203.166.172.0/24

AS138421 · China Unicom

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Summary

Country	China
Domain	21viacloud.com
ASN	AS138421
Registry	APNIC
ID	ENTRUSTNET

WHOIS Details

inetnum:        203.166.160.0 - 203.166.191.255
netname:        ENTRUSTNET
descr:          Entrust Network Inc.
descr:          Building A2, 501 liyuan road, huangpu district, Shanghai
country:        CN
admin-c:        YW7118-AP
tech-c:         JS4343-AP
abuse-c:        AC1601-AP
status:         ALLOCATED PORTABLE
mnt-by:         MAINT-CNNIC-AP
mnt-irt:        IRT-ENTRUSTNET-CN
mnt-lower:      MAINT-CNNIC-AP
mnt-routes:     MAINT-CNCGROUP-RR
last-modified:  2023-11-28T00:57:18Z
source:         APNIC

irt:            IRT-ENTRUSTNET-CN
address:        Building A2, 501 liyuan road, huangpu district, Shanghai
e-mail:         zhou.yu@21viacloud.com
abuse-mailbox:  zhou.yu@21viacloud.com
admin-c:        YW7118-AP
tech-c:         JS4343-AP
auth:           # Filtered
mnt-by:         MAINT-CNNIC-AP
last-modified:  2025-11-18T00:34:39Z
source:         APNIC

role:           ABUSE CNNICCN
country:        ZZ
address:        Beijing, China
phone:          +000000000
e-mail:         ipas@cnnic.cn
admin-c:        IP50-AP
tech-c:         IP50-AP
nic-hdl:        AC1601-AP
remarks:        Generated from irt object IRT-CNNIC-CN
remarks:        ipas@cnnic.cn is invalid
abuse-mailbox:  ipas@cnnic.cn
mnt-by:         APNIC-ABUSE
last-modified:  2025-09-19T17:20:32Z
source:         APNIC

person:         Wu Yucheng
address:        Building A2, 501 liyuan road, huangpu district, Shanghai
country:        CN
phone:          +86-021-58667922
e-mail:         wu.yucheng@21viacloud.com
nic-hdl:        JS4343-AP
mnt-by:         MAINT-CNNIC-AP
last-modified:  2020-08-10T03:12:06Z
source:         APNIC

person:         Zhou Yu
address:        Building A2, 501 liyuan road, huangpu district, Shanghai
country:        CN
phone:          +86-021-63015500-160
e-mail:         zhou.yu@21viacloud.com
nic-hdl:        YW7118-AP
mnt-by:         MAINT-CNNIC-AP
last-modified:  2020-08-10T03:12:06Z
source:         APNIC

Nearby Ranges

BGP prefixes that overlap with 203.166.0.0/16

Range	ASN	Company	Num of IPs
203.166.0.0/17	AS12234	Verizon Australia PTY Limited	32,768
203.166.0.0/17	AS703	Verizon Australia PTY Limited	32,768
203.166.224.0/19	AS7545	iiNet Limited	8,192
203.166.128.0/20	AS10031	WEBSATMEDIA PTE LTD	4,096
203.166.192.0/20	AS9326	PT Centrin Online Prima	4,096
203.166.220.0/22	AS63981	43/F, AIA Tower, 183 Electric Road, North Point, Hong Kong	1,024
203.166.140.0/22	AS10031	Cloud Service	1,024
203.166.158.0/23	AS139719	WEBSATMEDIA PTE LTD	512
203.166.219.0/24	AS45657	NSW Rural Fire Service	256
203.166.218.0/24	AS56307	NSW Education Standards Authority	256
203.166.159.0/24	AS10031	WebSatMedia	256
203.166.216.0/24	AS133736	TASMANET	256
203.166.158.0/24	AS139719	Cloud Service	256
203.166.217.0/24	AS45319	Universitas Bhayangkara	256

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

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

IP Address	ASN	Details
203.166.172.73	AS138421 China Unicom	`2.90ms` from Shanghai, CN

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
34.136.76.184	AS396982 Google LLC	`0.35ms` from Council Bluffs, US
147.75.7.136	AS33070 Rackspace Hosting	`0.85ms` from Dallas, US
52.111.227.40	AS8075 Microsoft Corporation	`0.17ms` from Des Moines, US
90.100.175.40	AS3215 Orange S.A.	`13.32ms` from Frankfurt am Main, DE
194.63.114.24	AS1273 Vodafone Group PLC	`4.00ms` from London, GB
92.220.101.232	AS29695 Lyse Tele AS	`6.73ms` from Oslo, NO
20.214.190.216	AS8075 Microsoft Corporation	`0.30ms` from Seoul, KR
47.106.202.200	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`0.11ms` from Shenzhen, CN
187.62.215.216	AS28165 Wireless Comm Services LTDA	`0.77ms` from São Paulo, BR
199.192.113.56	AS396982 Google LLC	`0.23ms` from Chang-hua, TW
113.184.132.56	AS45899 VNPT Corp	`1.98ms` from Ho Chi Minh City, VN
211.201.127.56	AS9318 SK Broadband Co Ltd	`0.86ms` from Incheon, KR
108.29.31.72	AS701 Verizon Business	`2.17ms` from New York City, US
38.64.114.184	AS19356 Tohono O'Odham Utility Authority	`4.98ms` from Phoenix, US
39.175.68.248	AS56041 China Mobile communications corporation	`8.26ms` from Shanghai, CN
126.77.126.136	AS17676 SoftBank Corp.	`2.89ms` from Tokyo, JP
153.217.9.216	AS4713 NTT DOCOMO BUSINESS,Inc.	`3.75ms` from Tokyo, JP
173.194.60.168	AS15169 Google LLC	`0.28ms` from Atlanta, US
87.145.28.200	AS3320 Deutsche Telekom AG	`4.97ms` from Duesseldorf, DE
45.82.192.56	AS15943 wilhelm.tel GmbH	`1.23ms` from Hamburg, DE
14.181.57.248	AS45899 VNPT Corp	`1.91ms` from Hanoi, VN
116.111.102.216	AS7552 Viettel Group	`1.36ms` from Hanoi, VN
89.151.194.56	AS34087 NTE TELEKOM AS	`9.28ms` from Oslo, NO
150.135.109.216	AS1706 The University of Arizona	`4.03ms` from Phoenix, US
64.202.186.168	AS398101 GoDaddy.com, LLC	`1.17ms` from Phoenix, 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 203.166.172.65

traceroute to 203.166.172.65 (203.166.172.65): 64 hops max, 52 byte packets

5 [AS6939] 184.105.223.226 148.988 ms

6 [AS6939] 66.160.133.143 164.855 ms

7 [AS4837] 219.158.96.33 303.989 ms

8 [AS4837] 219.158.98.93 300.267 ms

9 *

10 *

11 *

12 [AS138421] 220.196.252.174 331.168 ms

13 [AS138421] 210.51.63.70 334.107 ms

14 [AS138421] 203.166.172.65 330.526 ms

Measurement taken from

IPinfo ProbeNet in Hong Kong, HK

On February 16th 2026

What are IP address ranges?

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