$ query “AS209” --type=asn → 1 result(s)

AS209 · CENTURYLINK-US-LEGACY-QWEST

CenturyLink Communications LLC

AS209 belongs to CenturyLink Communications LLC and is a major transit provider, registered in the United States since 1998. The system announces a whopping 19.9 million IPv4 addresses (0.54% of routable IPv4 space), including a /11, and supports IPv6. Most of its address space is geolocated to the United States, with additional presence in Australia and Canada, and smaller footprints in 10 additional countries. Prefix announcements for this AS were recently updated.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • Space Overlord — Over 10 million IPv4 addresses
  • Pioneer — Registered before the year 2000

Basic Information

Country
🇺🇸 United States
Category
Internet Service Provider
Network Role
Major Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
November 13, 1998
Last Changed
April 01, 2026
Last Seen
April 28, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
1 622 / 254
IPv6 Prefixes (raw / aggregated)
32 / 6
IPv4 Addresses
19 856 640
Largest IPv4 Prefix
/11 (2 097 152 addresses)
Largest IPv6 Prefix
/24
Geolocated Countries
🇺🇸 United States (31 796 064 IPs), 🇦🇺 Australia (13 936 IPs), 🇨🇦 Canada (1 472 IPs) and 10 more
Prefix Changed
April 25, 2026

Reputation

Reputation
Good — 69 flagged IPs out of 19 856 640 total (0.00%)

Connectivity Summary

Peers
25 networks exchanging traffic without transit
Downstream Customers
417 downstreams buying transit
Unclassified
7 unclassified BGP neighbors
Degree
449 unique BGP neighbors
Reach
589 networks in customer cone

Prefix Lists

IPv4 Prefixes (1 622 total)

  • 65.128.0.0/11 (2 097 152 addresses (/11 prefix))
  • 174.16.0.0/12 (1 048 576 addresses (/12 prefix))
  • 71.208.0.0/12 (1 048 576 addresses (/12 prefix))
  • 65.112.0.0/12 (1 048 576 addresses (/12 prefix))
  • 63.144.0.0/12 (1 048 576 addresses (/12 prefix))
  • 63.224.0.0/12 (1 048 576 addresses (/12 prefix))
  • 97.112.0.0/12 (1 048 576 addresses (/12 prefix))
  • 75.160.0.0/12 (1 048 576 addresses (/12 prefix))
  • 76.0.0.0/13 (524 288 addresses (/13 prefix))
  • 67.232.0.0/13 (524 288 addresses (/13 prefix))
  • 184.0.0.0/13 (524 288 addresses (/13 prefix))
  • 67.128.0.0/13 (524 288 addresses (/13 prefix))
  • 184.96.0.0/13 (524 288 addresses (/13 prefix))
  • 71.32.0.0/13 (524 288 addresses (/13 prefix))
  • 71.48.0.0/13 (524 288 addresses (/13 prefix))
  • 67.0.0.0/13 (524 288 addresses (/13 prefix))
  • 70.56.0.0/14 (262 144 addresses (/14 prefix))
  • 208.44.0.0/14 (262 144 addresses (/14 prefix))
  • 205.168.0.0/14 (262 144 addresses (/14 prefix))
  • 65.100.0.0/14 (262 144 addresses (/14 prefix))
  • 184.156.0.0/14 (262 144 addresses (/14 prefix))
  • 71.0.0.0/14 (262 144 addresses (/14 prefix))
  • 67.40.0.0/15 (131 072 addresses (/15 prefix))
  • 69.68.0.0/15 (131 072 addresses (/15 prefix))
  • 207.224.0.0/15 (131 072 addresses (/15 prefix))
  • 216.160.0.0/15 (131 072 addresses (/15 prefix))
  • 216.206.0.0/15 (131 072 addresses (/15 prefix))
  • 207.118.0.0/15 (131 072 addresses (/15 prefix))
  • 209.180.0.0/15 (131 072 addresses (/15 prefix))
  • 72.160.0.0/15 (131 072 addresses (/15 prefix))
  • 207.108.0.0/15 (131 072 addresses (/15 prefix))
  • 65.40.0.0/15 (131 072 addresses (/15 prefix))
  • 68.176.0.0/15 (131 072 addresses (/15 prefix))
  • 72.164.0.0/15 (131 072 addresses (/15 prefix))
  • 204.132.0.0/15 (131 072 addresses (/15 prefix))
  • 74.4.0.0/15 (131 072 addresses (/15 prefix))
  • 67.76.0.0/15 (131 072 addresses (/15 prefix))
  • 75.120.0.0/15 (131 072 addresses (/15 prefix))
  • 99.194.0.0/15 (131 072 addresses (/15 prefix))
  • 162.104.0.0/16 (65 536 addresses (/16 prefix))
  • 209.211.0.0/16 (65 536 addresses (/16 prefix))
  • 209.3.0.0/16 (65 536 addresses (/16 prefix))
  • 67.42.0.0/16 (65 536 addresses (/16 prefix))
  • 204.49.0.0/16 (65 536 addresses (/16 prefix))
  • 209.26.0.0/16 (65 536 addresses (/16 prefix))
  • 204.131.0.0/16 (65 536 addresses (/16 prefix))
  • 72.166.0.0/16 (65 536 addresses (/16 prefix))
  • 144.163.0.0/16 (65 536 addresses (/16 prefix))
  • 168.103.0.0/16 (65 536 addresses (/16 prefix))
  • 67.148.0.0/16 (65 536 addresses (/16 prefix))
  • and 204 more

IPv6 Prefixes (32 total)

  • 2602::/24
  • 2001:428::/32
  • 2001:460::/32
  • 2604:8c0::/32
  • 2606:5000::/32
  • 2620:13d:2060::/46