ResearchRouting table, RPKI, IRR & looking glass

AS21928 T-Mobile USA, Inc.

AS21928 (T-MOBILE-AS21928) is registered to T-Mobile USA, Inc. in US, through ARIN. It originates 542 prefixes in the global routing table.

284
IPv4 prefixes
258
IPv6 prefixes
13,130,240
IPv4 addresses
100%
RPKI valid
Registration

Who holds AS21928

Names from RIPE NCC’s daily list of every allocated AS number. The ASN lookup fetches the full WHOIS record live.

AS number
AS21928
Handle
T-MOBILE-AS21928
Organization
T-Mobile USA, Inc.
Country
US
Registry
ARIN
ASPA
None published
WHOIS recordARIN
#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       21928
ASName:         T-MOBILE-AS21928
ASHandle:       AS21928
RegDate:        2002-06-12
Updated:        2012-02-24
Ref:            https://rdap.arin.net/registry/autnum/21928



OrgName:        T-Mobile USA, Inc.
OrgId:          TMOBI
Address:        12920 SE 38th Street
City:           Bellevue
StateProv:      WA
PostalCode:     98006
Country:        US
RegDate:        2003-01-02
Updated:        2017-01-28
Ref:            https://rdap.arin.net/registry/entity/TMOBI


OrgAbuseHandle: ABUSE4857-ARIN
OrgAbuseName:   abuse
OrgAbusePhone:  +1-888-662-4662 
OrgAbuseEmail:  abuse@t-mobile.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE4857-ARIN

OrgTechHandle: DNSAD11-ARIN
OrgTechName:   DNS Administrators
OrgTechPhone:  +1-888-662-4662 
OrgTechEmail:  ARINtechcontact@t-mobile.com
OrgTechRef:    https://rdap.arin.net/registry/entity/DNSAD11-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#
Routing

What AS21928 announces

Prefixes originated by AS21928 in the RouteViews table (refreshed every four hours), each checked against the RPKI (every ten minutes) and the IRR (daily).

IPv4 prefixes
284
IPv6 prefixes
258
IPv4 addresses
13,130,240 (51,290 /24s)
RPKI valid
542 100%
RPKI invalid
0
RPKI not found
0
ROAs naming AS21928
74
With an IRR route object
535 98%
Prefixes

Announced prefixes

Each opens its own page: who announces it, the paths our collectors see, its ROAs and route objects.

IPv4 (284)
65.76.0.0/1666.94.0.0/1966.94.3.0/2466.94.4.0/2466.94.5.0/2466.94.6.0/2466.94.7.0/2466.94.8.0/2466.94.13.0/2466.94.14.0/2466.94.15.0/2466.94.17.0/2466.94.18.0/2366.94.24.0/2466.94.26.0/2466.94.29.0/2466.94.30.0/2472.250.0.0/1774.60.0.0/1675.122.0.0/1775.122.128.0/1775.123.0.0/1775.123.128.0/1797.65.105.0/24100.128.0.0/9104.152.20.0/24162.160.0.0/11162.173.20.0/24162.173.24.0/21162.173.32.0/21162.173.40.0/21162.173.48.0/21162.173.56.0/21162.173.104.0/21162.184.0.0/15162.186.0.0/17162.186.128.0/17162.187.0.0/17162.187.128.0/17162.190.0.0/16162.191.0.0/16167.20.0.0/16168.73.0.0/17168.73.128.0/17170.206.0.0/17170.206.128.0/17172.32.0.0/11172.56.0.0/16172.56.0.0/23172.56.2.0/23172.56.4.0/23172.56.6.0/23172.56.8.0/23172.56.10.0/23172.56.12.0/23172.56.14.0/23172.56.16.0/23172.56.18.0/23172.56.20.0/23172.56.22.0/23172.56.24.0/23172.56.26.0/23172.56.28.0/23172.56.30.0/23172.56.32.0/23172.56.34.0/23172.56.36.0/23172.56.38.0/23172.56.40.0/23172.56.42.0/23172.56.44.0/23172.56.46.0/23172.56.52.0/23172.56.54.0/23172.56.56.0/23172.56.58.0/23172.56.60.0/23172.56.62.0/23172.56.64.0/21172.56.64.0/23172.56.66.0/23172.56.68.0/23172.56.72.0/21172.56.72.0/23172.56.74.0/23172.56.76.0/23172.56.78.0/23172.56.80.0/21172.56.80.0/23172.56.82.0/23172.56.84.0/23172.56.86.0/23172.56.88.0/21172.56.88.0/23172.56.90.0/23172.56.92.0/23172.56.94.0/23172.56.96.0/21172.56.96.0/23172.56.98.0/23172.56.100.0/23172.56.102.0/23172.56.104.0/21172.56.104.0/23172.56.106.0/23172.56.108.0/23172.56.110.0/23172.56.112.0/21172.56.112.0/23172.56.114.0/23172.56.116.0/23172.56.118.0/23172.56.120.0/21172.56.120.0/23172.56.122.0/23172.56.124.0/23172.56.126.0/23172.56.128.0/23172.56.130.0/23172.56.134.0/23
Show 164 more
172.56.136.0/23172.56.140.0/23172.56.144.0/23172.56.148.0/23172.56.150.0/23172.56.152.0/21172.56.152.0/23172.56.154.0/23172.56.156.0/23172.56.160.0/21172.56.160.0/23172.56.162.0/23172.56.164.0/23172.56.166.0/23172.56.168.0/21172.56.168.0/23172.56.170.0/23172.56.172.0/23172.56.174.0/23172.56.176.0/21172.56.176.0/23172.56.178.0/23172.56.180.0/23172.56.182.0/23172.56.186.0/23172.56.188.0/23172.56.190.0/23172.56.192.0/21172.56.192.0/23172.56.194.0/23172.56.196.0/23172.56.198.0/23172.56.200.0/21172.56.200.0/23172.56.202.0/23172.56.204.0/23172.56.208.0/21172.56.208.0/23172.56.210.0/23172.56.212.0/23172.56.216.0/21172.56.216.0/23172.56.218.0/23172.56.220.0/23172.56.222.0/23172.56.224.0/21172.56.224.0/23172.56.226.0/23172.56.228.0/23172.56.232.0/21172.56.232.0/23172.56.234.0/23172.56.236.0/23172.56.238.0/23172.56.240.0/21172.56.240.0/23172.56.242.0/23172.56.244.0/23172.56.248.0/21172.56.248.0/23172.56.250.0/23172.56.252.0/23172.58.0.0/15172.58.0.0/21172.58.8.0/21172.58.24.0/21172.58.48.0/21172.58.56.0/21172.58.112.0/21172.58.120.0/21172.58.128.0/21172.58.144.0/21172.58.160.0/21172.58.176.0/21172.58.208.0/21172.58.240.0/21172.58.248.0/21172.59.0.0/21172.59.8.0/21172.59.16.0/21172.59.24.0/21172.59.32.0/21172.59.40.0/21172.59.48.0/21172.59.56.0/21172.59.64.0/21172.59.72.0/21172.59.80.0/21172.59.88.0/21172.59.96.0/21172.59.104.0/21172.59.112.0/21172.59.120.0/21172.59.128.0/21172.59.136.0/21172.59.144.0/21172.59.152.0/21172.59.160.0/21172.59.168.0/21172.59.176.0/21172.59.184.0/21172.59.192.0/21172.59.200.0/21172.59.208.0/21172.59.216.0/21172.59.224.0/21172.59.232.0/21172.59.240.0/21174.141.208.0/20206.29.168.0/22206.29.188.0/23206.29.190.0/23208.54.0.0/17208.54.1.0/24208.54.2.0/24208.54.4.0/24208.54.5.0/24208.54.7.0/24208.54.16.0/24208.54.18.0/24208.54.19.0/24208.54.20.0/24208.54.32.0/24208.54.34.0/24208.54.35.0/24208.54.36.0/24208.54.37.0/24208.54.39.0/24208.54.40.0/24208.54.44.0/24208.54.57.0/24208.54.66.0/24208.54.67.0/24208.54.70.0/24208.54.74.0/24208.54.75.0/24208.54.80.0/24208.54.83.0/24208.54.85.0/24208.54.86.0/24208.54.87.0/24208.54.88.0/24208.54.90.0/24208.54.96.0/19208.54.97.0/24208.54.100.0/22208.54.104.0/24208.54.110.0/23208.54.112.0/24208.54.117.0/24208.54.127.0/24208.54.128.0/19208.54.128.0/20208.54.134.0/23208.54.136.0/23208.54.138.0/23208.54.140.0/23208.54.142.0/24208.54.143.0/24208.54.144.0/20208.54.145.0/24208.54.153.0/24208.54.157.0/24208.54.158.0/24
IPv6 (258)
2001:4870:150::/442001:4870:e00b::/482607:f880:ff20::/442607:f880:ff30::/442607:fb90::/282607:fb90::/322607:fb90::/402607:fb90:200::/402607:fb90:300::/402607:fb90:400::/402607:fb90:500::/402607:fb90:600::/402607:fb90:700::/402607:fb90:800::/402607:fb90:b00::/402607:fb90:d00::/402607:fb90:e00::/402607:fb90:f00::/402607:fb90:fff::/482607:fb90:1200::/402607:fb90:1300::/402607:fb90:1700::/402607:fb90:1800::/402607:fb90:1c00::/402607:fb90:2000::/402607:fb90:2100::/402607:fb90:2200::/402607:fb90:2300::/402607:fb90:2400::/402607:fb90:2500::/402607:fb90:2700::/402607:fb90:2c00::/402607:fb90:2d00::/402607:fb90:3300::/402607:fb90:3500::/402607:fb90:3700::/402607:fb90:3900::/402607:fb90:3c00::/402607:fb90:3d00::/402607:fb90:3e00::/402607:fb90:3f00::/402607:fb90:4000::/402607:fb90:4200::/402607:fb90:4500::/402607:fb90:4800::/402607:fb90:4a00::/402607:fb90:4f00::/402607:fb90:5000::/402607:fb90:5200::/402607:fb90:5300::/402607:fb90:5500::/402607:fb90:5700::/402607:fb90:5800::/402607:fb90:5c00::/402607:fb90:5e00::/402607:fb90:5f00::/402607:fb90:6000::/402607:fb90:6100::/402607:fb90:6200::/402607:fb90:6300::/402607:fb90:6400::/402607:fb90:6800::/402607:fb90:6c00::/382607:fb90:6d00::/402607:fb90:7100::/402607:fb90:7300::/402607:fb90:7400::/402607:fb90:7500::/402607:fb90:7700::/402607:fb90:7800::/402607:fb90:7900::/402607:fb90:7a00::/402607:fb90:7e00::/402607:fb90:7f00::/402607:fb90:8000::/382607:fb90:8000::/402607:fb90:8100::/402607:fb90:8700::/402607:fb90:8a00::/402607:fb90:8b00::/402607:fb90:8d00::/402607:fb90:8e00::/402607:fb90:8f00::/402607:fb90:9000::/402607:fb90:9100::/402607:fb90:9200::/402607:fb90:9300::/402607:fb90:9500::/402607:fb90:9900::/402607:fb90:9a00::/402607:fb90:9b00::/402607:fb90:9c00::/402607:fb90:9d00::/402607:fb90:9e00::/402607:fb90:9f00::/402607:fb90:a000::/402607:fb90:a100::/402607:fb90:a200::/402607:fb90:a500::/402607:fb90:a600::/402607:fb90:a800::/402607:fb90:ac00::/402607:fb90:ad00::/402607:fb90:af00::/402607:fb90:b100::/402607:fb90:b200::/402607:fb90:b300::/402607:fb90:b500::/402607:fb90:b700::/402607:fb90:bb00::/402607:fb90:bd00::/402607:fb90:be00::/402607:fb90:bf00::/402607:fb90:c200::/402607:fb90:c300::/402607:fb90:c900::/402607:fb90:cb00::/402607:fb90:cd00::/402607:fb90:cf00::/402607:fb90:d100::/40
Show 138 more
2607:fb90:d300::/402607:fb90:d500::/402607:fb90:d700::/402607:fb90:d900::/402607:fb90:db00::/402607:fb90:dd00::/402607:fb90:df00::/402607:fb90:e000::/402607:fb90:e200::/402607:fb90:e300::/402607:fb90:e600::/402607:fb90:e800::/402607:fb90:e900::/402607:fb90:ea00::/402607:fb90:ec00::/402607:fb90:ee00::/402607:fb90:ef00::/402607:fb90:f000::/402607:fb90:f200::/402607:fb90:f400::/402607:fb90:f800::/402607:fb90:f900::/402607:fb90:fa00::/402607:fb90:fd00::/402607:fb90:fe00::/402607:fb91::/402607:fb91:100::/402607:fb91:200::/402607:fb91:300::/402607:fb91:400::/402607:fb91:500::/402607:fb91:600::/402607:fb91:700::/402607:fb91:800::/402607:fb91:900::/402607:fb91:a00::/402607:fb91:b00::/402607:fb91:c00::/402607:fb91:d00::/402607:fb91:e00::/402607:fb91:f00::/402607:fb91:1000::/402607:fb91:1100::/402607:fb91:1200::/402607:fb91:1300::/402607:fb91:1400::/402607:fb91:1500::/402607:fb91:1600::/402607:fb91:1700::/402607:fb91:1800::/402607:fb91:1900::/402607:fb91:1a00::/402607:fb91:1b00::/402607:fb91:1c00::/402607:fb91:1d00::/402607:fb91:1e00::/402607:fb91:1f00::/402607:fb91:2000::/402607:fb91:2100::/402607:fb91:2200::/402607:fb91:2400::/402607:fb91:2600::/402607:fb91:2700::/402607:fb91:2800::/402607:fb91:2c00::/402607:fb91:2d00::/402607:fb91:2e00::/402607:fb91:2f00::/402607:fb91:3000::/402607:fb91:3100::/402607:fb91:3200::/402607:fb91:3300::/402607:fb91:3500::/402607:fb91:3700::/402607:fb91:3800::/402607:fb91:3a00::/402607:fb91:3b00::/402607:fb91:3c00::/402607:fb91:3d00::/402607:fb91:3e00::/402607:fb91:3f00::/402607:fb91:4000::/402607:fb91:4100::/402607:fb91:4400::/402607:fb91:4500::/402607:fb91:4600::/402607:fb91:4800::/402607:fb91:4900::/402607:fb91:4b00::/402607:fb91:4c00::/402607:fb91:4d00::/402607:fb91:4e00::/402607:fb91:4f00::/402607:fb91:5000::/402607:fb91:5100::/402607:fb91:5200::/402607:fb91:5300::/402607:fb91:5600::/402607:fb91:5700::/402607:fb91:6100::/402607:fb91:7900::/402607:fb91:8200::/402607:fb91:8800::/402607:fb91:8b00::/402607:fb91:8c00::/402607:fb91:8d00::/402607:fb91:8e00::/402607:fb91:9000::/402607:fb91:bd00::/402607:fb92:100::/402607:fb92:400::/402607:fb92:500::/402607:fb92:600::/402607:fb92:900::/402607:fb92:d00::/402607:fb92:1600::/402607:fb92:1700::/402607:fb92:1800::/402607:fb92:1900::/402607:fb92:1c00::/402607:fb92:1e00::/402607:fb92:1f00::/402607:fb92:2000::/402607:fb92:2100::/402607:fb92:2200::/402607:fb92:2400::/402607:fb92:2500::/402607:fb92:2600::/402607:fb92:2700::/402607:fb92:2800::/402607:fb92:2900::/402607:fb92:2a00::/402607:fb92:2b00::/402607:fb92:2c00::/402607:fb92:2d00::/402607:fb92:2f00::/402607:fb92:3000::/402607:fb92:3100::/40

RPKI valid   RPKI invalid   no ROA covers it

Neighbors

Who AS21928 is reached through

The AS just before AS21928 in the paths our looking glass collectors hold, for 60 of its prefixes. Usually a transit provider, sometimes a peer. The number is how many of those prefixes it was seen on.

AS6939 HURRICANE 33AS174 COGENT-174 20AS6461 ZAYO-6461 10AS3356 LEVEL3 6AS13760 UNITI-FIBER 4
IRR

Routing registry objects

From the mirrored IRR databases (RADB, the five RIRs and more). Look it up live.

Sourceas-nameMaintained by
ARINAS-21928MNT-TMOBI
RADBTMobileUSAMAINT-AS21928

Route objects with origin AS21928: ARIN 850 · RADB 549

as-sets that list AS21928 (22)
AS-21928AS-393494AS-ANY2-RSAS-ATRATO:AS-PEERSAS-COMPUTEARIZONAAS-COMPUTEAZAS-GBLXAS-LEVEL3-CUSTOMERS-NAAS-LEVEL3-IPV6AS-LEVEL3-ORIGINS-NAAS-LUMEN-CUSTOMERS-ASNSAS-MFNXAS-SFMIX-RSAS-TMOBILEAS-TREENAS-XOAS-XO-BAS16471:AS-ADEXAS198949:AS-SDAS26737:AS-CONEAS37164:AS-ALLAS40300:AS-IX-CUSTOMERS
Tools

Check AS21928 live

ASN lookup and WHOISRPKI validatorASPA validatorIRR lookup