Autonomous system
AS13979 ATT-IPFR
Unclassified ARIN
Summary
AT&T Enterprises
telecom enterprise business
A carrier announcing a computer manufacturer's address space, plus a four-address block from a research network.
What it's used for
- A carrier-run enterprise network. 15,364 addresses across five IPv4 prefixes, eleven observed BGP neighbours, and no IPv6 announced.
Notable
- The AS handle is
ATT-IPFRand the holder isAT&T Enterprises, LLC. - Four blocks are
15.12.96.0/19,15.12.80.0/20,15.12.64.0/21and15.12.76.0/22, all under the netnameHP-INTERNETand registered toHP Inc. - The fifth is
137.164.35.76/30, netnameCALREN, registered toCENIC. - Routing was first seen in 2004.
- Twelve addresses were queried for reverse DNS and none returned a name.
Interesting
- A
/30is four addresses, two of them usable. Blocks that size are point-to-point links between two routers, and seeing one in a global routing table means an interconnect got announced alongside the networks it connects rather than staying inside somebody's internal routing. - The four larger blocks fit together inside a single contiguous run of
15.12space, so this is one allocation carved into pieces rather than four separate assignments. Whoever split it was working down from a larger block in halves and quarters. - The registrant is a manufacturer and the announcer is a carrier, which is the ordinary shape of managed enterprise networking: the customer owns the addresses, the carrier owns the routing, and the AS number belongs to whoever operates the path rather than whoever holds the space.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 5 downstream and 18 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS30016 | North American Telecommunications Corporation | 24 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-31, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1 prefixes · 4 addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 1 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS13979- Registry name
- ATT-IPFR
- Registrant
- AT&T Enterprises, LLC
- Abuse contact
- abuse@att.net
- Registered
- 1999-09-28
- Last changed
- 2025-03-18
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 2 with no ROA
- ROAs
- 25 authorising AS13979
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 2 announcements 2 other origin
- Route objects
- 1 naming AS13979
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 447 networks and 1,843 prefixes, as published 2026-11-01. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere