Autonomous system
AS6431 ATT-RESEARCH
Unclassified ARIN
Summary
AT&T Labs Research
enterprise research legacy
ATT-RESEARCH — the research arm of AT&T, registered to AT&T Enterprises, LLC in
Dallas, Texas. This is a corporate R&D network, not AT&T's consumer broadband
eyeball network.
What it's used for
- Networking for AT&T's research organisation, historically home of the
research.att.comhosts. Its main prefixes are two /17s carved out of135.197.0.0–135.208.255.255, a legacy AT&T Class-B range, alongside a few small blocks from AT&T's12.0.0.0/8. - Despite announcing around 200k IPv4 addresses, this is internal corporate and research space rather than subscriber pools.
Notable
- AT&T Labs Research descends from the part of Bell Labs that stayed with AT&T after the 1996 split that created Lucent — a lineage that includes foundational work in computing and networking.
- The ARIN record dates to April 1996, the same month AT&T's post-split structure was taking shape, and sits in the sequential run of mid-6400s assignments.
Interesting
- A useful reminder that a big carrier's address space is spread across many ASNs with very different purposes: AT&T's broadband subscribers live behind an entirely different AS from this one.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Address space
Summary
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 14 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS6431- Registry name
- ATT-RESEARCH
- Registrant
- AT&T Enterprises, LLC
- Abuse contact
- abuse@att.net
- Registered
- 1996-04-12
- Last changed
- 2025-03-18
- Status
- active
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
No IC3 indicators Nothing from the FBI IC3 feed.
Threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere