166.111.0.0/18

AS4538 · China Education and Research Network Center

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Summary

Country	China
Domain	tsinghua.edu.cn
ASN	AS4538
Parent Range	166.111.0.0/16
Registry	APNIC
ID	TSINGHUA-CN

WHOIS Details

inetnum:        166.111.0.0 - 166.111.255.255
netname:        TSINGHUA-CN
descr:          Tsinghua University
country:        CN
org:            ORG-CEAR1-AP
admin-c:        CER-AP
tech-c:         CER-AP
abuse-c:        AC1685-AP
status:         ALLOCATED PORTABLE
mnt-by:         APNIC-HM
mnt-lower:      MAINT-TSINGHUA-CERNET
mnt-routes:     MAINT-TSINGHUA-CERNET
mnt-irt:        IRT-CERNET-AP
last-modified:  2023-09-06T06:09:18Z
source:         APNIC

irt:            IRT-CERNET-AP
address:        Network Research Center,
address:        Main Bldg, Tsinghua Univ
address:        Beijing 100084, China
phone:          +86-10-62784301
fax-no:         +86-10-62785933
e-mail:         abuse@cernet.edu.cn
abuse-mailbox:  abuse@cernet.edu.cn
admin-c:        CER-AP
tech-c:         CER-AP
auth:           # Filtered
remarks:        timezone GMT+8
remarks:        http://www.ccert.edu.cn
remarks:        abuse@cernet.edu.cn was validated on 2025-08-15
mnt-by:         MAINT-CERNET-AP
last-modified:  2025-11-18T00:26:28Z
source:         APNIC

organisation:   ORG-CEAR1-AP
org-name:       China Education and Research Network (CERNET)
country:        CN
address:        FIT 3-220,
address:        Tsinghua University
phone:          +86-10-62785983
fax-no:         +86-10-62785933
e-mail:         hostmaster@cernic.net
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2018-09-13T12:56:34Z
source:         APNIC

role:           ABUSE CERNETAP
country:        ZZ
address:        Network Research Center,
address:        Main Bldg, Tsinghua Univ
address:        Beijing 100084, China
phone:          +86-10-62784301
e-mail:         abuse@cernet.edu.cn
admin-c:        CER-AP
tech-c:         CER-AP
nic-hdl:        AC1685-AP
remarks:        Generated from irt object IRT-CERNET-AP
remarks:        abuse@cernet.edu.cn was validated on 2025-08-15
abuse-mailbox:  abuse@cernet.edu.cn
mnt-by:         APNIC-ABUSE
last-modified:  2025-08-15T09:38:28Z
source:         APNIC

role:           CERNET Helpdesk
address:        CERNET Center
address:        Beijing 100084, China
country:        CN
phone:          +86-10-6278-4049
fax-no:         +86-10-6278-5933
e-mail:         helpdesk@cernet.edu.cn
remarks:        abuse@cernet.edu.cn
admin-c:        XL1-CN
tech-c:         SZ2-AP
nic-hdl:        CER-AP
mnt-by:         MAINT-CERNET-AP
last-modified:  2020-09-03T09:14:12Z
source:         APNIC

Overlapping Ranges

BGP prefixes that contain 166.111.0.0/18

Range	ASN	Company	Num of IPs
166.111.0.0/16	AS4538	Tsinghua University	65,536

Nearby Ranges

BGP prefixes that overlap with 166.111.0.0/16

Range	ASN	Company	Num of IPs
166.111.0.0/16	AS4538	Tsinghua University	65,536

Hosted domains

There are 28 domain names hosted across 20 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
166.111.4.100	zjui.top	9
166.111.33.5	duffytec.cn	1
166.111.57.26	keepy.top	1
166.111.8.28	wonderarchitecture.com	1
166.111.5.193	youngcow.net	1
166.111.7.164	cbicr.org	1
166.111.4.39	tsinghuadigit.com	1
166.111.17.122	magicblog.site	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

Read more

Pingable IPs

1,029 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
166.111.58.72	AS4538 China Education and Research Network Center	`2.49ms` from Beijing, CN
166.111.41.150	AS4538 China Education and Research Network Center	`2.37ms` from Beijing, CN
166.111.11.1	AS4538 China Education and Research Network Center	`3.94ms` from Beijing, CN
166.111.29.129	AS4538 China Education and Research Network Center	`3.59ms` from Beijing, CN
166.111.53.207	AS4538 China Education and Research Network Center	`2.07ms` from Beijing, CN
166.111.4.5	AS4538 China Education and Research Network Center	`2.42ms` from Beijing, CN
166.111.38.107	AS4538 China Education and Research Network Center	`2.37ms` from Beijing, CN
166.111.18.45	AS4538 China Education and Research Network Center	`2.22ms` from Beijing, CN
166.111.34.223	AS4538 China Education and Research Network Center	`2.86ms` from Beijing, CN
166.111.30.5	AS4538 China Education and Research Network Center	`2.47ms` from Beijing, CN
166.111.50.77	AS4538 China Education and Research Network Center	`2.19ms` from Beijing, CN
166.111.40.129	AS4538 China Education and Research Network Center	`2.18ms` from Beijing, CN
166.111.10.1	AS4538 China Education and Research Network Center	`4.36ms` from Beijing, CN
166.111.12.65	AS4538 China Education and Research Network Center	`3.06ms` from Tianjin, CN
166.111.2.1	AS4538 China Education and Research Network Center	`3.17ms` from Beijing, CN
166.111.39.137	AS4538 China Education and Research Network Center	`2.35ms` from Beijing, CN
166.111.21.177	AS4538 China Education and Research Network Center	`2.27ms` from Beijing, CN
166.111.52.198	AS4538 China Education and Research Network Center	`2.52ms` from Beijing, CN
166.111.63.30	AS4538 China Education and Research Network Center	`2.32ms` from Beijing, CN
166.111.9.141	AS4538 China Education and Research Network Center	`3.63ms` from Beijing, CN
166.111.14.164	AS4538 China Education and Research Network Center	`3.47ms` from Beijing, CN
166.111.27.60	AS4538 China Education and Research Network Center	`2.95ms` from Beijing, CN
166.111.26.120	AS4538 China Education and Research Network Center	`2.60ms` from Beijing, CN
166.111.15.87	AS4538 China Education and Research Network Center	`2.15ms` from Beijing, CN
166.111.17.129	AS4538 China Education and Research Network Center	`2.25ms` from Beijing, 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
62.131.38.34	AS1136 KPN B.V.	`1.50ms` from Amsterdam, NL
137.83.173.2	AS22616 ZSCALER, INC.	`0.42ms` from Ashburn, US
81.70.157.162	AS45090 Shenzhen Tencent Computer Systems Company Limited	`1.93ms` from Beijing, CN
52.42.135.66	AS16509 Amazon.com, Inc.	`0.19ms` from Boardman, US
190.7.10.18	AS20207 Gigared S.A.	`18.74ms` from Buenos Aires, AR
63.180.83.34	AS16509 Amazon.com, Inc.	`0.14ms` from Frankfurt am Main, DE
223.17.152.178	AS9304 HGC Global Communications Limited	`1.52ms` from Hong Kong, HK
31.7.195.2	AS56635 XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana	`0.36ms` from Ljubljana, SI
94.175.20.146	AS5089 Virgin Media Limited	`14.67ms` from London, GB
212.78.3.2	AS8855 OPIQUAD S.P.A.	`1.64ms` from Milan, IT
115.98.234.98	AS17488 Hathway IP Over Cable Internet	`1.33ms` from Mumbai, IN
65.51.82.2	AS17076 Stone Ridge Asset Management LLC	`1.96ms` from New York City, US
68.202.208.162	AS33363 Charter Communications, Inc	`6.93ms` from Orlando, US
84.96.174.226	AS15557 Societe Francaise Du Radiotelephone - SFR SA	`4.55ms` from Paris, FR
76.115.28.146	AS7922 Comcast Cable Communications, LLC	`8.48ms` from Portland, US
180.209.64.82	AS4538 China Education and Research Network Center	`6.70ms` from Shanghai, CN
163.228.15.114	AS58593 Shanghai Blue Cloud Technology Co.,Ltd	`4.95ms` from Shanghai, CN
83.254.67.146	AS1257 Tele2 Sverige AB	`1.04ms` from Stockholm, SE
27.135.196.2	AS10013 FreeBit Co.,Ltd.	`2.50ms` from Tokyo, JP
126.121.130.18	AS17676 SoftBank Corp.	`6.45ms` from Tokyo, JP
158.101.129.82	AS31898 Oracle Corporation	`0.26ms` from Tokyo, JP
197.8.220.210	AS327934 SOCIETE NATIONALE DES TELECOMMUNICATIONS (Tunisie Telecom)	`19.71ms` from Tunis, TN
188.186.101.210	AS41682 JSC "ER-Telecom Holding"	`12.76ms` from Yekaterinburg, RU
172.173.208.242	AS8075 Microsoft Corporation	`0.37ms` from Ashburn, US
94.66.190.50	AS6799 Ote SA (Hellenic Telecommunications Organisation)	`8.23ms` from Athens, GR

Traceroute

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

traceroute -a -n -q1 -f2 166.111.61.208

traceroute to 166.111.61.208 (166.111.61.208): 64 hops max, 52 byte packets

2 [AS49770] 95.143.207.229 5.779 ms

3 *

4 *

5 *

6 *

7 [] 123.255.91.118 244.136 ms

8 [AS4538] 101.4.114.181 276.806 ms

9 *

10 *

11 [AS4538] 101.4.115.249 273.698 ms

12 *

13 [AS4538] 202.112.38.142 342.767 ms

14 [AS4538] 118.229.4.74 255.768 ms

15 *

16 [AS4538] 166.111.61.208 271.445 ms

Measurement taken from

IPinfo ProbeNet in Hudiksvall, SE

On December 15th 2025

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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