AS489

AS489 is a legacy autonomous system number that ARIN registers as part of a shared block, AFCONC-BLOCK1-AS, spanning AS379 through AS508 and held by the registrant "Air Force Systems Networking" (ARIN org handle 7ESG, address on file at Maxwell AFB, Alabama). ARIN does not expose a standalone RDAP record for AS489 itself — the block-level record is the authoritative RIR entry, and its top-level events show a registration date of 1989-08-04 and a last-changed date of 2008-06-06. Administrative, technical, and abuse contact duties have since been consolidated under DISA-Columbus (handle REGIS10-ARIN), even though the registrant of record remains the Air Force Systems Networking organization. Research ties the block to the 754th Electronic Systems Group (754 ELSG), part of the 554th Electronic Systems Wing under Air Force Materiel Command, which supports combat information systems and enterprise networking for the U.S. Air Force and DoD — though no source confirms 754 ELSG as the operator of AS489 specifically rather than the wider block. Every routing data source consulted agrees AS489 is completely dormant: zero announced IPv4/IPv6 prefixes, zero BGP peers across 327 (v4) and 321 (v6) RIS peer feeds, and a CAIDA customer cone of one ASN with no prefixes or addresses. No public abuse signal was found.

Operator (specific unit)

tentatively the 754th Electronic Systems Group (754 ELSG, 554th Electronic Systems Wing, AFMC/USAF) based on public DoD press coverage of the 7ESG-adjacent org, but no source ties 754 ELSG to AS489 by name specifically rather than the shared block [Likely] — https://www.hanscom.af.mil/News/Article-Display/Article/381978/754-elsg-division-shapes-supports-it-purchases-across-dod/

Country

US [Confirmed] — https://ipinfo.io/AS489

Allocated (RIR top-level registration event)

1989-08-04; last changed: 2008-06-06 — extracted from the autnum's top-level events[] (eventAction=registration / last changed), not the nested entity/contact record, which carries unrelated 2009/2026 contact-update dates

[Confirmed] — https://rdap.arin.net/registry/autnum/489, corroborated by https://ipinfo.io/AS489

Org status

active per ARIN RDAP (status: active on the containing AFCONC-BLOCK1-AS block); admin/technical/abuse contact now handled by DISA-Columbus (REGIS10-ARIN) rather than a unit-level contact, while the registrant of record remains 7ESG / Air Force Systems Networking

[Confirmed] — https://rdap.arin.net/registry/autnum/489

Website

no dedicated official website found for AS489 or a specific operating unit; sibling Air Force units publish pages under af.mil (hanscom.af.mil, wpafb.af.mil) but no canonical AS489-specific page exists [Likely, sourced null] — https://www.hanscom.af.mil/, https://www.wpafb.af.mil/

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-10 — not on Spamhaus DROP/ASN-DROP or common community ASN-blacklist aggregators, and no NANOG archive hits; consistent with an ASN that has not announced routes for roughly 18 years

Network & routing

Network type

U.S. military/government network (not a commercial ISP, transit provider, hosting company, or ordinary enterprise) [Confirmed] — https://www.wpafb.af.mil/News/Article-Display/Article/1101451/office-supports-af-network/

Routing status

NOT announced — 0 IPv4 and 0 IPv6 prefixes; 0 of 327 RIS peers see it on v4, 0 of 321 on v6; 0 observed neighbours; CAIDA AS degree total/customer/peer/provider all 0 [Confirmed] — RIPEstat routing-status & announced-prefixes (resource=489), CAIDA ASRank API (asn=489)

CAIDA rank / customer cone

rank 79,459; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses; not a clique member; not seen in CAIDA topology [Confirmed] — CAIDA ASRank API (asn=489)

RPKI

not assessable — RIPEstat's rpki-validation query requires a prefix, and AS489 announces none, so there are no ROAs to validate [Confirmed, sourced null] — RIPEstat rpki-validation (resource=489)

Peering policy

Unknown/not publicly published. PeeringDB has an org page (id 20118) for "Air Force Systems Networking" but it lists only AS123, AS65, AS175, AS221, and AS301 as member networks — AS489 does not appear, and no peering-policy text or contact is published

[Confirmed for the negative finding] — https://www.peeringdb.com/org/20118

Notable usage

no AS489-specific traffic or usage data found; sibling/parent units within the same organization describe supporting secure combat information systems and enterprise networking for the Air Force and DoD

[Likely] — https://www.wpafb.af.mil/News/Article-Display/Article/1101451/office-supports-af-network/

Related ASNs

shares the AFCONC-BLOCK1-AS block range AS379–AS508; third-party mirrors (not ARIN RDAP directly) associate nearby ASNs AS385, AS399, AS400, AS486, and AS491 with the same "Air Force Systems Networking" organization [Likely] — https://whois.ipip.net/AS486, https://bgpview.io/asn/491

ASN

AS489 [Confirmed] — https://rdap.arin.net/registry/autnum/489

Registry block / RIR

ARIN, shared block AFCONC-BLOCK1-AS (range AS379–AS508); AS489 has no individual RDAP record, only the block-level entry [Confirmed] — https://rdap.arin.net/registry/autnum/489

Registrant / holder

"Air Force Systems Networking" (ARIN org handle 7ESG), address 501 East Moore Dr., Maxwell AFB, AL 36114 [Confirmed] — https://rdap.arin.net/registry/autnum/489

IANA RFC reference

none found / not applicable — left blank rather than invented [Unknown, sourced]

Analyst note

A5 (community corroboration) abstained with no NANOG/Reddit findings and did not independently verify allocated_date or organization — treated as a non-finding, not a refutation of the RDAP-sourced facts above. A4 flagged a tool-behavior anomaly where a WebFetch summary of the RDAP response echoed the block's own handle field ("AS379") rather than "AS489"; this is expected ARIN RDAP behavior for a query inside a shared legacy block (confirmed directly in the raw RDAP JSON: startAutnum: 379, endAutnum: 508), not a data error — two independent non-ARIN mirrors (bgp.he.net, ipinfo.io) corroborate the same organization and dates for AS489 specifically.