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

AS209 · CENTURYLINK-US-LEGACY-QWEST

CenturyLink Communications LLC

AS209 is operated by CenturyLink Communications LLC and serves as a major transit provider, registered in the United States since 1998. The system announces a whopping 19.8 million IPv4 addresses (0.54% of routable IPv4 space), including a /11, and supports IPv6. Its primary geographic footprint is in the United States, with additional presence in the U.S. Virgin Islands and Canada, and smaller footprints in 15 additional countries. This AS has recently updated its prefix announcements.

  • 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
October 21, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
1 588 / 244
IPv6 Prefixes (raw / aggregated)
32 / 6
IPv4 Addresses
19 845 632
Largest IPv4 Prefix
/11 (2 097 152 addresses)
Largest IPv6 Prefix
/24
Geolocated Countries
🇺🇸 United States (19 838 704 IPs), 🇻🇮 U.S. Virgin Islands (3 072 IPs), 🇨🇦 Canada (1 712 IPs) and 15 more
Prefix Changed
October 22, 2026

Reputation

Reputation
Good — 73 flagged IPs out of 19 845 632 total (0.00%)

Connectivity Summary

Peers
23 networks exchanging traffic without transit
Downstream Customers
330 downstreams buying transit
Unclassified
17 unclassified BGP neighbors
Degree
370 unique BGP neighbors
Reach
369 networks in customer cone

Prefix Lists

IPv4 Prefixes (1 588 total)

  • 65.128.0.0/11 (2 097 152 addresses (/11 prefix))
  • 63.144.0.0/12 (1 048 576 addresses (/12 prefix))
  • 63.224.0.0/12 (1 048 576 addresses (/12 prefix))
  • 65.112.0.0/12 (1 048 576 addresses (/12 prefix))
  • 71.208.0.0/12 (1 048 576 addresses (/12 prefix))
  • 75.160.0.0/12 (1 048 576 addresses (/12 prefix))
  • 97.112.0.0/12 (1 048 576 addresses (/12 prefix))
  • 174.16.0.0/12 (1 048 576 addresses (/12 prefix))
  • 67.0.0.0/13 (524 288 addresses (/13 prefix))
  • 67.128.0.0/13 (524 288 addresses (/13 prefix))
  • 67.232.0.0/13 (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))
  • 76.0.0.0/13 (524 288 addresses (/13 prefix))
  • 184.0.0.0/13 (524 288 addresses (/13 prefix))
  • 184.96.0.0/13 (524 288 addresses (/13 prefix))
  • 65.100.0.0/14 (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))
  • 205.168.0.0/14 (262 144 addresses (/14 prefix))
  • 208.44.0.0/14 (262 144 addresses (/14 prefix))
  • 65.40.0.0/15 (131 072 addresses (/15 prefix))
  • 67.40.0.0/15 (131 072 addresses (/15 prefix))
  • 67.76.0.0/15 (131 072 addresses (/15 prefix))
  • 68.176.0.0/15 (131 072 addresses (/15 prefix))
  • 69.68.0.0/15 (131 072 addresses (/15 prefix))
  • 72.160.0.0/15 (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))
  • 75.120.0.0/15 (131 072 addresses (/15 prefix))
  • 99.194.0.0/15 (131 072 addresses (/15 prefix))
  • 204.132.0.0/15 (131 072 addresses (/15 prefix))
  • 207.108.0.0/15 (131 072 addresses (/15 prefix))
  • 207.118.0.0/15 (131 072 addresses (/15 prefix))
  • 207.224.0.0/15 (131 072 addresses (/15 prefix))
  • 209.180.0.0/15 (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))
  • 66.77.0.0/16 (65 536 addresses (/16 prefix))
  • 67.42.0.0/16 (65 536 addresses (/16 prefix))
  • 67.148.0.0/16 (65 536 addresses (/16 prefix))
  • 69.29.0.0/16 (65 536 addresses (/16 prefix))
  • 69.34.0.0/16 (65 536 addresses (/16 prefix))
  • 69.179.0.0/16 (65 536 addresses (/16 prefix))
  • 72.166.0.0/16 (65 536 addresses (/16 prefix))
  • 98.125.0.0/16 (65 536 addresses (/16 prefix))
  • 138.210.0.0/16 (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))

IPv6 Prefixes (32 total)

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