AS797

AS797 is a legacy Ameritech-lineage autonomous system now registered to AT&T Services, Inc. that functions as a small, non-transit, address-holding ASN rather than an independently peering network. It announces a modest block of IPv4 space, carries no IPv6, and routes downstream of AT&T's own backbone ASN rather than maintaining external peering relationships of its own.

ARIN RDAP records the autnum's top-level registration event as 1990-12-13, with a "last changed" event of 2012-04-02. The RDAP object's top-level handle reads "AS795" while endAutnum is 797 and all self-links resolve to autnum/797 — this looks like a single combined ARIN registry object spanning AS795–AS797, with "AMERITECH-AS" retained as the registry name from the pre-AT&T-merger Ameritech entity even though the current registrant is AT&T Services, Inc.

RIPEstat's canonical routing status reports exactly 21 IPv4 prefixes and 170,752 addresses (~667 /24-equivalents) and zero IPv6, matching bgp.tools; bgp.he.net's crawler reports a higher count of 26, a crawler-level disagreement rather than an unresolved range. The customer cone (per CAIDA AS-rank) is small but not a bare singleton: 2 ASNs, spanning 33 prefixes and roughly 467,968 addresses — with a single observed upstream (AS7018, AT&T Enterprises) and only two BGP peers, both other AT&T-family ASNs (AS7018, AS11712). RPKI coverage is partial: at least one announced block (144.160.0.0/15) carries a valid ROA, but most of the ASN's space is uncovered. AS797 has no PeeringDB entry and is absent from AT&T's official peering-policy page, which names only five ASNs (AS7018, AS2685–AS2688) as covered by AT&T's peering program.

AT&T Services, Inc. is an active ARIN registrant (org handle ATTSE-Z), and AS797 appears to be one of many numbering resources AT&T holds rather than a network with its own public identity or peering program — there is no dedicated AT&T page describing AS797 specifically.

Operator

AT&T Services, Inc. (registrant org, handle ATTSE-Z; ARIN registry name AMERITECH-AS, a legacy Ameritech-lineage numbering resource) [Confirmed] — ARIN RDAP autnum/797

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/797

Allocated

1990-12-13 (ARIN RDAP autnum top-level "registration" event); last changed 2012-04-02. Note: the RDAP object's top-level handle reads "AS795" while endAutnum/self-links are 797, consistent with a combined AS795–AS797 registry block; the top-level events dates were used as instructed regardless

[Confirmed] — ARIN RDAP autnum/797

Org status

active (ARIN RDAP status "active"); registrant AT&T Services, Inc. (handle ATTSE-Z, org record registered 2009-01-30, last changed 2024-07-30) is a functioning AT&T subsidiary [Confirmed] — ARIN RDAP autnum/797

Contacts

abuse@att.net (ARIN abuse POC, org label retains legacy "Ameritech" naming); routing_poc@att.com (ARIN routing POC) [Confirmed] — ARIN RDAP autnum/797. (An individual named admin/tech POC is present in the RDAP record but is withheld here as personal contact detail per project policy, not published on this page.)

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-08-01 — not in Spamhaus SBL/DROP/ROKSO, NANOG archives, or public threat-feed/DDoS-source-ranking searches; no documented BGP hijack or route-leak incident attributed to AS797

Network & routing

Network type

ISP / address-holding ASN (ipinfo.io type "isp"); legacy Ameritech numbering resource now used by AT&T primarily to announce IPv4 blocks (e.g. 144.160.0.0/15) downstream of AT&T's main peering ASN AS7018, rather than as an independent transit/peering network

[Likely] — ipinfo.io/AS797, bgp.he.net/AS797

Size

21 announced IPv4 prefixes (RIPEstat canonical routing status, matching bgp.tools; bgp.he.net's crawler reports a higher 26 — crawler-level disagreement, not an unresolved range), 170,752 addresses (~667 /24-equivalents); 0 IPv6 prefixes; customer cone 2 ASNs (CAIDA AS-rank), spanning 33 prefixes and ~467,968 addresses [Confirmed for RIPEstat prefix/address count and CAIDA cone; Likely for bgp.he.net's differing crawler count] — stat.ripe.net/AS797, bgp.he.net/AS797, bgp.tools/as/797, asrank.caida.org/asns/797

Routing/peering

single observed upstream AS7018 (AT&T Enterprises, LLC); 2 observed BGP peers, both AT&T-family (AS7018, AS11712); no PeeringDB entity for AS797; not listed on AT&T's official peering-policy page, which names only AS7018/AS2685/AS2686/AS2687/AS2688 [Confirmed for peering-policy-page absence; Likely for peer/upstream counts] — corp.att.com/peering/, peeringdb.com apidocs, bgp.tools/as/797, bgp.he.net/AS797

RPKI

mixed — at least one announced prefix (144.160.0.0/15) is RPKI-valid/ROA-signed, but the majority of AS797's other announced prefixes have no RPKI/ROA coverage [Likely] — bgp.tools/as/797

Notable usage

legacy Ameritech-origin numbering resource; AT&T maintains no dedicated public page for AS797 specifically (unlike its flagship peering ASN AS7018); functions as a downstream address-announcing ASN within AT&T's broader network [Likely] — corp.att.com/peering/, ARIN RDAP autnum/797

Related ASNs

AS7018 (AT&T Enterprises, LLC — AS797's single observed upstream/transit and a BGP peer); AS11712 (AT&T Services, Inc. — the other observed BGP peer) [Confirmed] — bgp.he.net/AS797, bgp.tools/as/797

Analyst note

AS797 is a legacy Ameritech-lineage ASN whose live routing (single upstream AS7018, two intra-AT&T peers, no independent peering policy or PeeringDB entry, and a small customer cone of 2 ASNs per CAIDA AS-rank spanning 33 prefixes / ~467,968 addresses) shows it operating as an address-holding numbering resource within AT&T rather than an independently significant network. The canonical prefix count is 21 (RIPEstat, matching bgp.tools); bgp.he.net's crawler reports 26, a crawler-level disagreement rather than an unresolved range.