172.56.104.0/21

AS21928 · T-Mobile USA, Inc.

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Summary

Country	United States
Domain	t-mobile.com
ASN	AS21928
Parent Range	172.32.0.0/11
Registry	ARIN
ID	TMO9

WHOIS Details

NetHandle:      NET-172-32-0-0-1
OrgID:          TMOBI
Parent:         NET-172-0-0-0-0
NetName:        TMO9
NetRange:       172.32.0.0 - 172.63.255.255
NetType:        allocation
Comment:        Geofeed https://raw.githubusercontent.com/tmobile/tmus-geofeed/main/tmus-geo-ip.txt
RegDate:        2012-09-18
Updated:        2020-11-18
Source:         ARIN


OrgID:          TMOBI
OrgName:        T-Mobile USA, Inc.
CanAllocate:    
Street:         12920 SE 38th Street
City:           Bellevue
State/Prov:     WA
Country:        US
PostalCode:     98006
RegDate:        2003-01-02
Updated:        2017-01-28
OrgAdminHandle: DNSAD11-ARIN
OrgTechHandle:  DNSAD11-ARIN
OrgAbuseHandle: ABUSE4857-ARIN
Source:         ARIN


POCHandle:      ABUSE4857-ARIN
IsRole:         Y
LastName:       abuse
FirstName:      
Street:         12920 SE 38th Street
City:           Bellevue
State/Prov:     WA
Country:        US
PostalCode:     98006
RegDate:        2014-09-23
Updated:        2025-05-27
OfficePhone:    +1-888-662-4662
Mailbox:        abuse@t-mobile.com
Source:         ARIN


POCHandle:      DNSAD11-ARIN
IsRole:         Y
LastName:       DNS Administrators
FirstName:      
Street:         12920 SE 38th Street
City:           Bellevue
State/Prov:     WA
Country:        US
PostalCode:     98027
RegDate:        2003-01-02
Updated:        2026-01-08
OfficePhone:    +1-888-662-4662
Mailbox:        ARINtechcontact@t-mobile.com
Source:         ARIN

Overlapping Ranges

BGP prefixes that contain 172.56.104.0/21

Range	ASN	Company	Num of IPs
172.32.0.0/11	AS21928	T-Mobile USA, Inc.	2,097,152

Nearby Ranges

BGP prefixes that overlap with 172.56.0.0/16

Range	ASN	Company	Num of IPs
172.32.0.0/11	AS21928	T-Mobile USA, Inc.	2,097,152

Hosted domains

There are 13 domain names hosted across 13 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.

Useful for Cybersecurity

Read more

Pingable IPs

No IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
209.172.224.133	AS393289 Mercer University	`0.29ms` from Atlanta, US
76.195.77.165	AS7018 AT&T Enterprises, LLC	`4.21ms` from Atlanta, US
125.20.98.5	AS9498 BHARTI Airtel Ltd.	`0.76ms` from Bengaluru, IN
181.53.71.133	AS14080 Telmex Colombia S.A.	`1.00ms` from Bogota, CO
73.186.5.69	AS7922 Comcast Cable Communications, LLC	`9.13ms` from Boston, US
119.84.250.85	AS4134 CHINANET-BACKBONE	`9.89ms` from Chongqing, CN
24.248.45.181	AS22773 Cox Communications Inc.	`11.93ms` from Dallas, US
204.25.224.5	AS401307 Michigan Statewide Educational Network	`8.06ms` from Grand Rapids, US
151.250.211.181	AS34984 Superonline Iletisim Hizmetleri A.S.	`3.07ms` from Izmir, TR
62.73.141.197	AS15533 Redcentric Solutions Ltd	`1.36ms` from London, GB
185.34.252.117	AS20860 IOMART CLOUD SERVICES LIMITED	`0.38ms` from Maidenhead, GB
178.80.40.245	AS35819 Etihad Etisalat, a joint stock company	`3.36ms` from Manama, BH
86.229.76.37	AS3215 Orange S.A.	`2.24ms` from Marseille, FR
92.162.105.229	AS3215 Orange S.A.	`5.25ms` from Paris, FR
20.19.149.165	AS8075 Microsoft Corporation	`0.17ms` from Paris, FR
211.64.120.213	AS4538 China Education and Research Network Center	`7.37ms` from Qingdao, CN
4.151.50.213	AS8075 Microsoft Corporation	`0.23ms` from San Antonio, US
202.218.169.69	AS4694 IDC Frontier Inc.	`0.85ms` from Tokyo, JP
105.101.42.245	AS36947 Telecom Algeria	`9.02ms` from Valencia, ES
86.95.122.85	AS1136 KPN B.V.	`2.90ms` from Amsterdam, NL
154.59.116.229	AS174 Cogent Communications, LLC	`1.86ms` from Amsterdam, NL
20.50.26.37	AS8075 Microsoft Corporation	`0.22ms` from Amsterdam, NL
107.138.163.5	AS7018 AT&T Enterprises, LLC	`10.14ms` from Chicago, US
73.8.104.133	AS7922 Comcast Cable Communications, LLC	`5.41ms` from Chicago, US
35.225.37.181	AS396982 Google LLC	`0.12ms` from Council Bluffs, US

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

traceroute -a -n -q1 -f5 -m10 172.56.106.140

traceroute to 172.56.106.140 (172.56.106.140): 10 hops max, 52 byte packets

5 [AS20940] 23.203.158.50 0.603 ms

6 [AS20940] 23.207.232.33 0.616 ms

7 [AS21928] 66.94.0.36 0.788 ms

8 *

9 *

10 *

Measurement taken from

IPinfo ProbeNet in Santa Clara, US

On March 13th 2026

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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