Autonomous System

AS21928

T-Mobile USA, Inc.

Mobile ISP
Organization
T-Mobile USA, Inc.
ASN
AS21928
Country
United States
Category
Mobile ISP
IP Geolocation Lookup WHOIS Lookup VPN Leak Test

What is AS21928?

AS21928 is the primary Autonomous System for T-Mobile USA, Inc., one of the three largest US mobile carriers. T-Mobile provides nationwide LTE and 5G mobile data, and T-Mobile Home Internet (fixed wireless broadband using the mobile network). T-Mobile completed its merger with Sprint in 2020 and operates additional legacy Sprint ASNs alongside AS21928.

Privacy note

If AS21928 appears in your IP lookup while a VPN is active, the VPN is not routing your connection through its server. T-Mobile mobile and Home Internet customers see AS21928 without a VPN. Mobile connections may cycle through different T-Mobile ASNs between cell towers. A working VPN should show your VPN provider's ASN instead.

Check IPs in AS21928 with MyIPScan tools

IP Geolocation LookupSee country, city, ISP, and ASN details for any IP address. WHOIS LookupGet registrar and ownership information for this IP block. VPN Leak TestVerify your VPN is routing all traffic correctly. DNS Leak TestCheck which DNS resolvers your browser is using. Fix a VPN LeakStep-by-step guide if your ISP still appears in tests. Fix a DNS LeakStop DNS queries going to your ISP's resolvers.

Frequently asked questions about AS21928

What is AS21928?

AS21928 is the primary Autonomous System for T-Mobile USA, Inc., one of the three largest US mobile carriers. T-Mobile uses this ASN for its mobile data network and T-Mobile Home Internet fixed wireless service.

Who owns AS21928?

AS21928 is registered to T-Mobile USA, Inc., a subsidiary of Deutsche Telekom AG, headquartered in Bellevue, Washington. Deutsche Telekom's German network operates separately under AS3320.

Why does AS21928 appear in my VPN test?

T-Mobile mobile and Home Internet customers see AS21928 without a VPN. If AS21928 appears while a VPN is connected, the VPN is leaking your real IP. Mobile connections can cycle between T-Mobile ASNs between cell towers. Test with myipscan.net/tools/vpn-leak-test.

Does T-Mobile collect data on mobile internet usage?

T-Mobile collects network usage data subject to its privacy policy and US law enforcement requests. Using a VPN prevents T-Mobile from seeing the content of your traffic and DNS queries, though T-Mobile can still observe that you are connecting to a VPN server.

How do I investigate IPs in AS21928?

Use IP Geolocation Lookup, WHOIS Lookup, or VPN Leak Test. You can also look up AS21928 in public BGP databases such as bgp.he.net.

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