Autonomous system
AS11133 SORENSON-99
Unclassified ARIN
Summary
Sorenson Communications, Inc.
enterprise legacy
SORENSON-99 is held by Sorenson Communications, Inc., the Salt Lake City company that operates Sorenson VRS — the largest US Video Relay Service, which connects Deaf and hard-of-hearing users to hearing callers through ASL interpreters over videophones. VRS providers are funded through the FCC's Telecommunications Relay Services fund under the ADA.
What it's used for
The private network of a single communications company. RIS observes 10 IPv4 prefixes totalling 2,560 addresses and no IPv6 — ten /24s, most of them clustered in 209.169.224.0/19-adjacent space (209.169.226, .230, .231, .238, .240, .243, .244) with three more in 65.37.x.
Every one of those prefixes is registered to SORENSONVRS, Sorenson's own ARIN object. Self-registered space announced by the holder's own AS: a real operator on its own inventory, with no third-party blocks and nothing that resembles a leasing arrangement.
Three observed BGP neighbours is a service company's edge, not a carrier's. Sorenson buys transit; it does not sell it.
Notable
The interesting thing here is what the network isn't. Sorenson is a telecommunications provider in the regulatory sense — it operates a relay service under FCC rules — and it puts videophones in end users' homes. But the routed footprint is only 2,560 addresses, which is nowhere near enough to number a subscriber base. Its endpoints therefore live on ordinary consumer broadband, reaching Sorenson's platform over the public internet; the AS carries the platform side of that relationship — call routing, interpreter centres, and the corporate estate.
That distinction matters for classification. A company can be a phone company by regulation and an enterprise by network shape, and the routing table is the honest witness: this is a mid-size private network, not an access network.
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.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-19, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 9 prefixes · 2.56K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 9 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11133- Registry name
- SORENSON-99
- Registrant
- Sorenson Communications, Inc.
- Abuse contact
- dns-admin@sorenson.com
- Registered
- 2007-05-17
- Last changed
- 2013-11-06
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 10 with no ROA
- ROAs
- 0 authorising AS11133
- ASPA
- no ASPA record
- IRR
- 100% registered · 10 of 10 announcements
- Route objects
- 3 naming AS11133
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 1,783 prefixes, as published 2026-10-20. 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