United States · Mobile
AS21928
T-Mobile USA, Inc.
Mobile ARIN T-MOBILE-AS21928
US mobile, including the absorbed Sprint footprint. Heavily NATed and unusually trusted by consumer-facing sites, since blocking it blocks a large share of real mobile users.
Mobile — Cellular carrier. Heavy CGNAT, so one address fronts many subscribers.
- Announced prefixes
- 4
- 4 IPv4 · 0 IPv6
- IPv4 addresses
- 2.2M
- across the blocks listed below
- Largest block
- /11
- smallest prefix length announced
- Registry
- ARIN
- T-MOBILE-AS21928
01 Ranges
Announced ranges
The blocks AS21928 advertises to the rest of the internet in this snapshot. A production routing table carries more — large carriers de-aggregate for traffic engineering — so treat the totals as a floor.
Matched in your browser against the 4 blocks below. Nothing is sent anywhere.
IPv4 — 4 blocks
| Prefix | First address | Last address | Addresses |
|---|---|---|---|
| 66.94.0.0/19 | 66.94.0.0 | 66.94.31.255 | 8,192 |
| 172.32.0.0/11 | 172.32.0.0 | 172.63.255.255 | 2,097,152 |
| 208.54.0.0/16 | 208.54.0.0 | 208.54.255.255 | 65,536 |
| 216.155.128.0/17 | 216.155.128.0 | 216.155.255.255 | 32,768 |
No IPv6 announcement recorded for AS21928 in this snapshot. That is common for networks whose v6 deployment sits behind a separate AS number.