Autonomous System

AS203

Level 3 Parent, LLC

Level 3 Parent, LLC United States 🌐 level3.com

Announced IPs

307,712

CIDR prefixes

104

ASN

AS203

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.

58/100

Caution

How this score is built

Baseline (neutral) 65
Active-threat / abuse risk −12
Isp allocation +5
Trust score 58 / 100

Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →

About Level 3 Communications

Level 3 Communications, Inc. was an American multinational telecommunications and internet service provider company headquartered in Broomfield, Colorado.

Founded

1985

Headquarters

Frankfurt

Industry

telecommunications industry

Official website ↗ Summary from Wikipedia, CC BY-SA 4.0 · Data from Wikidata

⚠ 24 MOAS prefixes — multiple origin ASNs detected

All MOAS anomalies →

A previously stable prefix originated by AS203 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)
156.93.228.0/24	AS203, AS10695	2026-09-10 22:40:48
143.199.145.0/24	AS203, AS21680	2026-09-10 22:40:48
63.144.218.0/24	AS203, AS22587	2026-09-10 22:40:48
63.150.74.0/23	AS203, AS22587	2026-09-10 22:40:48
170.46.132.0/23	AS203, AS18697	2026-09-10 22:40:48
170.46.162.0/24	AS203, AS18697	2026-09-10 22:40:48
143.199.96.0/24	AS203, AS21680	2026-09-10 22:40:48
148.59.168.0/24	AS203, AS26845	2026-09-10 22:40:48
170.46.0.0/16	AS203, AS18697	2026-09-10 22:40:48
65.222.131.0/24	AS203, AS46909	2026-09-10 22:40:48
65.240.184.0/23	AS203, AS22587	2026-09-10 22:40:48
170.46.200.0/24	AS203, AS18697	2026-09-10 22:40:48
205.166.171.0/24	AS203, AS26845	2026-09-10 22:40:48
170.46.150.0/24	AS203, AS18697	2026-09-10 22:40:48
204.17.219.0/24	AS203, AS23015	2026-09-10 22:40:48

Showing the 15 most recently detected of 24 MOAS prefixes. Many multi-origin prefixes on large networks are benign (anycast); see all MOAS anomalies.

Top CIDR ranges

CIDR	IPs	PTR Density	Organization	Country	State	City
149.21.0.0/16	65.5K	0.0%	McKesson Corp.	US	—	—
156.42.0.0/16	65.5K	0.4%	Level 3 Parent, LLC	US	Arizona	Phoenix
170.46.0.0/16	65.5K	0.0%	Level 3 Parent, LLC	US	Vermont	Rutland
143.112.0.0/17	32.8K	0.0%	McKesson Corp.	US	Virginia	Woodbridge
156.42.128.0/17	32.8K	0.0%	Level 3 Parent, LLC	US	Arizona	Phoenix
143.112.128.0/18	16.4K	0.0%	Level 3 Parent, LLC	US	Nevada	Henderson
156.42.64.0/18	16.4K	0.0%	Level 3 Parent, LLC	US	Arizona	Phoenix
156.42.128.0/18	16.4K	0.0%	Level 3 Parent, LLC	US	Arizona	Phoenix
143.112.160.0/19	8.2K	0.0%	Level 3 Parent, LLC	US	—	—
143.112.192.0/19	8.2K	0.0%	Level 3 Parent, LLC	US	—	—
156.42.32.0/19	8.2K	0.0%	Level 3 Parent, LLC	US	Arizona	Phoenix
156.42.224.0/19	8.2K	0.0%	Level 3 Parent, LLC	US	—	—
161.209.192.0/19	8.2K	0.0%	Level 3 Parent, LLC	US	California	Long Beach
143.112.144.0/20	4.1K	0.0%	Level 3 Parent, LLC	US	Nevada	Henderson
143.112.224.0/20	4.1K	0.0%	Level 3 Parent, LLC	US	—	—
161.209.96.0/20	4.1K	0.0%	Level 3 Parent, LLC	US	—	—
206.203.96.0/20	4.1K	0.0%	McKesson Corp.	US	—	—
216.163.240.0/20	4.1K	5.2%	Level 3 Parent, LLC	US	New Jersey	Chatham
143.112.136.0/21	2.0K	0.0%	Level 3 Parent, LLC	US	—	—
143.112.240.0/21	2.0K	0.0%	Level 3 Parent, LLC	US	—	—
156.42.208.0/21	2.0K	0.0%	Level 3 Parent, LLC	US	—	—
161.209.96.0/21	2.0K	0.0%	Level 3 Parent, LLC	US	—	—
206.203.112.0/21	2.0K	0.0%	McKesson Corp.	US	—	—
216.235.200.0/21	2.0K	1.9%	Level 3 Parent, LLC	US	—	—
63.128.0.0/22	1.0K	0.0%	Level 3 Parent, LLC	US	—	—
63.128.8.0/22	1.0K	0.0%	Level 3 Parent, LLC	US	—	—
143.112.132.0/22	1.0K	0.0%	Level 3 Parent, LLC	US	—	—
143.112.248.0/22	1.0K	0.0%	Level 3 Parent, LLC	US	—	—
205.139.104.0/22	1.0K	2.7%	Level 3 Parent, LLC	US	—	—
206.203.68.0/22	1.0K	0.0%	Level 3 Parent, LLC	US	—	—
206.203.84.0/22	1.0K	0.0%	McKesson Corp.	US	—	—
206.203.124.0/22	1.0K	0.0%	McKesson Corp.	US	—	—
206.227.192.0/22	1.0K	0.0%	Level 3 Parent, LLC	US	—	—
206.227.208.0/22	1.0K	0.0%	Level 3 Parent, LLC	US	—	—
209.67.132.0/22	1.0K	0.0%	Level 3 Parent, LLC	US	—	—
209.67.136.0/22	1.0K	0.0%	Level 3 Parent, LLC	US	—	—
209.164.192.0/22	1.0K	3.8%	Level 3 Parent, LLC	US	—	—
63.150.74.0/23	512	16.2%	Global Payments, Inc.	US	—	—
64.241.120.0/23	512	0.0%	Level 3 Parent, LLC	US	—	—
65.240.184.0/23	512	8.6%	Global Payments, Inc.	US	—	—
143.112.252.0/23	512	0.0%	Level 3 Parent, LLC	US	—	—
143.199.140.0/23	512	0.0%	Level 3 Parent, LLC	US	—	—
204.153.154.0/23	512	2.1%	Level 3 Parent, LLC	US	Arizona	Peoria
205.139.102.0/23	512	0.0%	Level 3 Parent, LLC	US	—	—
206.203.76.0/23	512	0.0%	Level 3 Parent, LLC	US	—	—
206.203.82.0/23	512	0.0%	McKesson Corp.	US	—	—
206.203.94.0/23	512	0.0%	McKesson Corp.	US	—	—
206.203.120.0/23	512	0.0%	McKesson Corp.	US	—	—
206.227.216.0/23	512	0.0%	Level 3 Parent, LLC	US	—	—
206.227.220.0/23	512	0.0%	Level 3 Parent, LLC	US	—	—
206.227.226.0/23	512	0.0%	Level 3 Parent, LLC	US	—	—
209.164.204.0/23	512	0.0%	Level 3 Parent, LLC	US	—	—
209.164.208.0/23	512	5.5%	Level 3 Parent, LLC	US	—	—
209.164.220.0/23	512	4.1%	Level 3 Parent, LLC	US	—	—
8.7.155.0/24	256	0.4%	Level 3 Parent, LLC	US	—	—
8.15.229.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
8.18.63.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
8.20.69.0/24	256	5.5%	Level 3 Parent, LLC	US	—	—
8.25.26.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
8.44.205.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
38.107.240.0/24	256	0.0%	Level 3 Parent, LLC	US	Texas	Dallas
62.67.222.0/24	256	0.0%	Level 3 Parent, LLC	GB	—	—
63.106.6.0/24	256	9.0%	Global Payments, Inc.	US	—	—
63.128.7.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
63.128.12.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
63.128.14.0/24	256	0.8%	Level 3 Parent, LLC	US	Massachusetts	Boston
63.128.20.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
63.128.24.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
63.144.218.0/24	256	15.6%	Global Payments, Inc.	US	—	—
63.175.205.0/24	256	0.0%	NDCHealth Corporation	US	Vermont	Burlington
63.233.90.0/24	256	99.2%	Dougherty Financial Group LLC	US	—	—
64.22.148.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
64.208.127.0/24	256	8.2%	Level 3 Parent, LLC	US	—	—
64.209.141.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
64.210.246.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
65.222.131.0/24	256	93.8%	Level 3 Parent, LLC	US	Pennsylvania	Philadelphia
66.194.187.0/24	256	37.9%	Level 3 Parent, LLC	US	—	—
128.177.179.0/24	256	7.8%	Level 3 Parent, LLC	US	Maryland	Crofton
143.112.254.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
143.199.28.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
143.199.96.0/24	256	0.0%	Level 3 Parent, LLC	US	Massachusetts	Medfield
143.199.109.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
143.199.135.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
143.199.145.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
143.199.222.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
148.59.168.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
148.59.169.0/24	256	0.8%	Level 3 Parent, LLC	US	—	—
158.120.127.0/24	256	0.4%	Level 3 Parent, LLC	US	Colorado	Colorado Springs
161.209.111.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
161.209.225.0/24	256	0.8%	Level 3 Parent, LLC	US	—	—
170.22.90.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
170.203.252.0/24	256	6.3%	Level 3 Parent, LLC	US	—	—
189.125.51.0/24	256	0.0%	Level 3 Parent, LLC	BR	—	—
192.26.214.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
192.42.110.0/24	256	7.8%	Level 3 Parent, LLC	US	District of Columbia	Washington
192.147.2.0/24	256	0.4%	Level 3 Parent, LLC	US	—	—
198.135.250.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
198.200.148.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—
204.17.219.0/24	256	0.0%	Cambridge Mercantile Corp.	US	—	—
204.146.159.0/24	256	0.0%	Level 3 Parent, LLC	US	—	—

BGP Announced Prefixes

Live BGP anomalies →

Prefixes AS203 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
66.193.107.0/24	17,570	2026-09-05 03:35:34
192.26.214.0/24	11,905	2026-09-10 22:11:37
64.210.246.0/24	9,956	2026-09-10 22:11:48
204.146.159.0/24	9,601	2026-09-10 12:50:29
143.199.28.0/24	8,847	2026-09-10 22:11:37
143.199.135.0/24	8,840	2026-09-10 22:11:32
143.199.222.0/24	8,839	2026-09-10 22:11:37
148.59.168.0/24	8,833	2026-09-10 22:11:48
143.199.109.0/24	8,806	2026-09-10 22:11:48
65.121.54.0/24	8,400	2026-09-09 06:55:35
143.199.140.0/23	8,006	2026-09-10 22:11:32
143.199.96.0/24	7,987	2026-09-10 22:11:48
8.18.63.0/24	7,764	2026-09-10 22:11:42
189.125.51.0/24	7,535	2026-09-10 22:11:43
8.44.205.0/24	7,508	2026-09-10 22:11:42
8.20.69.0/24	7,379	2026-09-10 22:11:32
216.163.247.0/24	7,375	2026-09-10 22:11:37
216.163.246.0/24	7,310	2026-09-10 22:11:37
209.164.193.0/24	7,288	2026-09-10 22:11:37
209.164.207.0/24	7,282	2026-09-10 22:11:37
216.163.241.0/24	7,263	2026-09-10 22:11:37
8.25.26.0/24	7,249	2026-09-10 22:11:37
216.163.244.0/24	7,246	2026-09-10 22:11:37
209.164.205.0/24	7,245	2026-09-10 22:11:37
209.164.204.0/24	7,241	2026-09-10 22:11:37
216.163.240.0/24	7,238	2026-09-10 22:11:37
216.163.243.0/24	7,235	2026-09-10 22:11:37
209.164.195.0/24	7,234	2026-09-10 22:11:37
216.163.242.0/24	7,233	2026-09-10 22:11:37
209.164.194.0/24	7,231	2026-09-10 22:11:37
216.163.245.0/24	7,216	2026-09-10 22:11:37
209.164.192.0/24	7,204	2026-09-10 22:11:37
143.199.145.0/24	7,114	2026-09-10 22:11:32
8.15.229.0/24	7,065	2026-09-10 22:11:48
216.33.160.0/24	7,010	2026-09-10 22:11:48
8.7.155.0/24	6,880	2026-09-10 22:11:37
216.163.252.0/24	6,879	2026-09-10 22:11:37
216.163.253.0/24	6,831	2026-09-10 22:11:37
209.164.223.0/24	6,825	2026-09-10 22:11:37
216.163.251.0/24	6,796	2026-09-10 22:11:37
209.164.209.0/24	6,785	2026-09-10 22:11:37
209.164.211.0/24	6,783	2026-09-10 22:11:37
209.164.208.0/24	6,782	2026-09-10 22:11:37
216.163.255.0/24	6,780	2026-09-10 22:11:37
216.163.250.0/24	6,778	2026-09-10 22:11:37
209.164.220.0/24	6,776	2026-09-10 22:11:37
216.163.249.0/24	6,775	2026-09-10 22:11:37
209.164.221.0/24	6,769	2026-09-10 22:11:37
216.163.248.0/24	6,763	2026-09-10 22:11:37
216.163.254.0/24	6,757	2026-09-10 22:11:37

Showing top 50 of 280 announced prefixes by sample volume.

Frequently Asked Questions

What is AS203?

AS203 is an Autonomous System Number assigned to Level 3 Parent, 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 AS203 announce?

AS203 announces 307.7K IPv4 addresses distributed across 104 routed CIDR prefixes. The network is registered in United States.

Who operates AS203?

AS203 is operated by Level 3 Parent, LLC. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.

What country is AS203 registered in?

AS203 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.

Last updated: 2026-09-10 22:39:05 UTC