T-Mobile IP Lookup

T-Mobile operates the following Autonomous System Numbers (ASNs): AS21928, AS13795, AS6167. T-Mobile US operates AS21928, one of the largest mobile-only ASNs in ARIN's registry; its dynamic IPv4 CGNAT pool means T-Mobile IPs often geolocate to a regional hub rather than the user's city. Use our IP lookup tool to identify which specific ASN a T-Mobile IP belongs to.

T-Mobile holds multiple IP address blocks allocated by its regional internet registry. These blocks are announced via BGP under AS21928 and AS13795 and AS6167. You can identify T-Mobile IP addresses using our IP lookup tool — enter any IP and check if the ISP/ASN fields show T-Mobile.

Enter the IP address in our IP Lookup tool. The ISP and ASN fields will show whether the IP is registered to T-Mobile (look for AS21928 or AS13795 or AS6167). You can also use our WHOIS Lookup to query the IP's network registration directly from the RIR database.

T-Mobile provides internet services in: United States. IP geolocation for T-Mobile addresses shows the registered location of the IP block, which may differ from the user's actual city.

T-Mobile is a mobile / cellular isp — its customer IPs are generally classified as residential or mobile, not VPN/proxy. However, customers may run VPN servers on T-Mobile IP addresses, which can cause individual IPs to be flagged.