AS711

AS711 is a dormant legacy autonomous system registered under ARIN to Torrejon Air Base (org handle TAB-4, associated ASN name SB-COMM-AS), a Spanish Air and Space Force installation near Madrid historically co-used by the US Air Force — and it announces zero IPv4 and zero IPv6 prefixes today, despite an "active" registry status.

Every routing source consulted (RIPEstat, CAIDA AS Rank, bgp.he.net) agrees: 0 announced prefixes in either address family, 0 visible BGP peers, 0 upstreams, and 0 RIS peers seeing it globally (0/328 IPv4, 0/324 IPv6). CAIDA's customer cone is a singleton — the ASN itself, 0 prefixes, 0 addresses — with an AS rank of 79,459, near the bottom of the global scale, reflecting total routing inactivity rather than any recent compromise or shutdown.

The ARIN RDAP autnum record's top-level registration event dates AS711 to 1990-06-15, with a last-changed event of 2000-12-26 — both first-party RIR registry facts, not IEEE or third-party scrape artifacts. No operator-authored website or PeeringDB entry was found; the sole abuse/technical contact on file (Paul S. Kim, The MITRE Corporation) is flagged by ARIN itself as unvalidated since 2010-06-19, consistent with a long-abandoned assignment rather than a maintained network.

Operator

Torrejon Air Base (ARIN org handle TAB-4); ASN name SB-COMM-AS [Confirmed] — ARIN RDAP autnum https://rdap.arin.net/registry/autnum/711, ARIN org https://whois.arin.net/rest/org/TAB-4

Country / RIR

ES, ARIN [Confirmed] — ARIN RDAP autnum

Allocated

1990-06-15 (ARIN RDAP autnum top-level "registration" event — first-party RIR registry fact); last changed 2000-12-26 [Confirmed] — https://rdap.arin.net/registry/autnum/711

Org status

Active per ARIN registration status, but the only listed POC is marked unresponsive/unvalidated since 2010-06-19 and registrant address data is minimal (country ES only) — consistent with a dormant legacy assignment [Likely] — https://rdap.arin.net/registry/autnum/711

Contacts

Paul S. Kim, The MITRE Corporation, Bedford MA (ARIN handle PSK-ARIN) — listed via ARIN RDAP entity, flagged unvalidated since 2010-06-19; the on-file individual mailbox on a legacy MITRE host is not republished here [Confirmed for listing; Likely stale] — https://rdap.arin.net/registry/autnum/711

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-25 — not in Spamhaus ASN-DROP, CleanTalk, or NANOG/seclists archives; consistent with a dormant, non-routing ASN

Network & routing

Network type

Likely a legacy military/institutional network, not a public transit ISP; not confirmable from an operator-authored source [Likely] — ARIN RDAP autnum

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 / bgp.he.net (2026-07)

Routing/peering

NOT announced — 0 RIS peers seeing it (0/328 v4, 0/324 v6); CAIDA degree total 0 (customer 0, peer 0, provider 0); no upstreams or peers visible in any source; no PeeringDB record (404 on net API) [Confirmed] — https://asrank.caida.org/asns/711, https://www.peeringdb.com/api/net?asn=711

RPKI

not assessable — AS711 announces no prefixes, so there are no ROAs to validate [Confirmed] — RIPEstat rpki-validation requires a prefix parameter; none exists for this ASN

Notable usage

No operator-authored source found describing usage; ARIN admin POC ties administratively to The MITRE Corporation, Bedford MA, but this reflects ARIN liaison, not confirmed network operation [Unverified] — https://rdap.arin.net/registry/autnum/711

Related ASNs

none confirmed [Unknown]

Analyst note

Decades-old, unused ASN belonging to a Spanish military airbase; plausible original use was a US DoD/MITRE-administered link never brought into commercial routing, or decommissioned before the RIS/BGP visibility era. No fabricated dates; allocated_date recorded from the RDAP autnum top-level registration event, not the nested entity dates (which coincidentally match but are a separate field).