AS3561
CenturyLink Communications, LLC
Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Multiple-origin (MOAS) routing anomaly −12
- Isp allocation +5
- Trust score 58 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
About Qwest
Qwest Communications International, Inc. was a United States telecommunications carrier.
⚠ 15 MOAS prefixes — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS3561 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.
| Prefix | Origin ASNs | Last detected (UTC) |
|---|---|---|
| 23.27.55.0/24 | AS3561, AS26969 | 2026-07-18 11:37:44 |
| 23.27.115.0/24 | AS3561, AS26969 | 2026-07-18 11:37:44 |
| 209.73.140.0/24 | AS3561, AS18779 | 2026-07-18 11:37:44 |
| 216.172.136.0/24 | AS3561, AS18779 | 2026-07-18 11:37:44 |
| 209.73.148.0/24 | AS3561, AS18779 | 2026-07-18 11:37:44 |
| 209.73.147.0/24 | AS3561, AS18779 | 2026-07-18 11:37:44 |
| 205.186.65.0/24 | AS3561, AS26969 | 2026-07-17 19:22:38 |
| 209.73.130.0/24 | AS3561, AS18779 | 2026-07-17 19:22:38 |
| 103.11.68.0/22 | AS3561, AS60117 | 2026-07-17 19:22:38 |
| 172.252.207.0/24 | AS3561, AS18779 | 2026-07-17 19:22:38 |
| 216.172.147.0/24 | AS3561, AS18779 | 2026-07-17 19:22:38 |
| 45.38.199.0/24 | AS3561, AS18779 | 2026-07-17 17:37:37 |
| 45.39.160.0/24 | AS3561, AS10753, AS18779 | 2026-07-17 10:22:34 |
| 45.39.177.0/24 | AS3561, AS10753, AS18779 | 2026-07-17 10:22:34 |
| 45.39.193.0/24 | AS3561, AS10753, AS18779 | 2026-07-17 10:22:34 |
Network profile
Source: PeeringDB →AS3561 — global IP footprint
Cities where AS3561 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS3561 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 50.114.165.0/24 | 15,273 | 2026-07-18 10:52:00 |
| 63.128.88.0/24 | 12,382 | 2026-07-18 10:51:58 |
| 5.157.164.0/22 | 11,673 | 2026-07-18 10:52:00 |
| 199.6.20.0/24 | 11,544 | 2026-07-18 10:51:58 |
| 175.110.100.0/22 | 10,757 | 2026-07-18 10:52:00 |
| 23.230.243.0/24 | 10,731 | 2026-07-18 10:52:00 |
| 23.26.202.0/24 | 10,720 | 2026-07-18 10:52:00 |
| 64.29.72.0/22 | 10,686 | 2026-07-18 10:52:00 |
| 64.29.94.0/24 | 10,675 | 2026-07-18 10:52:00 |
| 91.237.44.0/22 | 10,650 | 2026-07-18 10:52:00 |
| 23.230.194.0/24 | 10,644 | 2026-07-18 10:52:00 |
| 50.117.100.0/24 | 10,638 | 2026-07-18 10:52:00 |
| 89.40.208.0/24 | 10,637 | 2026-07-18 10:52:00 |
| 62.216.64.0/21 | 10,628 | 2026-07-18 10:52:00 |
| 69.46.65.0/24 | 10,627 | 2026-07-18 10:52:00 |
| 50.117.64.0/24 | 10,611 | 2026-07-18 10:52:00 |
| 50.117.105.0/24 | 10,611 | 2026-07-18 10:52:00 |
| 50.117.73.0/24 | 10,611 | 2026-07-18 10:52:00 |
| 68.68.99.0/24 | 10,606 | 2026-07-18 10:52:00 |
| 81.161.4.0/22 | 10,605 | 2026-07-18 10:52:00 |
| 50.114.210.0/24 | 10,600 | 2026-07-18 10:52:00 |
| 64.29.89.0/24 | 10,591 | 2026-07-18 10:52:00 |
| 142.111.238.0/24 | 10,583 | 2026-07-18 10:52:00 |
| 50.114.173.0/24 | 10,572 | 2026-07-18 10:52:00 |
| 142.111.197.0/24 | 10,563 | 2026-07-18 10:52:00 |
| 109.166.48.0/21 | 10,559 | 2026-07-18 10:52:00 |
| 136.0.239.0/24 | 10,558 | 2026-07-18 10:52:00 |
| 50.114.32.0/24 | 10,556 | 2026-07-18 10:52:00 |
| 151.248.72.0/21 | 10,555 | 2026-07-18 10:52:00 |
| 50.117.28.0/24 | 10,551 | 2026-07-18 10:52:00 |
| 130.193.3.0/24 | 10,549 | 2026-07-18 10:52:00 |
| 104.252.60.0/24 | 10,543 | 2026-07-18 10:52:00 |
| 140.228.18.0/24 | 10,542 | 2026-07-18 10:52:00 |
| 45.38.49.0/24 | 10,538 | 2026-07-18 10:52:00 |
| 45.39.54.0/24 | 10,536 | 2026-07-18 10:52:00 |
| 216.39.37.0/24 | 10,536 | 2026-07-18 10:52:00 |
| 93.120.96.0/22 | 10,530 | 2026-07-18 10:52:00 |
| 151.248.80.0/21 | 10,526 | 2026-07-18 10:52:00 |
| 64.29.76.0/24 | 10,524 | 2026-07-18 10:52:00 |
| 141.140.9.0/24 | 10,523 | 2026-07-18 10:52:00 |
| 142.111.222.0/24 | 10,520 | 2026-07-18 10:52:00 |
| 162.33.165.0/24 | 10,518 | 2026-07-18 10:52:00 |
| 178.159.72.0/22 | 10,516 | 2026-07-18 10:52:00 |
| 178.159.64.0/22 | 10,513 | 2026-07-18 10:52:00 |
| 96.126.134.0/24 | 10,509 | 2026-07-18 10:52:00 |
| 149.19.158.0/23 | 10,506 | 2026-07-18 10:52:00 |
| 141.140.10.0/24 | 10,506 | 2026-07-18 10:52:00 |
| 185.200.236.0/22 | 10,506 | 2026-07-18 10:52:00 |
| 50.117.97.0/24 | 10,499 | 2026-07-18 10:52:00 |
| 176.118.80.0/21 | 10,497 | 2026-07-18 10:52:00 |
Showing top 50 of 779 announced prefixes by sample volume.
Frequently Asked Questions
What is AS3561?
AS3561 is an Autonomous System Number assigned to CenturyLink Communications, LLC. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS3561 announce?
AS3561 announces 6.63M IPv4 addresses distributed across 1,227 routed CIDR prefixes. The network is registered in United States.
Who operates AS3561?
AS3561 is operated by CenturyLink Communications, LLC. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS3561 registered in?
AS3561 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
