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

AS209 · CENTURYLINK-US-LEGACY-QWEST

CenturyLink Communications LLC

AS209 is owned by CenturyLink Communications LLC and is a major transit provider, based 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.

  • 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
June 22, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
1 620 / 252
IPv6 Prefixes (raw / aggregated)
32 / 6
IPv4 Addresses
19 855 360
Largest IPv4 Prefix
/11 (2 097 152 addresses)
Largest IPv6 Prefix
/24
Geolocated Countries
🇺🇸 United States (31 794 912 IPs), 🇦🇺 Australia (13 936 IPs), 🇨🇦 Canada (1 472 IPs) and 10 more
Prefix Changed
June 13, 2026

Reputation

Reputation
Good — 60 flagged IPs out of 19 855 360 total (0.00%)

Connectivity Summary

Peers
24 networks exchanging traffic without transit
Downstream Customers
394 downstreams buying transit
Unclassified
4 unclassified BGP neighbors
Degree
422 unique BGP neighbors
Reach
564 networks in customer cone

Prefix Lists

IPv4 Prefixes (1 620 total)

  • 65.128.0.0/11 (2 097 152 addresses (/11 prefix))
  • 97.112.0.0/12 (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))
  • 174.16.0.0/12 (1 048 576 addresses (/12 prefix))
  • 75.160.0.0/12 (1 048 576 addresses (/12 prefix))
  • 71.32.0.0/13 (524 288 addresses (/13 prefix))
  • 184.96.0.0/13 (524 288 addresses (/13 prefix))
  • 71.48.0.0/13 (524 288 addresses (/13 prefix))
  • 76.0.0.0/13 (524 288 addresses (/13 prefix))
  • 67.0.0.0/13 (524 288 addresses (/13 prefix))
  • 67.128.0.0/13 (524 288 addresses (/13 prefix))
  • 184.0.0.0/13 (524 288 addresses (/13 prefix))
  • 67.232.0.0/13 (524 288 addresses (/13 prefix))
  • 65.100.0.0/14 (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))
  • 70.56.0.0/14 (262 144 addresses (/14 prefix))
  • 71.0.0.0/14 (262 144 addresses (/14 prefix))
  • 184.156.0.0/14 (262 144 addresses (/14 prefix))
  • 216.160.0.0/15 (131 072 addresses (/15 prefix))
  • 69.68.0.0/15 (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))
  • 72.160.0.0/15 (131 072 addresses (/15 prefix))
  • 67.40.0.0/15 (131 072 addresses (/15 prefix))
  • 207.108.0.0/15 (131 072 addresses (/15 prefix))
  • 72.164.0.0/15 (131 072 addresses (/15 prefix))
  • 74.4.0.0/15 (131 072 addresses (/15 prefix))
  • 207.224.0.0/15 (131 072 addresses (/15 prefix))
  • 75.120.0.0/15 (131 072 addresses (/15 prefix))
  • 68.176.0.0/15 (131 072 addresses (/15 prefix))
  • 99.194.0.0/15 (131 072 addresses (/15 prefix))
  • 65.40.0.0/15 (131 072 addresses (/15 prefix))
  • 209.180.0.0/15 (131 072 addresses (/15 prefix))
  • 67.76.0.0/15 (131 072 addresses (/15 prefix))
  • 204.132.0.0/15 (131 072 addresses (/15 prefix))
  • 204.98.0.0/16 (65 536 addresses (/16 prefix))
  • 199.117.0.0/16 (65 536 addresses (/16 prefix))
  • 67.42.0.0/16 (65 536 addresses (/16 prefix))
  • 138.210.0.0/16 (65 536 addresses (/16 prefix))
  • 204.49.0.0/16 (65 536 addresses (/16 prefix))
  • 144.163.0.0/16 (65 536 addresses (/16 prefix))
  • 162.104.0.0/16 (65 536 addresses (/16 prefix))
  • 72.166.0.0/16 (65 536 addresses (/16 prefix))
  • 204.134.0.0/16 (65 536 addresses (/16 prefix))
  • 67.148.0.0/16 (65 536 addresses (/16 prefix))
  • 168.103.0.0/16 (65 536 addresses (/16 prefix))

IPv6 Prefixes (32 total)

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