172.56.208.0/21

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 172.56.208.0/21

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 4 domain names hosted across 3 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
204.0.9.69	AS2914 NTT America, Inc.	`0.21ms` from Ashburn, US
72.84.116.165	AS701 Verizon Business	`9.71ms` from Ashburn, US
209.96.214.53	AS7029 Windstream Communications LLC	`0.29ms` from Atlanta, US
113.47.151.181	AS55990 Huawei Cloud Service data center	`14.49ms` from Beijing, CN
193.116.76.117	AS7545 TPG Telecom Limited	`1.57ms` from Brisbane, AU
50.66.149.117	AS6327 Shaw Communications	`4.25ms` from Calgary, CA
87.151.119.245	AS3320 Deutsche Telekom AG	`4.33ms` from Duesseldorf, DE
222.252.28.245	AS45899 VNPT Corp	`0.92ms` from Hanoi, VN
202.30.120.5	AS9755 Korea Internet Security Agency	`5.66ms` from Incheon, KR
67.147.223.85	AS19901 Brightspeed	`3.55ms` from Little Rock, US
65.60.90.197	AS14265 TPx Communications	`5.32ms` from Los Angeles, US
79.7.178.53	AS3269 Telecom Italia S.p.A.	`6.51ms` from Milan, IT
66.188.224.69	AS20115 Charter Communications LLC	`9.42ms` from Minneapolis, US
77.95.11.69	AS43020 OPTIC-TELECOM LTD	`1.57ms` from Moscow, RU
88.173.123.213	AS12322 Free SAS	`12.62ms` from Paris, FR
143.107.157.5	AS28571 UNIVERSIDADE DE SAO PAULO	`6.46ms` from Sao Paulo, BR
13.214.23.37	AS16509 Amazon.com, Inc.	`0.36ms` from Singapore, SG
92.34.243.133	AS8434 Telenor Sverige AB	`1.91ms` from Stockholm, SE
98.175.228.101	AS22773 Cox Communications Inc.	`2.54ms` from Tulsa, US
88.223.58.53	AS24852 UAB INIT	`0.66ms` from Vilnius, LT
185.215.75.37	AS210104 Timplus sp. z o.o.	`0.34ms` from Warsaw, PL
130.89.14.69	AS1133 University Twente	`3.63ms` from Amsterdam, NL
193.27.87.5	AS30870 Trans-iX B.V.	`1.04ms` from Amsterdam, NL
97.130.96.229	AS6167 Verizon Business	`10.93ms` from Chicago, US
78.72.128.229	AS3301 Telia Company AB	`6.05ms` from Copenhagen, DK

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 172.56.211.242

traceroute to 172.56.211.242 (172.56.211.242): 7 hops max, 52 byte packets

4 [AS21928] 100.199.0.57 0.078 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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