155.166.38.0/23

AS20057 · AT&T Enterprises, LLC

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Summary

Country	United States
Domain	att.com
ASN	AS20057
Parent Range	155.166.0.0/16
Registry	ARIN
ID	ATT-MOBILITY-LLC-155-166-0-0

WHOIS Details

NetHandle:      NET-155-166-0-0-1
OrgID:          AEL-360
Parent:         NET-155-0-0-0-0
NetName:        ATT-MOBILITY-LLC-155-166-0-0
NetRange:       155.166.0.0 - 155.166.255.255
NetType:        allocation
RegDate:        1992-03-24
Updated:        2025-03-18
Source:         ARIN


OrgID:          AEL-360
OrgName:        AT&T Enterprises, LLC
CanAllocate:    
Street:         208 S. Akard St.
City:           Dallas
State/Prov:     TX
Country:        US
PostalCode:     75202
RegDate:        2024-11-22
Updated:        2025-10-29
OrgAdminHandle: ZS44-ARIN
OrgTechHandle:  ICC-ARIN
OrgTechHandle:  ZS44-ARIN
OrgAbuseHandle: ABUSE7-ARIN
OrgRoutingHandle:   ROUTI59-ARIN
Source:         ARIN


POCHandle:      ZS44-ARIN
IsRole:         Y
LastName:       IPAdmin-ATT Internet Services
FirstName:      
Street:         7277 164th Ave NE
Street:         Attn: IP Management
City:           Redmond
State/Prov:     WA
Country:        US
PostalCode:     98052
RegDate:        2000-05-17
Updated:        2025-08-18
OfficePhone:    +1-888-510-5545
Mailbox:        [email protected]
Mailbox:        [email protected]
Source:         ARIN


POCHandle:      ABUSE7-ARIN
IsRole:         Y
LastName:       abuse
FirstName:      
Street:         2701 W 15th ST
City:           Plano
State/Prov:     TX
Country:        US
PostalCode:     75075
RegDate:        2002-08-24
Updated:        2025-08-18
OfficePhone:    +1-919-319-8167
Mailbox:        [email protected]
Source:         ARIN


POCHandle:      ICC-ARIN
IsRole:         Y
LastName:       IP Team
FirstName:      
Street:         200 S. Laurel AVE
City:           MIDDLETOWN
State/Prov:     NJ
Country:        US
PostalCode:     07748
RegDate:        2002-09-24
Updated:        2025-08-18
OfficePhone:    +1-888-876-2382
Mailbox:        [email protected]
Source:         ARIN

Overlapping Ranges

BGP prefixes that contain 155.166.38.0/23

Range	ASN	Company	Num of IPs
155.166.0.0/16	AS20057	AT&T Enterprises, LLC	65,536

Nearby Ranges

BGP prefixes that overlap with 155.166.0.0/16

Range	ASN	Company	Num of IPs
155.166.0.0/16	AS20057	AT&T Enterprises, LLC	65,536

Hosted domains

There are no domains currently hosted on this ASN.

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

4 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
155.166.38.157	AS20057 AT&T Enterprises, LLC	`36.91ms` from San Jose, US
155.166.39.59	AS20057 AT&T Enterprises, LLC	`76.56ms` from San Jose, US

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
52.157.89.39	AS8075 Microsoft Corporation	`0.25ms` from Amsterdam, NL
1.28.97.151	AS139007 UNICOM InnerMongolia province network	`11.97ms` from Beijing, CN
111.165.206.55	AS4837 CHINA UNICOM China169 Backbone	`4.78ms` from Beijing, CN
69.204.38.231	AS11351 Charter Communications Inc	`17.88ms` from Chicago, US
58.144.162.23	AS4837 CHINA UNICOM China169 Backbone	`0.29ms` from Chongqing, CN
125.88.187.167	AS4134 CHINANET-BACKBONE	`2.74ms` from Guangzhou, CN
38.239.233.247	AS134548 DXTL Tseung Kwan O Service	`0.66ms` from Hong Kong, HK
41.10.179.167	AS36994 Vodacom	`2.69ms` from Johannesburg, ZA
192.110.206.39	AS26652 Airstream Communications, LLC	`4.29ms` from Lincoln, US
88.13.196.55	AS3352 TELEFONICA DE ESPANA S.A.U.	`8.70ms` from Madrid, ES
84.65.161.7	AS5378 Vodafone Limited	`3.04ms` from Manchester, GB
93.174.128.87	AS47478 MSTN CJSC	`0.69ms` from Moscow, RU
217.82.28.215	AS3320 Deutsche Telekom AG	`1.54ms` from Nuernberg, DE
45.226.122.119	AS266433 Super On Telecom	`3.41ms` from Osasco, BR
172.233.24.23	AS63949 Akamai Connected Cloud	`0.23ms` from Osasco, BR
80.233.234.135	AS5518 SIA Tet	`1.62ms` from Riga, LV
211.221.82.183	AS4766 Korea Telecom	`2.03ms` from Seoul, KR
220.137.4.231	AS3462 Data Communication Business Group	`1.42ms` from Taipei, TW
123.198.91.215	AS2527 Sony Network Communications Inc.	`1.50ms` from Tokyo, JP
79.166.188.39	AS3329 VODAFONE-PANAFON HELLENIC TELECOMMUNICATIONS COMPANY SA	`1.71ms` from Athens, GR
87.151.52.167	AS3320 Deutsche Telekom AG	`4.24ms` from Duesseldorf, DE
130.225.91.231	AS1835 Forskningsnettet - Danish network for Research and Education	`3.85ms` from Falkenberg, SE
62.68.13.39	AS6735 TNG Stadtnetz GmbH	`6.22ms` from Frankfurt am Main, DE
14.240.185.183	AS45899 VNPT Corp	`5.66ms` from Ho Chi Minh City, VN
117.66.146.183	AS4134 CHINANET-BACKBONE	`10.41ms` from Huai'an, CN

Traceroute

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

traceroute -a -n -q1 -f6 155.166.38.157

traceroute to 155.166.38.157 (155.166.38.157): 64 hops max, 52 byte packets

6 [AS7018] 12.245.179.34 2.791 ms

7 [AS7018] 12.245.179.33 2.387 ms

8 [AS7018] 32.130.91.198 3.586 ms

9 [AS7018] 32.130.20.156 3.92 ms

10 [AS7018] 32.130.25.177 4.813 ms

11 [AS7018] 12.83.180.93 5.244 ms

12 [AS7018] 12.249.2.54 4.212 ms

13 [AS20057] 166.147.125.36 5.44 ms

14 *

15 *

16 *

17 [AS20057] 155.166.38.157 39.023 ms

Measurement taken from

IPinfo ProbeNet in San Jose, US

On January 30th 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.

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