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.
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.