaf profile, not evidence of Tier-1/clique routing behavior.