Autonomous System

AS21928

T-Mobile USA, Inc.

T-Mobile USA, Inc. United States 🌐 t-mobile.com

Announced IPs

13,121,024

CIDR prefixes

ASN

AS21928

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.

67/100

Moderate

How this score is built

Baseline (neutral) 65
Mobile allocation +2
Trust score 67 / 100

Experimental · trust-vectors model v1.2.1 — a transparent heuristic, not a definitive verdict. How it works →

About T-Mobile US

T-Mobile US, Inc. is an American wireless network operator headquartered in Bellevue, Washington.

Founded

2001

Headquarters

Bellevue

Industry

telecommunications industry

Parent

Deutsche Telekom

Employees

38,000

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

Network profile

Source: PeeringDB →

Network type Cable/DSL/ISP

Geographic scope North America

Traffic ratio Mostly Inbound

Peering policy Selective

IRR record AS-21928

Present at 10 internet exchanges: SIX Seattle: MTU 1500, SFMIX, FL-IX, Any2West, NYIIX New York, Any2Denver, MICE: Shared Peering, Boston Internet Exchange, DET-iX, PR-IX: Main

Website ↗

Web3 footprint

AS21928 hosts 1 observed decentralized-network node across 1 network. It’s a neutral signal — it does not affect the reputation score. See the full web3 node map.

IPFS IPFS 1

AS21928 — global IP footprint

Cities where AS21928 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.

View on 3D globe →

Top CIDR ranges

CIDR	IPs	PTR Density	Organization	Country	State	City
100.128.0.0/9	8.39M	0.0%	T-Mobile USA, Inc.	US	Washington	Seattle
100.160.0.0/11	2.10M	0.0%	T-Mobile USA, Inc.	US	—	—
100.224.0.0/11	2.10M	0.0%	T-Mobile USA, Inc.	US	Washington	Seattle
162.160.0.0/11	2.10M	0.0%	T-Mobile USA, Inc.	US	Illinois	Chicago
172.32.0.0/11	2.10M	0.9%	T-Mobile USA, Inc.	US	New Jersey	East Orange
100.208.0.0/12	1.05M	0.0%	T-Mobile USA, Inc.	US	—	—
162.176.0.0/12	1.05M	0.0%	T-Mobile USA, Inc.	US	Illinois	Chicago
172.32.0.0/12	1.05M	0.0%	T-Mobile USA, Inc.	US	—	—
100.152.0.0/13	524.3K	0.0%	T-Mobile USA, Inc.	US	—	—
100.200.0.0/13	524.3K	0.0%	T-Mobile USA, Inc.	US	—	—
162.160.0.0/13	524.3K	0.0%	T-Mobile USA, Inc.	US	Indiana	Fort Wayne
172.48.0.0/13	524.3K	0.0%	T-Mobile USA, Inc.	US	—	—
100.132.0.0/14	262.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.136.0.0/14	262.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.144.0.0/14	262.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.192.0.0/14	262.1K	0.0%	T-Mobile USA, Inc.	US	—	—
162.168.0.0/14	262.1K	0.0%	T-Mobile USA, Inc.	US	Arizona	Prescott
172.60.0.0/14	262.1K	0.0%	T-Mobile USA, Inc.	US	—	—
75.122.0.0/15	131.1K	0.0%	T-Mobile USA, Inc.	US	California	Los Angeles
100.130.0.0/15	131.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.142.0.0/15	131.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.148.0.0/15	131.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.196.0.0/15	131.1K	0.0%	T-Mobile USA, Inc.	US	—	—
162.174.0.0/15	131.1K	0.0%	T-Mobile USA, Inc.	US	—	—
65.76.0.0/16	65.5K	0.0%	T-Mobile USA, Inc.	US	California	Yorba Linda
74.60.0.0/16	65.5K	0.0%	T-Mobile USA, Inc.	US	—	—
100.129.0.0/16	65.5K	0.0%	T-Mobile USA, Inc.	US	—	—
100.151.0.0/16	65.5K	0.0%	T-Mobile USA, Inc.	US	—	—
100.198.0.0/16	65.5K	0.0%	T-Mobile USA, Inc.	US	—	—
162.172.0.0/16	65.5K	0.0%	T-Mobile USA, Inc.	US	Pennsylvania	Pittsburgh
167.20.0.0/16	65.5K	0.0%	T-Mobile USA, Inc.	US	New York	Brooklyn
168.73.0.0/16	65.5K	0.0%	T-Mobile USA, Inc.	US	Illinois	Chicago
170.206.0.0/16	65.5K	0.0%	T-Mobile USA, Inc.	US	North Carolina	Charlotte
172.57.0.0/16	65.5K	0.0%	T-Mobile USA, Inc.	US	Pennsylvania	Sharon
172.58.0.0/16	65.5K	20.1%	T-Mobile USA, Inc.	US	Washington	Renton
100.140.128.0/17	32.8K	0.0%	T-Mobile USA, Inc.	US	—	—
100.141.0.0/17	32.8K	0.0%	T-Mobile USA, Inc.	US	—	—
100.150.0.0/17	32.8K	0.0%	T-Mobile USA, Inc.	US	—	—
100.199.128.0/17	32.8K	0.0%	T-Mobile USA, Inc.	US	—	—
162.173.0.0/17	32.8K	0.0%	T-Mobile USA, Inc.	US	—	—
172.56.0.0/17	32.8K	11.0%	T-Mobile USA, Inc.	US	Florida	Orlando
172.59.128.0/17	32.8K	0.0%	T-Mobile USA, Inc.	US	California	San Jose
72.250.0.0/18	16.4K	0.0%	T-Mobile USA, Inc.	US	Missouri	Kansas City
100.140.64.0/18	16.4K	0.0%	T-Mobile USA, Inc.	US	—	—
100.141.128.0/18	16.4K	0.0%	T-Mobile USA, Inc.	US	—	—
100.150.128.0/18	16.4K	0.0%	T-Mobile USA, Inc.	US	—	—
100.199.64.0/18	16.4K	0.0%	T-Mobile USA, Inc.	US	—	—
162.173.128.0/18	16.4K	0.0%	T-Mobile USA, Inc.	US	—	—
172.56.192.0/18	16.4K	4.3%	T-Mobile USA, Inc.	US	Nevada	Las Vegas
172.59.64.0/18	16.4K	0.0%	T-Mobile USA, Inc.	US	Florida	Jacksonville
208.54.64.0/18	16.4K	1.4%	T-Mobile USA, Inc.	US	Alabama	Birmingham
66.94.0.0/19	8.2K	0.9%	T-Mobile USA, Inc.	US	Washington	Seattle
100.128.32.0/19	8.2K	0.0%	T-Mobile USA, Inc.	US	—	—
100.128.96.0/19	8.2K	0.0%	T-Mobile USA, Inc.	US	—	—
100.140.32.0/19	8.2K	0.0%	T-Mobile USA, Inc.	US	—	—
100.141.192.0/19	8.2K	0.0%	T-Mobile USA, Inc.	US	—	—
100.150.192.0/19	8.2K	0.0%	T-Mobile USA, Inc.	US	—	—
100.199.32.0/19	8.2K	0.0%	T-Mobile USA, Inc.	US	—	—
162.173.192.0/19	8.2K	0.0%	T-Mobile USA, Inc.	US	—	—
172.56.128.0/19	8.2K	5.3%	T-Mobile USA, Inc.	US	Oregon	Portland
172.59.32.0/19	8.2K	0.0%	T-Mobile USA, Inc.	US	Ohio	Cincinnati
208.54.96.0/19	8.2K	1.1%	T-Mobile USA, Inc.	US	New York	Rochester
208.54.128.0/19	8.2K	3.2%	T-Mobile USA, Inc.	US	Washington	Redmond
72.250.64.0/20	4.1K	0.0%	T-Mobile USA, Inc.	US	Missouri	Kansas City
72.250.96.0/20	4.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.128.16.0/20	4.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.128.80.0/20	4.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.128.128.0/20	4.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.128.176.0/20	4.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.140.16.0/20	4.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.141.224.0/20	4.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.150.224.0/20	4.1K	0.0%	T-Mobile USA, Inc.	US	—	—
100.199.16.0/20	4.1K	0.0%	T-Mobile USA, Inc.	US	—	—
162.173.240.0/20	4.1K	0.0%	T-Mobile USA, Inc.	US	—	—
172.56.176.0/20	4.1K	4.7%	T-Mobile USA, Inc.	US	California	Riverside
172.59.0.0/20	4.1K	0.0%	T-Mobile USA, Inc.	US	New Mexico	Albuquerque
174.141.208.0/20	4.1K	1.8%	T-Mobile USA, Inc.	US	Kansas	Overland Park
208.54.0.0/20	4.1K	0.9%	T-Mobile USA, Inc.	US	California	Sacramento
208.54.48.0/20	4.1K	0.5%	T-Mobile USA, Inc.	US	Texas	Dallas
208.54.64.0/20	4.1K	0.3%	T-Mobile USA, Inc.	US	Alabama	Birmingham
100.128.8.0/21	2.0K	0.0%	T-Mobile USA, Inc.	US	—	—
100.128.72.0/21	2.0K	0.0%	T-Mobile USA, Inc.	US	—	—
100.128.192.0/21	2.0K	0.0%	T-Mobile USA, Inc.	US	—	—
100.140.8.0/21	2.0K	0.0%	T-Mobile USA, Inc.	US	—	—
100.141.240.0/21	2.0K	0.0%	T-Mobile USA, Inc.	US	—	—
100.150.240.0/21	2.0K	0.0%	T-Mobile USA, Inc.	US	—	—
100.199.8.0/21	2.0K	0.0%	T-Mobile USA, Inc.	US	—	—
162.173.224.0/21	2.0K	0.0%	T-Mobile USA, Inc.	US	—	—
162.173.232.0/21	2.0K	0.0%	T-Mobile USA, Inc.	CA	—	—
172.56.168.0/21	2.0K	4.7%	T-Mobile USA, Inc.	US	California	Sacramento
172.59.16.0/21	2.0K	0.0%	T-Mobile USA, Inc.	PR	—	—
172.59.24.0/21	2.0K	0.0%	T-Mobile USA, Inc.	US	Ohio	Cleveland
208.54.24.0/21	2.0K	1.0%	T-Mobile USA, Inc.	US	Washington	Seattle
208.54.40.0/21	2.0K	0.3%	T-Mobile USA, Inc.	US	District of Columbia	Washington
208.54.88.0/21	2.0K	0.6%	T-Mobile USA, Inc.	US	Pennsylvania	Philadelphia
100.128.68.0/22	1.0K	0.0%	T-Mobile USA, Inc.	US	—	—
100.128.144.0/22	1.0K	0.0%	T-Mobile USA, Inc.	US	—	—
100.128.160.0/22	1.0K	0.0%	T-Mobile USA, Inc.	US	—	—
100.128.172.0/22	1.0K	0.0%	T-Mobile USA, Inc.	US	—	—
100.128.216.0/22	1.0K	0.0%	T-Mobile USA, Inc.	US	—	—

BGP Announced Prefixes

Live BGP anomalies →

Prefixes AS21928 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
172.56.34.0/23	61,104	2026-10-15 07:11:55
172.56.2.0/23	60,593	2026-10-15 07:13:47
172.56.4.0/23	58,660	2026-10-15 07:11:55
172.56.6.0/23	56,408	2026-10-15 07:11:55
172.56.28.0/23	54,927	2026-10-15 07:11:41
172.56.36.0/23	53,804	2026-10-15 07:11:55
172.56.72.0/23	47,791	2026-10-15 07:11:55
172.56.76.0/23	47,330	2026-10-15 07:11:55
172.56.74.0/23	47,255	2026-10-15 07:11:55
172.56.78.0/23	47,107	2026-10-15 07:11:55
172.56.26.0/23	46,673	2026-10-15 07:11:55
208.54.34.0/24	40,852	2026-10-15 06:58:39
172.56.216.0/21	39,510	2026-10-15 07:11:55
172.59.120.0/21	39,447	2026-10-15 07:10:49
75.123.0.0/17	37,963	2026-10-15 07:14:01
170.206.128.0/17	36,842	2026-10-15 07:11:53
172.56.208.0/21	35,476	2026-10-15 07:11:41
172.56.186.0/23	34,084	2026-10-15 07:11:55
172.56.54.0/23	34,074	2026-10-15 07:11:55
172.58.240.0/21	34,002	2026-10-15 07:13:47
172.56.0.0/23	32,905	2026-10-15 07:10:49
172.56.80.0/21	32,849	2026-10-15 07:11:41
172.56.18.0/23	32,783	2026-10-15 07:10:49
172.59.40.0/21	32,777	2026-10-15 07:11:41
172.56.240.0/21	31,929	2026-10-15 07:11:55
172.56.52.0/23	29,058	2026-10-15 07:11:41
172.56.16.0/23	28,592	2026-10-15 07:10:49
208.54.145.0/24	27,450	2026-10-15 06:58:39
172.56.120.0/21	27,238	2026-10-15 07:11:55
172.56.176.0/21	26,542	2026-10-15 07:11:55
172.58.208.0/21	26,487	2026-10-15 07:11:55
172.56.232.0/21	26,401	2026-10-15 07:11:55
172.59.32.0/21	25,640	2026-10-15 07:10:49
66.94.17.0/24	25,250	2026-10-15 07:13:54
172.56.8.0/23	24,503	2026-10-15 07:11:55
75.123.128.0/17	24,324	2026-10-15 07:14:01
172.58.112.0/21	24,183	2026-10-15 07:11:41
172.59.64.0/21	24,090	2026-10-15 07:11:55
172.56.96.0/21	24,088	2026-10-15 07:11:55
75.122.128.0/17	23,989	2026-10-15 07:14:01
208.54.142.0/24	23,949	2026-10-15 06:58:39
172.56.32.0/23	23,799	2026-10-15 07:11:51
172.59.128.0/21	23,568	2026-10-15 07:11:41
172.56.20.0/23	23,545	2026-10-15 07:11:55
172.56.22.0/23	23,424	2026-10-15 07:11:55
208.54.138.0/23	23,058	2026-10-15 06:58:39
208.54.144.0/20	22,804	2026-10-15 06:58:39
172.59.104.0/21	22,766	2026-10-15 07:10:49
172.59.152.0/21	22,467	2026-10-15 07:11:20
172.59.0.0/21	22,392	2026-10-15 07:11:55

Showing top 50 of 293 announced prefixes by sample volume.

Frequently Asked Questions

What is AS21928?

AS21928 is an Autonomous System Number assigned to T-Mobile USA, Inc.. 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 AS21928 announce?

AS21928 announces 13.12M IPv4 addresses distributed across 34 routed CIDR prefixes. The network is registered in United States.

Who operates AS21928?

AS21928 is operated by T-Mobile USA, Inc.. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.

What country is AS21928 registered in?

AS21928 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: 2026-10-15 07:24:05 UTC