ASN AS21928 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS21928?

AS21928 is listed under T Mobile USA, Inc..

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS21928 T Mobile USA, Inc. | IPGeolocation.io

ASN Lookup Tool

T Mobile USA, Inc. t-mobile.com

US 587 Routes

AS Data

AS21928

AS21928 – T Mobile USA, Inc.

AS Number	21928
AS Name	T-MOBILE-AS21928
Organization	T Mobile USA, Inc.(tmobi)
Country	US
Website	t-mobile.com
Number of IPv4 Routes	337
Number of IPv6 Routes	250
ASN type	ISP
Registry	ARIN
Date Allocated	2002-06-12

ASN Intelligence API for production workflows

Use ASN data for AS21928 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
208.54.142.0/24	AS21928	T Mobile USA, Inc.	T Mobile USA, Inc.	256
172.58.0.0/15	AS21928	T Mobile USA, Inc.	T Mobile USA, Inc.	131072
2607:fb90:3c00::/40	AS21928	T Mobile USA, Inc.	T Mobile USA, Inc.	~309×10²⁴
172.56.18.0/23	AS21928	T Mobile USA, Inc.	T Mobile USA, Inc.	512
66.94.29.0/24	AS21928	T Mobile USA, Inc.	T Mobile USA, Inc.	256
208.54.112.0/24	AS21928	T Mobile USA, Inc.	T Mobile USA, Inc.	256
100.128.0.0/9	AS21928	T Mobile USA, Inc.	T Mobile USA, Inc.	8388608
2607:fb90:2300::/40	AS21928	T Mobile USA, Inc.	T Mobile USA, Inc.	~309×10²⁴
2607:fb91:2d00::/40	AS21928	T Mobile USA, Inc.	T Mobile USA, Inc.	~309×10²⁴
2607:fb90:700::/40	AS21928	T Mobile USA, Inc.	T Mobile USA, Inc.	~309×10²⁴

Raw Whois Response

#
# 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.
#

Parsed Whois Response

Peers

AS Number	Description	Country
AS21738	Rozint	US
AS393577	Tritan Development	US
AS401703	Ordinal Advisors LLC	US
AS9505	Chunghwa Telecom Co., Ltd.	TW
AS38880	Micron21 Datacentre Pty Ltd	AU
AS14537	Continent 8 LLC	US
AS4230	CLARO S.A.	BR
AS267256	ONETIS TECNOLOGIA LTDA	BR
AS37468	Angola Cables	AO
AS199524	G-Core Labs S.A.	LU

Upstreams

AS Number	Description	Country
AS9304	HGC Global Communications Limited	HK
AS7195	EDGEUNO S.A.S	CO
AS9505	Chunghwa Telecom Co., Ltd.	TW
AS6939	Hurricane Electric LLC	US
AS64289	Macarne.com	US
AS32621	Twin City VoIP, Inc.	US
AS33891	Core Backbone GmbH	DE
AS4230	CLARO S.A.	BR
AS37468	Angola Cables	AO
AS394256	Tech Futures Interactive Inc.	CA