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
- Active-threat / abuse risk −12
- Mobile allocation +2
- Trust score 55 / 100
Experimental · trust-vectors model v1.3.0 — 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.
⚠ 1 MOAS prefix — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS21928 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) |
|---|---|---|
| 208.54.1.0/24 | AS21928, AS198949 | 2026-11-13 08:54:08 |
Network profile
Source: PeeringDB →Present at 9 internet exchanges: SIX Seattle: MTU 1500, FL-IX, Any2West, NYIIX New York, Any2Denver, MICE: Shared Peering, Boston Internet Exchange, DET-iX, PR-IX: Main
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.
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.
Top CIDR ranges
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 |
|---|---|---|
| 208.54.145.0/24 | 66,502 | 2026-11-13 04:21:11 |
| 172.56.34.0/23 | 64,493 | 2026-11-13 08:47:05 |
| 172.56.2.0/23 | 62,701 | 2026-11-13 08:49:53 |
| 172.56.4.0/23 | 60,900 | 2026-11-13 08:47:05 |
| 172.56.6.0/23 | 58,305 | 2026-11-13 08:49:53 |
| 208.54.153.0/24 | 56,959 | 2026-11-13 08:18:15 |
| 172.56.28.0/23 | 56,745 | 2026-11-13 08:47:05 |
| 172.56.36.0/23 | 55,889 | 2026-11-13 08:46:12 |
| 208.54.34.0/24 | 49,989 | 2026-11-13 08:17:59 |
| 172.56.72.0/23 | 48,707 | 2026-11-13 07:57:12 |
| 172.56.76.0/23 | 48,146 | 2026-11-13 07:57:12 |
| 172.56.74.0/23 | 48,066 | 2026-11-13 07:57:12 |
| 172.56.78.0/23 | 47,898 | 2026-11-13 07:57:12 |
| 172.56.26.0/23 | 47,867 | 2026-11-13 07:57:12 |
| 75.123.0.0/17 | 44,640 | 2026-11-13 08:17:58 |
| 172.56.216.0/21 | 44,320 | 2026-11-13 08:46:44 |
| 172.59.120.0/21 | 41,535 | 2026-11-13 08:47:12 |
| 208.54.157.0/24 | 40,736 | 2026-11-13 04:21:11 |
| 208.54.158.0/24 | 40,643 | 2026-11-13 04:21:11 |
| 172.56.208.0/21 | 40,570 | 2026-11-13 08:49:46 |
| 170.206.128.0/17 | 39,123 | 2026-11-13 07:26:57 |
| 172.58.240.0/21 | 36,775 | 2026-11-13 08:49:57 |
| 172.56.54.0/23 | 36,298 | 2026-11-13 08:47:05 |
| 172.56.186.0/23 | 36,285 | 2026-11-13 08:47:05 |
| 172.56.240.0/21 | 36,096 | 2026-11-13 08:46:44 |
| 208.54.35.0/24 | 35,873 | 2026-11-13 08:11:37 |
| 172.56.80.0/21 | 35,242 | 2026-11-13 08:47:15 |
| 172.59.40.0/21 | 35,204 | 2026-11-13 08:49:58 |
| 172.56.0.0/23 | 35,148 | 2026-11-13 08:47:05 |
| 172.56.18.0/23 | 35,011 | 2026-11-13 08:47:05 |
| 172.56.52.0/23 | 33,190 | 2026-11-13 08:48:45 |
| 208.54.85.0/24 | 32,211 | 2026-11-13 08:09:07 |
| 172.56.16.0/23 | 32,154 | 2026-11-13 08:46:44 |
| 172.56.120.0/21 | 30,173 | 2026-11-13 08:46:44 |
| 172.56.176.0/21 | 29,510 | 2026-11-13 08:48:47 |
| 172.56.20.0/23 | 29,447 | 2026-11-13 08:48:45 |
| 66.94.17.0/24 | 29,435 | 2026-11-13 04:20:56 |
| 172.59.32.0/21 | 29,422 | 2026-11-13 08:46:44 |
| 172.58.208.0/21 | 28,868 | 2026-11-13 08:47:18 |
| 172.56.232.0/21 | 28,783 | 2026-11-13 08:47:18 |
| 75.123.128.0/17 | 28,690 | 2026-11-13 04:20:56 |
| 172.56.8.0/23 | 28,559 | 2026-11-13 08:46:44 |
| 75.122.128.0/17 | 28,369 | 2026-11-13 04:20:56 |
| 208.54.142.0/24 | 27,726 | 2026-11-13 08:18:15 |
| 208.54.144.0/20 | 27,544 | 2026-11-13 08:18:15 |
| 172.56.22.0/23 | 27,301 | 2026-11-13 08:47:05 |
| 172.56.64.0/21 | 27,060 | 2026-11-13 08:47:11 |
| 172.58.160.0/21 | 26,679 | 2026-11-13 08:46:44 |
| 172.56.96.0/21 | 26,587 | 2026-11-13 08:47:15 |
| 172.59.64.0/21 | 26,574 | 2026-11-13 08:49:58 |
Showing top 50 of 294 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 37 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.
