203.166.186.0/23

AS138421  ·  China Unicom

Need more data or want to access it via API or data downloads? Sign up to get free access

Sign up for free ›

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 5 domain names hosted across 4 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
203.166.186.61 teaex-sh.cn 2
203.166.186.80 img-camera.cn 1
203.166.186.56 cncisa.com 1
203.166.187.110 kdffw.cn 1

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

Pingable IPs

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

IP Address ASN Details
203.166.187.1 AS138421 China Unicom 5.18ms from Shanghai, CN
203.166.186.126 AS138421 China Unicom 5.57ms 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
134.202.63.119 AS54103 MOD Mission Critical, LLC 0.19ms from Atlanta, US
98.217.206.247 AS7922 Comcast Cable Communications, LLC 4.48ms from Boston, US
217.235.213.103 AS3320 Deutsche Telekom AG 5.12ms from Frankfurt am Main, DE
106.74.26.247 AS133118 China Unicom IP network 3.32ms from Hohhot, CN
64.59.168.7 AS6327 Shaw Communications 0.44ms from Kelowna, CA
69.33.159.167 AS6079 RCN 0.17ms from New York City, US
69.242.93.39 AS7922 Comcast Cable Communications, LLC 9.66ms from New York City, US
213.73.1.71 AS15798 University of Warmia and Mazury in Olsztyn, Poland 0.52ms from Olsztyn, PL
44.206.248.55 AS14618 Amazon.com, Inc. 0.41ms from Reston, US
114.85.110.119 AS4812 China Telecom (Group) 2.76ms from Shanghai, CN
89.124.88.247 AS216071 SERVERS TECH FZCO 0.44ms from Amsterdam, NL
78.48.245.167 AS6805 Telefonica Germany GmbH & Co.OHG 3.29ms from Duesseldorf, DE
38.165.14.231 AS400619 AROSSCLOUD INC. 1.46ms from Hong Kong, HK
193.138.175.7 AS47952 ICT BULUT BILISIM A.S. 0.29ms from Istanbul, TR
109.51.166.87 AS2860 NOS COMUNICACOES, S.A. 3.87ms from Lisbon, PT
151.64.68.135 AS1267 WIND TRE S.P.A. 3.98ms from Milan, IT
140.249.206.23 AS58541 Qingdao,266000 0.98ms from Qingdao, CN
107.148.39.39 AS394432 PEG TECH INC 0.86ms from Singapore, SG
178.194.89.247 AS3303 Swisscom (Switzerland) Ltd 1.31ms from Zuerich, CH
62.235.246.135 AS5432 Proximus NV 1.20ms from Brussels, BE
34.80.90.199 AS396982 Google LLC 0.15ms from Chang-hua, TW
119.224.88.167 AS9790 Two Degrees Networks Limited 1.66ms from Christchurch, NZ
14.236.132.151 AS45899 VNPT Corp 3.50ms from Da Nang, VN
20.98.135.55 AS8075 Microsoft Corporation 0.56ms from Des Moines, US
82.181.186.119 AS16086 DNA Oyj 9.99ms from Helsinki, FI

Traceroute

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

$
traceroute -a -n -q1 203.166.186.1
traceroute to 203.166.186.1 (203.166.186.1): 64 hops max, 52 byte packets
1 [AS15169] 72.14.235.78 3.295 ms
3 [AS5511] 193.251.133.3 13.499 ms
4 *
5 [AS4837] 219.158.21.109 230.738 ms
6 *
7 *
8 *
9 *
11 [AS138421] 210.51.63.70 285.636 ms
12 [AS4811] 211.152.63.37 189.574 ms
13 [AS4811] 211.152.63.194 192.196 ms
14 [AS4811] 211.152.63.21 191.383 ms
15 [AS138421] 203.166.186.1 260.011 ms
Measurement taken from IPinfo ProbeNet in Turin, IT
On

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.

An API built with users in mind: reliable, accurate, and easy-to-use

Discover why industry-leading companies around the globe love our data. IPinfo's accurate insights fuel use cases from cybersecurity, data enrichment, web personalization, and much more.

IPinfo for all your IP geolocation needs

Our IP tools

Explore all tools
What is my IP

What is my IP

Test our data accuracy by viewing insights from your IP address.

See your IP address
Map IPs

Map IPs

Paste up to 500,000 IPs to see where they're located on a map.

Try Map IPs
Summarize IPs

Summarize IPs

Use our data visualization tool to create a visual overview of multiple IPs.

Try Summarize IPs