Autonomous system
AS209 CENTURYLINK-US-LEGACY-QWEST
Residential ARIN
Summary
Lumen / CenturyLink (Qwest legacy)
isp eyeball transit
A large US access and transit network now operated by Lumen Technologies, carrying the legacy Qwest / CenturyLink consumer and business broadband base.
What it's used for
- Residential and business internet (DSL and fibre) across the former Qwest territory in the western and central United States.
- Enterprise and wholesale connectivity under the Lumen/CenturyLink brand.
Notable
- This is an "eyeball" network — most IPs are subscribers, not servers.
- Distinct from AS3356 (the Level 3 backbone, also Lumen): 209 carries the CenturyLink/Qwest access side, 3356 is the global transit core. Both rolled up into Lumen after the CenturyLink–Level 3 merger.
Interesting
- Qwest was one of the 1990s fibre-boom long-haul carriers; its network survives inside Lumen today under this decades-old AS number.
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, 288 downstream and 313 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS3356 | Level 3 Parent, LLC | 96,166 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-10, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 4,904 prefixes · 15.70M addresses IPv6 92 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 4,996 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS209- Registry name
- CENTURYLINK-US-LEGACY-QWEST
- Registrant
- CenturyLink Communications, LLC
- Abuse contact
- abuse@aup.lumen.com
- Registered
- 1998-11-13
- Last changed
- 2018-10-04
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0.9% valid · 14 valid, 1,605 with no ROA
- ROAs
- 48 authorising AS209
- ASPA
- no ASPA record
- IRR
- 0.4% registered · 7 of 1,619 announcements 26 other origin
- Route objects
- 39 naming AS209
Reputation
Classification and threat
Residential Fixed-line consumer ISP. Addresses here are homes.
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: 431 networks and 1,775 prefixes, as published 2026-10-11. 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