$ query “AS3561” --type=asn → 1 result(s)

AS3561 · CENTURYLINK-LEGACY-SAVVIS

CenturyLink Communications LLC

AS3561 is operated by CenturyLink Communications LLC and serves as a mid-size transit provider, based in the United States since 1998. The system announces an impressive 8.9 million IPv4 addresses, including a /13, and supports IPv6. Its primary geographic footprint is in the United States, with additional presence in Canada and Hong Kong SAR China, and smaller footprints in 32 additional countries. Prefix announcements for this AS were recently updated.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • Pioneer — Registered before the year 2000

Basic Information

Country
🇺🇸 United States
Category
Hosting
Network Role
Mid-size Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
October 07, 1998
Last Changed
March 04, 2026
Last Seen
April 29, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
657 / 341
IPv6 Prefixes (raw / aggregated)
2 / 2
IPv4 Addresses
8 919 808
Largest IPv4 Prefix
/13 (524 288 addresses)
Largest IPv6 Prefix
/46
Geolocated Countries
🇺🇸 United States (9 986 336 IPs), 🇨🇦 Canada (76 960 IPs), 🇭🇰 Hong Kong SAR China (66 816 IPs) and 32 more
Prefix Changed
April 29, 2026

Reputation

Reputation
Good — 1 flagged IPs out of 8 919 808 total (0.00%)

Connectivity Summary

Upstream Providers
4 upstreams providing transit
Peers
2 networks exchanging traffic without transit
Downstream Customers
57 downstreams buying transit
Degree
63 unique BGP neighbors
Reach
58 networks in customer cone

Upstream Providers (4)

  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS3549 — LVLT-3549
  • AS209 — CENTURYLINK-US-LEGACY-QWEST
  • AS3910 — CENTURYLINK-EUROPE-LEGACY-QWEST

Prefix Lists

IPv4 Prefixes (657 total)

  • 208.144.0.0/13 (524 288 addresses (/13 prefix))
  • 216.32.0.0/14 (262 144 addresses (/14 prefix))
  • 208.152.0.0/14 (262 144 addresses (/14 prefix))
  • 206.100.0.0/14 (262 144 addresses (/14 prefix))
  • 208.140.0.0/14 (262 144 addresses (/14 prefix))
  • 64.240.0.0/14 (262 144 addresses (/14 prefix))
  • 216.88.0.0/14 (262 144 addresses (/14 prefix))
  • 208.164.0.0/15 (131 072 addresses (/15 prefix))
  • 208.160.0.0/15 (131 072 addresses (/15 prefix))
  • 208.134.0.0/15 (131 072 addresses (/15 prefix))
  • 206.26.0.0/15 (131 072 addresses (/15 prefix))
  • 205.218.0.0/15 (131 072 addresses (/15 prefix))
  • 204.70.0.0/15 (131 072 addresses (/15 prefix))
  • 208.128.0.0/15 (131 072 addresses (/15 prefix))
  • 208.170.0.0/15 (131 072 addresses (/15 prefix))
  • 66.100.0.0/15 (131 072 addresses (/15 prefix))
  • 208.136.0.0/15 (131 072 addresses (/15 prefix))
  • 205.138.0.0/15 (131 072 addresses (/15 prefix))
  • 63.128.0.0/15 (131 072 addresses (/15 prefix))
  • 207.48.0.0/15 (131 072 addresses (/15 prefix))
  • 207.0.0.0/15 (131 072 addresses (/15 prefix))
  • 206.156.0.0/15 (131 072 addresses (/15 prefix))
  • 208.158.0.0/15 (131 072 addresses (/15 prefix))
  • 206.30.0.0/15 (131 072 addresses (/15 prefix))
  • 206.152.0.0/16 (65 536 addresses (/16 prefix))
  • 207.3.0.0/16 (65 536 addresses (/16 prefix))
  • 204.189.0.0/16 (65 536 addresses (/16 prefix))
  • 64.14.0.0/16 (65 536 addresses (/16 prefix))
  • 206.79.0.0/16 (65 536 addresses (/16 prefix))
  • 208.156.0.0/16 (65 536 addresses (/16 prefix))
  • 208.139.0.0/16 (65 536 addresses (/16 prefix))
  • 63.137.0.0/16 (65 536 addresses (/16 prefix))
  • 208.162.0.0/16 (65 536 addresses (/16 prefix))
  • 206.25.0.0/16 (65 536 addresses (/16 prefix))
  • 209.67.0.0/16 (65 536 addresses (/16 prefix))
  • 206.129.0.0/16 (65 536 addresses (/16 prefix))
  • 208.133.0.0/16 (65 536 addresses (/16 prefix))
  • 206.142.0.0/16 (65 536 addresses (/16 prefix))
  • 206.150.0.0/16 (65 536 addresses (/16 prefix))
  • 208.130.0.0/16 (65 536 addresses (/16 prefix))
  • 205.216.0.0/16 (65 536 addresses (/16 prefix))
  • 207.149.0.0/16 (65 536 addresses (/16 prefix))
  • 207.124.0.0/16 (65 536 addresses (/16 prefix))
  • 209.1.0.0/16 (65 536 addresses (/16 prefix))
  • 209.176.0.0/16 (65 536 addresses (/16 prefix))
  • 208.172.0.0/16 (65 536 addresses (/16 prefix))
  • 207.82.0.0/16 (65 536 addresses (/16 prefix))
  • 207.51.0.0/16 (65 536 addresses (/16 prefix))
  • 167.215.0.0/16 (65 536 addresses (/16 prefix))
  • 206.155.0.0/16 (65 536 addresses (/16 prefix))
  • and 291 more

IPv6 Prefixes (2 total)

  • 2001:460:78::/46
  • 2001:460:100::/46