AS443

AS443 is a legacy autonomous system number registered under ARIN to Air Force Systems Networking, a U.S. Air Force / Department of Defense network function. In ARIN's registry it is not represented as a standalone per-ASN object but as one number inside a single contiguous block registration, AFCONC-BLOCK1-AS, spanning AS379 through AS508 (130 ASNs) — how ARIN records this legacy 1989 allocation. The registrant organization (ARIN handle 7ESG) sits at Maxwell AFB, Alabama, while day-to-day administrative, technical, and abuse contact is delegated to DISA-Columbus (Defense Information Systems Agency) in Whitehall, Ohio, consistent with DISA's role managing DoD's ARIN-registered legacy AS number blocks. The key triage point for AS443 is that it is effectively dormant: every routing source consulted (RIPEstat, CAIDA AS Rank) agrees it announces zero IPv4 and zero IPv6 prefixes, has zero visible BGP peers, zero upstreams, zero customers, and no IXP memberships. RIPEstat routing-status shows 0 of 324 RIS peers seeing it on IPv4 and 0 of 320 on IPv6, with 0 observed neighbours; its CAIDA AS rank of 79,459 sits near the bottom of the global ranking, and its customer cone is a singleton (the ASN itself, 0 prefixes, 0 addresses). RPKI posture cannot be assessed because there are no active originations and therefore no ROAs to validate. No standalone operator website, no PeeringDB record (peeringdb.com/asn/443 returns 404), and no public peering policy exist — all expected for a military ASN. No notable public abuse signal was found as of 2026-07-02 — not in AbuseIPDB, Spamhaus, Talos Intelligence, VirusTotal, or NANOG archives — consistent with a clean, dormant ASN held by a DoD operator.

Operator

Air Force Systems Networking (U.S. Air Force / DoD; ARIN registrant handle 7ESG, Maxwell AFB, AL) [Confirmed] — ARIN RDAP (rdap.arin.net/registry/autnum/443)

Country / RIR

US, ARIN [Confirmed] — RIPEstat abuse-contact-finder (authoritative_rir: arin)

Allocated

1989-08-04 (ARIN registry date for the AFCONC-BLOCK1-AS block registration under which AS443 falls, NOT an IEEE date — IEEE publishes no ASN registration dates); last changed 2008-06-06 [Confirmed] — ARIN RDAP autnum top-level events

Org status

active registration per ARIN RDAP (status: active), but operationally dormant/unannounced per third-party BGP visibility; the registrant is an active U.S. Air Force command function [Confirmed] — ARIN RDAP, ipinfo.io/AS443

Contacts

admin/technical/abuse REGIS10-ARIN "Registration (DISA-Columbus)", 300 North James Road, Whitehall, OH 43213; disa.columbus.ns.mbx.arin-registrations@mail.mil; +1-844-347-2457 ext.2. Registrant org: Air Force Systems Networking, 501 East Moore Dr., Bldg 884 Rm 1100 Gunther Annex, Maxwell AFB, AL 36114

[Confirmed] — ARIN RDAP

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-02 — not in AbuseIPDB, Spamhaus, Talos Intelligence, VirusTotal, or NANOG archives; consistent with a BGP-inactive DoD ASN

Network & routing

Network type

U.S. Department of Defense / U.S. Air Force internal network infrastructure (government/military), not a commercial ISP, hosting provider, or content network [Likely] — ARIN RDAP, ipinfo.io/AS443

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses [Confirmed] — RIPEstat routing-status / CAIDA AS Rank (2026-07)

Routing/peering

NOT announced — 0 RIS peers seeing it (0/324 v4, 0/320 v6); CAIDA degree total 0 (customer 0, peer 0, provider 0); no upstreams or peers visible [Confirmed] — RIPEstat, CAIDA ASRank. No PeeringDB record (peeringdb.com/asn/443 → 404); no public peering policy, consistent with a military ASN

[Confirmed] — peeringdb.com/asn/443

RPKI

not assessable — AS443 announces no prefixes, so there are no ROAs to validate; RIPEstat rpki-validation requires a prefix and was skipped (none to supply) [Confirmed] — RIPEstat

Notable usage

AS443 is one ASN within the large contiguous ARIN block AFCONC-BLOCK1-AS (AS379–AS508, 130 ASNs) registered to Air Force Systems Networking; currently dormant/unannounced in the global BGP table [Likely] — ARIN RDAP, ipinfo.io/AS443

Related ASNs

AS379–AS508 (the full AFCONC-BLOCK1-AS block registered to Air Force Systems Networking; AS443 is one member) [Confirmed] — ARIN RDAP (startAutnum 379 / endAutnum 508)

Analyst note

Encountered as a dormant legacy DoD/Air Force ASN. ARIN represents it via the block object AFCONC-BLOCK1-AS (handle AS379) rather than a per-ASN record — normal for old block allocations, not a data gap. Clean, inactive ASN.