172.56.72.0/21

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:      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


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

Overlapping Ranges

BGP prefixes that contain 172.56.72.0/21

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 11 domain names hosted across 9 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
62.165.73.101	AS20847 Previder B.V.	`2.26ms` from Amsterdam, NL
72.209.90.5	AS63182 RapidScale, Inc	`0.46ms` from Ashburn, US
71.8.50.197	AS20115 Charter Communications LLC	`10.77ms` from Atlanta, US
69.254.217.21	AS7922 Comcast Cable Communications, LLC	`10.20ms` from Atlanta, US
40.134.35.197	AS7029 Windstream Communications LLC	`0.29ms` from Dallas, US
150.241.168.37	AS55201 SkyQuantum Internet Service	`0.22ms` from Fremont, US
81.18.177.165	AS39180 LASOTEL SAS	`1.12ms` from Lyon, FR
34.110.177.5	AS396982 Google LLC	`0.07ms` from Melbourne, AU
130.194.29.133	AS56132 Monash University,	`2.03ms` from Melbourne, AU
88.46.156.21	AS3269 Telecom Italia S.p.A.	`4.35ms` from Milan, IT
85.235.176.245	AS8359 MTS PJSC	`1.43ms` from Moscow, RU
117.248.9.117	AS9829 National Internet Backbone	`7.04ms` from Mumbai, IN
58.215.120.133	AS23650 AS Number for CHINANET jiangsu province backbone	`3.55ms` from Nanjing, CN
47.5.10.229	AS33588 Charter Communications LLC	`17.88ms` from Seattle, US
218.158.163.117	AS4766 Korea Telecom	`3.08ms` from Seoul, KR
220.94.241.21	AS4766 Korea Telecom	`1.63ms` from Seoul, KR
88.118.161.149	AS8764 Telia Lietuva, AB	`3.02ms` from Siauliai, LT
52.81.23.85	AS55960 Beijing Guanghuan Xinwang Digital	`3.63ms` from Beijing, CN
24.83.222.117	AS6327 Shaw Communications	`1.00ms` from Calgary, CA
119.52.207.53	AS4837 CHINA UNICOM China169 Backbone	`6.35ms` from Changchun, CN
142.0.58.101	AS33725 Watch Communications	`11.50ms` from Chicago, US
102.160.69.165	AS30999 EMTEL LIMITED	`8.64ms` from Ebene, MU
45.229.184.53	AS267132 CONECTA ELETRICIDADE E SERVICOS LTDA ME	`14.88ms` from Fortaleza, BR
59.44.40.53	AS4134 CHINANET-BACKBONE	`2.42ms` from Liaoyang, CN
98.152.160.21	AS20001 Charter Communications Inc	`2.26ms` from Los Angeles, US

Traceroute

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

traceroute -a -n -q1 -f4 -m7 172.56.73.5

traceroute to 172.56.73.5 (172.56.73.5): 7 hops max, 52 byte packets

4 [AS21928] 100.199.0.57 0.065 ms

5 *

6 *

7 *

Measurement taken from

IPinfo ProbeNet in Liuzhou, CN

On March 21st 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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