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AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc.

Everything the routing table and the registries say about AS21928: who holds it, which registry issued it, and which address blocks it advertises.

Mobile carriersAS21928

283 IPv4 and 257 IPv6 prefixes announced.

Registry facts

Refreshed daily
AS number
AS21928
Holder
T-MOBILE-AS21928 - T-Mobile USA, Inc.
Country
US
Regional registry
ARIN — American Registry for Internet Numbers
Registry block
21504-23455 (IANA 16-bit Autonomous System (AS) Numbers Registry)
Announced today
Yes
IPv4 prefixes
283
IPv6 prefixes
257
Observed at
2026-09-05T16:00:00

Data: RIPEstat. Prefix and holder data comes from the RIPEstat Data API and is cached for 24 hours. The regional registry is derived from the IANA AS number allocation table. Authoritative registry records are served by ARIN RDAP.

Announced prefixes

283 IPv4 · 257 IPv6
  • 100 IPv4 shown
  • 100 IPv6 shown
  • 65.76.0.0/16
  • 66.94.0.0/19
  • 66.94.3.0/24
  • 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
  • 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
  • 66.94.30.0/24
  • 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
  • 100.128.0.0/9
  • 104.152.20.0/24
  • 162.160.0.0/11
  • 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
  • 162.173.104.0/21
  • 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
  • 172.56.2.0/23
  • 172.56.4.0/23
  • 172.56.6.0/23
  • 172.56.8.0/23
  • 172.56.10.0/23
  • 172.56.12.0/23
  • 172.56.14.0/23
  • 172.56.16.0/23
  • 172.56.18.0/23
  • 172.56.20.0/23
  • 172.56.22.0/23
  • 172.56.24.0/23
  • 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
  • 172.56.40.0/23
  • 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
  • 172.56.60.0/23
  • 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
  • 172.56.70.0/23
  • 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
  • 172.56.80.0/21
  • 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
  • 2001:4870:150::/44
  • 2001:4870:e00b::/48
  • 2607:fb90::/28
  • 2607:fb90::/32
  • 2607:fb90::/40
  • 2607:fb90:1200::/40
  • 2607:fb90:1300::/40
  • 2607:fb90:1700::/40
  • 2607:fb90:1800::/40
  • 2607:fb90:1c00::/40
  • 2607:fb90:200::/40
  • 2607:fb90:2000::/40
  • 2607:fb90:2100::/40
  • 2607:fb90:2200::/40
  • 2607:fb90:2300::/40
  • 2607:fb90:2400::/40
  • 2607:fb90:2500::/40
  • 2607:fb90:2700::/40
  • 2607:fb90:2c00::/40
  • 2607:fb90:2d00::/40
  • 2607:fb90:300::/40
  • 2607:fb90:3300::/40
  • 2607:fb90:3500::/40
  • 2607:fb90:3700::/40
  • 2607:fb90:3900::/40
  • 2607:fb90:3c00::/40
  • 2607:fb90:3d00::/40
  • 2607:fb90:3e00::/40
  • 2607:fb90:3f00::/40
  • 2607:fb90:400::/40
  • 2607:fb90:4000::/40
  • 2607:fb90:4200::/40
  • 2607:fb90:4500::/40
  • 2607:fb90:4800::/40
  • 2607:fb90:4a00::/40
  • 2607:fb90:4f00::/40
  • 2607:fb90:500::/40
  • 2607:fb90:5000::/40
  • 2607:fb90:5200::/40
  • 2607:fb90:5300::/40
  • 2607:fb90:5500::/40
  • 2607:fb90:5700::/40
  • 2607:fb90:5800::/40
  • 2607:fb90:5c00::/40
  • 2607:fb90:5e00::/40
  • 2607:fb90:5f00::/40
  • 2607:fb90:600::/40
  • 2607:fb90:6000::/40
  • 2607:fb90:6100::/40
  • 2607:fb90:6200::/40
  • 2607:fb90:6300::/40
  • 2607:fb90:6400::/40
  • 2607:fb90:6800::/40
  • 2607:fb90:6c00::/38
  • 2607:fb90:6d00::/40
  • 2607:fb90:700::/40
  • 2607:fb90:7100::/40
  • 2607:fb90:7300::/40
  • 2607:fb90:7400::/40
  • 2607:fb90:7500::/40
  • 2607:fb90:7700::/40
  • 2607:fb90:7800::/40
  • 2607:fb90:7900::/40
  • 2607:fb90:7a00::/40
  • 2607:fb90:7e00::/40
  • 2607:fb90:7f00::/40
  • 2607:fb90:800::/40
  • 2607:fb90:8000::/38
  • 2607:fb90:8000::/40
  • 2607:fb90:8100::/40
  • 2607:fb90:8700::/40
  • 2607:fb90:8a00::/40
  • 2607:fb90:8b00::/40
  • 2607:fb90:8d00::/40
  • 2607:fb90:8e00::/40
  • 2607:fb90:8f00::/40
  • 2607:fb90:9000::/40
  • 2607:fb90:9100::/40
  • 2607:fb90:9200::/40
  • 2607:fb90:9300::/40
  • 2607:fb90:9500::/40
  • 2607:fb90:9900::/40
  • 2607:fb90:9a00::/40
  • 2607:fb90:9b00::/40
  • 2607:fb90:9c00::/40
  • 2607:fb90:9d00::/40
  • 2607:fb90:9e00::/40
  • 2607:fb90:9f00::/40
  • 2607:fb90:a000::/40
  • 2607:fb90:a100::/40
  • 2607:fb90:a200::/40
  • 2607:fb90:a500::/40
  • 2607:fb90:a600::/40
  • 2607:fb90:a800::/40
  • 2607:fb90:ac00::/40
  • 2607:fb90:ad00::/40
  • 2607:fb90:af00::/40
  • 2607:fb90:b00::/40
  • 2607:fb90:b100::/40
  • 2607:fb90:b200::/40

A prefix here is a block this AS was seen originating in BGP, not a block it is guaranteed to own. Announcement and allocation are different facts, and they disagree more often than people expect.

Registry record

arin
FieldValue
ASNumber21928
ASNameT-MOBILE-AS21928
ASHandle21928
RegDate2002-06-12
Refhttps://rdap.arin.net/registry/autnum/21928
sourceARIN
OrgAbuseHandleABUSE4857-ARIN
OrgAbuseNameabuse
OrgAbusePhone+1-888-662-4662
OrgAbuseEmailabuse@t-mobile.com
OrgAbuseRefhttps://rdap.arin.net/registry/entity/ABUSE4857-ARIN
sourceARIN
OrgNameT-Mobile USA, Inc.
OrgIdTMOBI
Address12920 SE 38th Street
CityBellevue
StateProvWA
PostalCode98006
CountryUS
RegDate2003-01-02
Refhttps://rdap.arin.net/registry/entity/TMOBI
sourceARIN
OrgTechHandleDNSAD11-ARIN
OrgTechNameDNS Administrators

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