AS21928 T-Mobile USA, Inc.

United States AS-21928 ARIN 283 IPv4 prefixes 257 IPv6 prefixes

IPv4 addresses

13,130,240

IPv6 /48 networks

1,048,609

RPKI

540 valid0 no ROA

Peers and downstreams

Holder

AS name: AS-21928
Description: 21928
Organisation: T-Mobile USA, Inc.
Abuse contact: Not published
Assigned: 2002-06-11
Registered: 2002-06-12
Record last changed: 2012-02-24 14:44 UTC

100.128.0.0/9 104.152.20.0/24 162.160.0.0/11 162.173.104.0/21 162.173.20.0/24 162.173.24.0/21 162.173.32.0/21 162.173.40.0/21 162.173.48.0/21 162.173.56.0/21 162.184.0.0/15 162.186.0.0/17 162.186.128.0/17 162.187.0.0/17 162.187.128.0/17 162.190.0.0/16 162.191.0.0/16 167.20.0.0/16 168.73.0.0/17 168.73.128.0/17 170.206.0.0/17 170.206.128.0/17 172.32.0.0/11 172.56.0.0/16 172.56.0.0/23 172.56.10.0/23 172.56.100.0/23 172.56.102.0/23 172.56.104.0/21 172.56.104.0/23 172.56.106.0/23 172.56.108.0/23 172.56.110.0/23 172.56.112.0/21 172.56.112.0/23 172.56.114.0/23 172.56.116.0/23 172.56.118.0/23 172.56.12.0/23 172.56.120.0/21 172.56.120.0/23 172.56.122.0/23 172.56.124.0/23 172.56.126.0/23 172.56.128.0/23 172.56.130.0/23 172.56.134.0/23 172.56.136.0/23 172.56.138.0/24 172.56.14.0/23 172.56.140.0/23 172.56.144.0/23 172.56.148.0/23 172.56.150.0/23 172.56.152.0/21 172.56.152.0/23 172.56.154.0/23 172.56.156.0/23 172.56.16.0/23 172.56.160.0/21 172.56.160.0/23 172.56.162.0/23 172.56.164.0/23 172.56.166.0/23 172.56.168.0/21 172.56.168.0/23 172.56.170.0/23 172.56.172.0/23 172.56.174.0/23 172.56.176.0/21 172.56.176.0/23 172.56.178.0/23 172.56.18.0/23 172.56.180.0/23 172.56.182.0/23 172.56.186.0/23 172.56.188.0/23 172.56.190.0/23 172.56.192.0/21 172.56.192.0/23 172.56.194.0/23 172.56.196.0/23 172.56.198.0/23 172.56.2.0/23 172.56.20.0/23 172.56.200.0/21 172.56.200.0/23 172.56.202.0/23 172.56.204.0/23 172.56.208.0/21 172.56.208.0/23 172.56.210.0/23 172.56.212.0/23 172.56.216.0/21 172.56.216.0/23 172.56.218.0/23 172.56.22.0/23 172.56.220.0/23 172.56.222.0/23 172.56.224.0/21 172.56.224.0/23 172.56.226.0/23 172.56.228.0/23 172.56.232.0/21 172.56.232.0/23 172.56.234.0/23 172.56.236.0/23 172.56.238.0/23 172.56.24.0/23 172.56.240.0/21 172.56.240.0/23 172.56.242.0/23 172.56.244.0/23 172.56.248.0/21 172.56.248.0/23 172.56.250.0/23 172.56.252.0/23 172.56.26.0/23 172.56.28.0/23 172.56.30.0/23 172.56.32.0/23 172.56.34.0/23 172.56.36.0/23 172.56.38.0/23 172.56.4.0/23 172.56.40.0/23 172.56.42.0/23 172.56.44.0/23 172.56.46.0/23 172.56.52.0/23 172.56.54.0/23 172.56.56.0/23 172.56.58.0/23 172.56.6.0/23 172.56.60.0/23 172.56.62.0/23 172.56.64.0/21 172.56.64.0/23 172.56.66.0/23 172.56.68.0/23 172.56.72.0/21 172.56.72.0/23 172.56.74.0/23 172.56.76.0/23 172.56.78.0/23 172.56.8.0/23 172.56.80.0/21 172.56.80.0/23 172.56.82.0/23 172.56.84.0/23 172.56.86.0/23 172.56.88.0/21 172.56.88.0/23 172.56.90.0/23 172.56.92.0/23 172.56.94.0/23 172.56.96.0/21 172.56.96.0/23 172.56.98.0/23 172.58.0.0/15 172.58.0.0/21 172.58.112.0/21 172.58.120.0/21 172.58.128.0/21 172.58.144.0/21 172.58.160.0/21 172.58.176.0/21 172.58.208.0/21 172.58.240.0/21 172.58.248.0/21 172.58.48.0/21 172.58.56.0/21 172.58.8.0/21 172.59.0.0/21 172.59.104.0/21 172.59.112.0/21 172.59.120.0/21 172.59.128.0/21 172.59.136.0/21 172.59.144.0/21 172.59.152.0/21 172.59.16.0/21 172.59.160.0/21 172.59.168.0/21 172.59.176.0/21 172.59.184.0/21 172.59.192.0/21 172.59.200.0/21 172.59.208.0/21 172.59.216.0/21 172.59.224.0/21 172.59.232.0/21 172.59.24.0/21 172.59.240.0/21 172.59.32.0/21 172.59.40.0/21 172.59.48.0/21 172.59.56.0/21 172.59.64.0/21 172.59.72.0/21 172.59.8.0/21 172.59.80.0/21 172.59.88.0/21 172.59.96.0/21 174.141.208.0/20 206.29.168.0/22 206.29.188.0/23 206.29.190.0/23 208.54.0.0/17 208.54.1.0/24 208.54.100.0/22 208.54.104.0/24 208.54.110.0/23 208.54.112.0/24 208.54.117.0/24 208.54.127.0/24 208.54.128.0/19 208.54.128.0/20 208.54.134.0/23 208.54.136.0/23 208.54.138.0/23 208.54.140.0/23 208.54.142.0/24 208.54.143.0/24 208.54.144.0/20 208.54.145.0/24 208.54.153.0/24 208.54.157.0/24 208.54.158.0/24 208.54.16.0/24 208.54.18.0/24 208.54.19.0/24 208.54.2.0/24 208.54.20.0/24 208.54.32.0/24 208.54.34.0/24 208.54.35.0/24 208.54.36.0/24 208.54.37.0/24 208.54.39.0/24 208.54.4.0/24 208.54.40.0/24 208.54.44.0/24 208.54.5.0/24 208.54.57.0/24 208.54.66.0/24 208.54.67.0/24 208.54.7.0/24 208.54.70.0/24 208.54.74.0/24 208.54.75.0/24 208.54.80.0/24 208.54.83.0/24 208.54.85.0/24 208.54.86.0/24 208.54.87.0/24 208.54.90.0/24 208.54.96.0/19 208.54.97.0/24 65.76.0.0/16 66.94.0.0/19 66.94.13.0/24 66.94.14.0/24 66.94.15.0/24 66.94.17.0/24 66.94.18.0/23 66.94.24.0/24 66.94.26.0/24 66.94.29.0/24 66.94.3.0/24 66.94.30.0/24 66.94.4.0/24 66.94.5.0/24 66.94.6.0/24 66.94.7.0/24 66.94.8.0/24 72.250.0.0/17 74.60.0.0/16 75.122.0.0/17 75.122.128.0/17 75.123.0.0/17 75.123.128.0/17 97.65.105.0/24

Routing changes

Last 30 days

2026-10-04 04:10 UTC	Neighbour gone	AS264409	upstream
2026-10-04 04:10 UTC	Neighbour gone	AS33891	upstream
2026-10-04 04:10 UTC	Relationship changed	AS9002	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS7575	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS7195	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS6424	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS64126	upstream to peer
2026-10-04 04:10 UTC	New neighbour	AS61568	peer
2026-10-04 04:10 UTC	Relationship changed	AS6057	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS60068	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS58453	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS52025	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS4637	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS4230	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS394256	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS39120	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS37468	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS35280	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS32621	upstream to peer
2026-10-04 04:10 UTC	New neighbour	AS20326	peer
2026-10-04 04:10 UTC	Relationship changed	AS137409	upstream to peer
2026-10-04 04:10 UTC	Relationship changed	AS1031	upstream to peer
2026-10-04 04:10 UTC	Prefix gone	172.58.136.0/21
2026-10-04 04:10 UTC	Prefix gone	172.58.104.0/21
2026-10-04 04:10 UTC	Prefix gone	172.56.70.0/23
2026-10-04 04:10 UTC	New prefix	208.54.158.0/24
2026-10-04 04:10 UTC	New prefix	208.54.57.0/24
2026-10-04 04:10 UTC	New prefix	208.54.157.0/24
2026-10-04 04:10 UTC	New prefix	2607:f880:ff20::/44
2026-10-04 04:10 UTC	New prefix	162.173.56.0/21

WHOIS

aut-num:        AS21928
as-name:        T-MOBILE-AS21928
handle:         AS21928
registrant:     TMOBI (T-Mobile USA, Inc.)
last changed:   2012-02-24T09:44:34-05:00
registration:   2002-06-12T00:00:00-04:00
source:         ARIN (RDAP)

Routing data

Updated just now

Registry record

Fetched just now from ARIN RDAP

Prefixes and neighbours come from the RIPE RIS route collectors. Data older than 5 minutes is refreshed when this page is opened.

API

curl -H "X-API-Key: YOUR_KEY" https://ip-fd.net/api/v1/asn/21928

const res = await fetch('https://ip-fd.net/api/v1/asn/21928', {
  headers: { 'X-API-Key': 'YOUR_KEY' }
});
const data = await res.json();
console.log(data);

import requests

r = requests.get('https://ip-fd.net/api/v1/asn/21928', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/21928');
curl_setopt($ch, CURLOPT_HTTPHEADER, ['X-API-Key: YOUR_KEY']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = json_decode(curl_exec($ch), true);
print_r($data);

req, _ := http.NewRequest("GET", "https://ip-fd.net/api/v1/asn/21928", nil)
req.Header.Set("X-API-Key", "YOUR_KEY")
res, err := http.DefaultClient.Do(req)
if err != nil {
    log.Fatal(err)
}
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

Works without a key at a lower rate. Get a free key.

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