203.166.188.0/24

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
203.166.140.0/22 AS10031 Cloud Service 1,024
203.166.220.0/22 AS63981 43/F, AIA Tower, 183 Electric Road, North Point, Hong Kong 1,024
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
203.166.158.0/24 AS139719 Cloud Service 256
203.166.216.0/24 AS133736 TASMANET 256
203.166.217.0/24 AS45319 Universitas Bhayangkara 256

Hosted domains

There are no domains currently hosted on this ASN.

Hosted domains API

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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
203.166.188.106 AS138421 China Unicom 5.55ms 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
128.24.60.104 AS8075 Microsoft Corporation 0.22ms from Boydton, US
20.74.187.120 AS8075 Microsoft Corporation 1.09ms from Dubai, AE
91.58.172.200 AS3320 Deutsche Telekom AG 4.17ms from Hamburg, DE
123.213.137.168 AS9318 SK Broadband Co Ltd 5.36ms from Incheon, KR
89.141.153.8 AS12430 VODAFONE ESPANA S.A.U. 4.63ms from Madrid, ES
68.132.119.72 AS701 Verizon Business 2.44ms from New York City, US
126.119.132.184 AS17676 SoftBank Corp. 2.34ms from Osaka, JP
171.101.73.216 AS17552 True Online 6.64ms from Bangkok, TH
158.121.7.200 AS1968 UMASSNET 9.94ms from Boston, US
173.91.194.168 AS10796 Charter Communications Inc 9.79ms from Columbus, US
64.233.157.72 AS23404 Ritter Communications 11.27ms from Dallas, US
81.97.40.248 AS5089 Virgin Media Limited 7.80ms from Erith, GB
129.204.241.72 AS45090 Shenzhen Tencent Computer Systems Company Limited 2.19ms from Guangzhou, CN
91.35.201.104 AS3320 Deutsche Telekom AG 1.81ms from Hamburg, DE
222.255.110.184 AS45899 VNPT Corp 3.12ms from Hanoi, VN
86.142.59.184 AS2856 British Telecommunications PLC 2.49ms from London, GB
126.59.141.40 AS17676 SoftBank Corp. 1.82ms from Osaka, JP
186.201.144.200 AS10429 TELEFÔNICA BRASIL S.A 1.21ms from Osasco, BR
112.245.185.104 AS4837 CHINA UNICOM China169 Backbone 5.27ms from Qingdao, CN
89.193.239.120 AS8011 MongoDB, Inc. 0.14ms from Reston, US
203.105.218.40 AS132789 Pivotel Group Pty Limited 0.67ms from Sydney, AU
223.200.100.8 AS4782 Data Communication Business Group 6.54ms from Taipei, TW
123.188.14.56 AS4837 CHINA UNICOM China169 Backbone 13.21ms from Tieling, CN
162.158.149.152 AS13335 Cloudflare, Inc. 7.91ms from Tunis, TN
217.241.46.152 AS3320 Deutsche Telekom AG 10.18ms from Frankfurt am Main, DE

Traceroute

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

$
traceroute -a -n -q1 -f4 203.166.188.118
traceroute to 203.166.188.118 (203.166.188.118): 64 hops max, 52 byte packets
4 [AS749] 11.94.199.237 4.354 ms
5 *
6 *
7 *
8 [AS17621] 210.22.67.50 4.758 ms
10 [AS138421] 210.51.63.70 4.621 ms
11 [AS4811] 211.152.63.37 6.395 ms
12 [AS4811] 211.152.63.194 5.623 ms
13 [AS4811] 211.152.63.21 5.115 ms
14 *
Measurement taken from IPinfo ProbeNet in Shanghai, CN
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.

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