AS209 — CENTURYLINK-US-LEGACY-QWEST

Network type: residential

AS209 announces 4,335 IPv4 prefixes covering 15,703,552 addresses and 77 IPv6 prefixes.

About this network

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.

Announced prefixes

• 8.15.5.0/24
• 24.223.60.0/24
• 24.223.74.0/23
• 52.119.16.0/22
• 52.119.22.0/23
• 52.119.24.0/24
• 52.119.26.0/23
• 52.119.28.0/22
• 63.144.0.0/18
• 63.144.64.0/22
• 63.144.69.0/24
• 63.144.71.0/24
• 63.144.72.0/21
• 63.144.80.0/20
• 63.144.96.0/21
• 63.144.104.0/22
• 63.144.108.0/23
• 63.144.110.0/24
• 63.144.112.0/20
• 63.144.128.0/18
• 63.144.192.0/20
• 63.144.208.0/21
• 63.144.216.0/23
• 63.144.219.0/24
• 63.144.220.0/22
• 63.144.224.0/20
• 63.144.241.0/24
• 63.144.242.0/23
• 63.144.244.0/22
• 63.144.248.0/21
• 63.145.0.0/19
• 63.145.32.0/20
• 63.145.48.0/21
• 63.145.56.0/23
• 63.145.58.0/24
• 63.145.60.0/23
• 63.145.62.0/24
• 63.145.64.0/19
• 63.145.96.0/21
• 63.145.104.0/22
• 63.145.108.0/23
• 63.145.110.0/24
• 63.145.112.0/22
• 63.145.116.0/24
• 63.145.118.0/23
• 63.145.120.0/21
• 63.145.128.0/21
• 63.145.136.0/22
• 63.145.140.0/23
• 63.145.143.0/24
• 63.145.144.0/20
• 63.145.160.0/19
• 63.145.192.0/22
• 63.145.196.0/23
• 63.145.198.0/24
• 63.145.200.0/24
• 63.145.202.0/23
• 63.145.204.0/22
• 63.145.208.0/20
• 63.145.224.0/20
• 63.145.240.0/22
• 63.145.244.0/23
• 63.145.248.0/21
• 63.146.0.0/20
• 63.146.16.0/22
• 63.146.21.0/24
• 63.146.22.0/23
• 63.146.24.0/22
• 63.146.28.0/23
• 63.146.31.0/24
• 63.146.32.0/22
• 63.146.36.0/23
• 63.146.39.0/24
• 63.146.40.0/21
• 63.146.48.0/20
• 63.146.64.0/20
• 63.146.80.0/23
• 63.146.82.0/24
• 63.146.84.0/22
• 63.146.88.0/21
• 63.146.97.0/24
• 63.146.98.0/23
• 63.146.100.0/22
• 63.146.104.0/21
• 63.146.112.0/20
• 63.146.128.0/20
• 63.146.144.0/21
• 63.146.152.0/24
• 63.146.154.0/23
• 63.146.156.0/22
• 63.146.160.0/19
• 63.146.192.0/22
• 63.146.196.0/23
• 63.146.198.0/24
• 63.146.200.0/21
• 63.146.208.0/20
• 63.146.224.0/20
• 63.146.240.0/22
• 63.146.245.0/24
• 63.146.246.0/23

and 4,312 more.

Upstream networks

• AS3356 Level 3 Parent, LLC

Downstream networks

• AS22561 CenturyLink Communications, LLC
• AS396908 Laurens Technologies Internet Services
• AS14921 CenturyLink Communications, LLC
• AS18530 Isomedia, Inc.
• AS17402 CenturyLink Communications, LLC
• AS54427 NetTally, Inc
• AS297 National Aeronautics and Space Administration
• AS11255 Screamin' Banshee Technologies
• AS64200 VIVID-HOSTING LLC
• AS30221 T3 Communications, Inc.
• AS32083 Omnispring, LLC
• AS64280 Palo Alto Networks, Inc
• AS400988 Salt Lake County
• AS13485 Grand Canyon University
• AS3743 Cleveland Cliffs Steel LLC
• AS40766 Equinox Payments
• AS17385 Orbitel Communications, LLC
• AS22522 United Launch Alliance, LLC
• AS11857 Money Services, Inc.
• AS3909 CenturyLink Communications, LLC
• AS16417 Cisco Systems Ironport Division
• AS13866 Computer Country
• AS6223 CenturyLink Communications, LLC
• AS4015 CenturyLink Communications, LLC
• AS29842 East Tennessee State University

Adjacent networks

• AS3356 Level 3 Parent, LLC
• AS22561 CenturyLink Communications, LLC
• AS297 National Aeronautics and Space Administration
• AS18530 Isomedia, Inc.
• AS396908 Laurens Technologies Internet Services
• AS6223 CenturyLink Communications, LLC
• AS14921 CenturyLink Communications, LLC
• AS17402 CenturyLink Communications, LLC
• AS54427 NetTally, Inc
• AS6224 CenturyLink Communications, LLC
• AS30221 T3 Communications, Inc.
• AS11255 Screamin' Banshee Technologies
• AS4296 CenturyLink Communications, LLC
• AS4297 CenturyLink Communications, LLC
• AS64200 VIVID-HOSTING LLC
• AS32083 Omnispring, LLC
• AS64280 Palo Alto Networks, Inc
• AS400988 Salt Lake County
• AS3743 Cleveland Cliffs Steel LLC
• AS13485 Grand Canyon University
• AS40766 Equinox Payments
• AS22522 United Launch Alliance, LLC
• AS17385 Orbitel Communications, LLC
• AS11857 Money Services, Inc.
• AS3909 CenturyLink Communications, LLC

Routing security

• RPKI: 14 valid, 0 invalid and 1,606 not-found announcements; 48 ROAs.
• ASPA: none published.
• IRR: 0% of announcements registered; 39 route objects.
• Listed in as-sets: AS-14230-UPSTREAM, AS-398022-ALL, AS-40300-ISPS, AS-40300-IX-CUSTOMERS, AS-AS33274-TRANSIT-PEERS, AS-AS394306-TRANSIT-PEERS, AS-AS394307-TRANSIT-PEERS, AS-ASAVIE, AS-CITYO-33, AS-CLGW, AS-COMPUTEARIZONA, AS-COMPUTEAZ, AS-CTBC-CUSTOMERS64, AS-CUSTOMERS-SCDI-3, AS-EBAY-TRANSIT, AS-H5DATA-AS-SETATL01, AS-HKTPEER, AS-ORMAT, AS-SET-NGENA, AS-STRATUS-TRANSIT, AS-VES-DS, AS-XO-P, AS10886:AS-ISP-PROV, AS13765:AS-UPSTREAM, AS16654:AS-PEERS.