Autonomous system
AS3909 CENTURYLINK-LEGACY-QWEST-VDOC
Unclassified ARIN
IPv4 addresses
6.91K
4 prefixes
IPv6 prefixes
0
counted as prefixes, not addresses
Countries
1
mostly US
Flagged prefixes
0
none
Summary
CenturyLink Communications, LLC (Lumen)
isp legacy
A CenturyLink Communications, LLC autonomous system
(CENTURYLINK-LEGACY-QWEST-VDOC) inherited from Qwest, now part of Lumen
Technologies.
What it's used for
- Announcing a small set of prefixes — roughly 7,000 IPv4 addresses — behind Lumen's main backbone, [AS209](https://asn.ipinfo.app/AS209), which is its only upstream.
- Functionally a stub: a handful of routed blocks rather than a transit network in its own right.
Notable
- Despite the carrier name, this ASN is not a backbone. Lumen's actual transit business runs on [AS209](https://asn.ipinfo.app/AS209) and [AS3356](https://asn.ipinfo.app/AS3356); AS3909 carries a narrow slice of legacy Qwest routing.
- The
VDOCelement of the handle is not documented publicly and should not be read as identifying any particular customer or division.
Interesting
- Lumen holds a long tail of these legacy Qwest and CenturyLink ASNs, absorbed through decades of mergers. The naming convention —
CENTURYLINK-LEGACY-*— is the company labelling its own acquisition history in the registry.
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 | 4 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS3909- Registry name
- CENTURYLINK-LEGACY-QWEST-VDOC
- Registrant
- CenturyLink Communications, LLC
- Abuse contact
- abuse@aup.lumen.com
- Registered
- 1996-10-01
- Last changed
- 2018-10-04
- 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