Autonomous system
AS11396 TWC-ASN
Unclassified ARIN
Summary
Williams Information Technology LLC (The Williams Companies)
enterprise legacy
TWC-ASN is not Time Warner Cable. TWC here is The Williams Companies, the Tulsa, Oklahoma natural-gas pipeline and midstream energy operator, and the AS is held by its in-house IT arm, Williams Information Technology LLC. It carries 25 prefixes and roughly 24,800 addresses behind 7 observed neighbours.
What it's used for
Corporate enterprise networking for an energy company. Almost the entire inventory sits inside 151.142.0.0/16, a single contiguous legacy block registered in ARIN as TWC-NET to Williams Information Technology LLC, deaggregated into /19s, /20s and /24s. That pattern (one big block, sliced by site) is what a large multi-site corporate WAN looks like when it advertises regional chunks, not what an ISP or a hosting network looks like.
Reverse DNS settles it: sampled addresses resolve under williams.com, with names like oktulsbcv1.williams.com (Oklahoma / Tulsa, the company's headquarters city) alongside generic ip-151-142-x-y.williams.com host records. Registrant, announcer and rDNS zone all point at the same company.
Notable
Seven neighbours against 24,800 addresses is an enterprise multihoming posture, not a carrier. Williams provides no transit; it buys it, from a small number of upstreams, for a network that serves offices, control centres and pipeline operations across the US Gulf Coast, Appalachia and the Rockies.
Interesting
The handle is a live example of the "famous-looking name" trap: three letters that read as a household cable brand actually stand for a Fortune 500 pipeline company that has held its own /16 for decades.
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
8 upstream, 0 downstream and 8 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS3356 | Level 3 Parent, LLC | 814 |
| AS7922 | Comcast Cable Communications, LLC | 320 |
| AS33490 | Comcast Cable Communications, LLC | 119 |
| AS33660 | Comcast Cable Communications, LLC | 59 |
| AS15830 | Equinix (EMEA) Acquisition Enterprises B.V. | 58 |
| AS35280 | F5 Networks SARL | 58 |
| AS33287 | Comcast Cable Communications, LLC | 51 |
| AS33659 | Comcast Cable Communications, LLC | 8 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 13 prefixes · 24.83K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 13 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11396- Registry name
- TWC-ASN
- Registrant
- Williams Information Technology LLC
- Abuse contact
- domain-tech@williams.com
- Registered
- 1998-08-03
- Last changed
- 2012-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 25 with no ROA
- ROAs
- 0 authorising AS11396
- ASPA
- no ASPA record
- IRR
- 100% registered · 25 of 25 announcements
- Route objects
- 22 naming AS11396
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: 442 networks and 1,771 prefixes, as published 2026-10-15. 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