166.111.0.0/16

AS4538 · China Education and Research Network Center

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

Summary

Country	China
Domain	tsinghua.edu.cn
ASN	AS4538
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:         [email protected]
abuse-mailbox:  [email protected]
admin-c:        CER-AP
tech-c:         CER-AP
auth:           # Filtered
remarks:        timezone GMT+8
remarks:        http://www.ccert.edu.cn
remarks:        [email protected] 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:         [email protected]
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:         [email protected]
admin-c:        CER-AP
tech-c:         CER-AP
nic-hdl:        AC1685-AP
remarks:        Generated from irt object IRT-CERNET-AP
remarks:        [email protected] was validated on 2025-08-15
abuse-mailbox:  [email protected]
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:         [email protected]
remarks:        [email protected]
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

Nearby Ranges

BGP prefixes that overlap with 166.0.0.0/8

Range	ASN	Company	Num of IPs
166.72.0.0/16	AS7018	AT&T Enterprises, LLC	65,536
166.102.0.0/16	AS7029	Windstream Communications LLC	65,536
166.92.0.0/16	AS16509	Amazon.com, Inc.	65,536
166.100.0.0/16	AS2687	AT&T Japan K.K.	65,536
166.91.0.0/16	AS14072	District of Columbia Public Schools	65,536
166.117.0.0/16	AS16509	Amazon.com, Inc.	65,536
166.82.0.0/16	AS7029	Windstream Communications LLC	65,536
166.84.0.0/16	AS2033	Panix	65,536
166.104.0.0/16	AS9321	Hanyang University	65,536
166.56.0.0/16	AS3372	Verizon Business	65,536
166.80.0.0/16	AS16509	Amazon.com, Inc.	65,536
166.74.0.0/16	AS16509	Amazon.com, Inc.	65,536
166.56.0.0/16	AS3371	Verizon Business	65,536
166.90.0.0/16	AS3356	Level 3 Parent, LLC	65,536
166.238.0.0/16	AS26611	COMUNICACIÓN CELULAR S.A. COMCEL S.A.	65,536
166.90.0.0/16	AS3257	Level 3 Parent, LLC	65,536
166.70.0.0/16	AS6315	XMission, L.C.	65,536
166.20.0.0/16	AS243	L3Harris Technologies, Inc.	65,536
166.58.0.0/16	AS3372	Verizon Business	65,536
166.93.0.0/16	AS26914	Synoptek, LLC	65,536
166.19.0.0/16	AS33425	CoreWeave, Inc	65,536
166.58.0.0/16	AS3371	Verizon Business	65,536
166.91.0.0/16	AS33084	District of Columbia Public Schools	65,536
166.69.0.0/16	AS19773	Motorola MNIC	65,536
166.99.0.0/16	AS11719	Eaton Corporation	65,536
166.211.0.0/16	AS22394	Verizon Business	65,536
166.89.0.0/16	AS13918	City of Tucson	65,536
166.123.0.0/16	AS13506	United States Department of the Treasury	65,536
166.211.0.0/16	AS6167	Verizon Business	65,536
166.122.0.0/16	AS6360	University of Hawaii	65,536
166.94.0.0/16	AS3926	Fairfax County Government	65,536
166.58.0.0/16	AS3377	Verizon Business	65,536
166.87.0.0/16	AS5080	Saudi Arabian Oil Company	65,536
166.49.128.0/17	AS5400	communications networking services Private Unlimited Company	32,768
166.48.0.0/17	AS396338	Altima Telecom	32,768
166.62.128.0/17	AS5769	Videotron Ltee	32,768
166.114.128.0/17	AS6568	EMPRESA NACIONAL DE TELECOMUNICACIONES SOCIEDAD ANONIMA	32,768
166.49.0.0/17	AS3561	CenturyLink Communications, LLC	32,768
166.114.64.0/18	AS6568	EMPRESA NACIONAL DE TELECOMUNICACIONES SOCIEDAD ANONIMA	16,384
166.113.64.0/18	AS53449	OEC Fiber	16,384
166.108.128.0/18	AS35077	Netwo SAS	16,384
166.63.160.0/19	AS1273	Vodafone Americas	8,192
166.114.32.0/19	AS6568	EMPRESA NACIONAL DE TELECOMUNICACIONES SOCIEDAD ANONIMA	8,192
166.63.128.0/19	AS3561	CenturyLink Communications, LLC	8,192
166.113.0.0/19	AS19870	Cherry Creek School District #5	8,192
166.113.32.0/19	AS13370	Ziply Fiber	8,192
166.63.192.0/19	AS1273	Vodafone Americas	8,192
166.108.0.0/19	AS16509	Amazon.com, Inc.	8,192
166.114.16.0/20	AS6568	EMPRESA NACIONAL DE TELECOMUNICACIONES SOCIEDAD ANONIMA	4,096

Hosted domains

There are 91 domain names hosted across 68 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP

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

3,104 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
166.111.236.22	AS4538 China Education and Research Network Center	`2.18ms` from Beijing, CN
166.111.244.223	AS4538 China Education and Research Network Center	`3.44ms` from Beijing, CN
166.111.2.33	AS4538 China Education and Research Network Center	`3.93ms` from Beijing, CN
166.111.60.20	AS4538 China Education and Research Network Center	`2.35ms` from Beijing, CN
166.111.210.1	AS4538 China Education and Research Network Center	`3.85ms` from Beijing, CN
166.111.218.1	AS4538 China Education and Research Network Center	`3.27ms` from Beijing, CN
166.111.143.1	AS4538 China Education and Research Network Center	`3.44ms` from Beijing, CN
166.111.116.225	AS4538 China Education and Research Network Center	`3.38ms` from Beijing, CN
166.111.32.245	AS4538 China Education and Research Network Center	`2.41ms` from Beijing, CN
166.111.84.1	AS4538 China Education and Research Network Center	`4.93ms` from Beijing, CN
166.111.145.21	AS4538 China Education and Research Network Center	`3.45ms` from Beijing, CN
166.111.212.33	AS4538 China Education and Research Network Center	`3.35ms` from Beijing, CN
166.111.76.74	AS4538 China Education and Research Network Center	`3.33ms` from Beijing, CN
166.111.154.66	AS4538 China Education and Research Network Center	`2.50ms` from Beijing, CN
166.111.153.24	AS4538 China Education and Research Network Center	`2.58ms` from Beijing, CN
166.111.146.231	AS4538 China Education and Research Network Center	`3.35ms` from Beijing, CN
166.111.77.76	AS4538 China Education and Research Network Center	`3.07ms` from Tianjin, CN
166.111.36.92	AS4538 China Education and Research Network Center	`2.38ms` from Beijing, CN
166.111.89.74	AS4538 China Education and Research Network Center	`2.37ms` from Beijing, CN
166.111.25.5	AS4538 China Education and Research Network Center	`3.59ms` from Beijing, CN
166.111.109.20	AS4538 China Education and Research Network Center	`3.55ms` from Beijing, CN
166.111.144.1	AS4538 China Education and Research Network Center	`3.98ms` from Beijing, CN
166.111.180.54	AS4538 China Education and Research Network Center	`2.33ms` from Beijing, CN
166.111.6.99	AS4538 China Education and Research Network Center	`3.31ms` from Beijing, CN
166.111.50.97	AS4538 China Education and Research Network Center	`3.06ms` from Tianjin, 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
54.184.15.240	AS16509 Amazon.com, Inc.	`0.17ms` from Boardman, US
38.130.72.48	AS174 Cogent Communications, LLC	`1.31ms` from Chicago, US
76.134.86.112	AS7922 Comcast Cable Communications, LLC	`10.15ms` from Dallas, US
54.246.198.160	AS16509 Amazon.com, Inc.	`0.18ms` from Dublin, IE
93.207.177.16	AS3320 Deutsche Telekom AG	`3.89ms` from Hamburg, DE
178.17.53.240	AS215540 GLOBAL CONNECTIVITY SOLUTIONS LLP	`0.25ms` from Helsinki, FI
112.144.105.112	AS17858 LG POWERCOMM	`2.07ms` from Incheon, KR
1.250.82.160	AS9318 SK Broadband Co Ltd	`4.91ms` from Incheon, KR
74.50.240.144	AS35894 Northern Arkansas Telephone Company	`10.70ms` from Kansas City, US
209.45.98.16	AS3132 Red Cientifica Peruana	`0.29ms` from Lima, PE
191.54.98.80	AS53006 ALGAR TELECOM S/A	`1.35ms` from Osasco, BR
20.236.45.32	AS8075 Microsoft Corporation	`0.18ms` from Quincy, US
187.207.183.176	AS8151 UNINET	`11.41ms` from Santiago de Queretaro, MX
182.230.22.144	AS17858 LG POWERCOMM	`2.11ms` from Seoul, KR
46.246.228.208	AS1241 Forthnet	`2.13ms` from Athens, GR
141.135.29.128	AS6848 Telenet BV	`4.92ms` from Brussels, BE
141.83.99.80	AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V.	`1.93ms` from Hamburg, DE
2.135.2.64	AS9198 JSC Kazakhtelecom	`7.69ms` from Karagandy, KZ
92.237.181.128	AS5089 Virgin Media Limited	`5.52ms` from London, GB
86.207.218.32	AS3215 Orange S.A.	`4.60ms` from Lyon, FR
84.232.85.112	AS29119 AIRE NETWORKS DEL MEDITERRANEO SL UNIPERSONAL	`5.94ms` from Madrid, ES
70.126.37.240	AS33363 Charter Communications, Inc	`9.13ms` from Orlando, US
88.191.78.16	AS12322 Free SAS	`13.65ms` from Paris, FR
185.127.95.16	AS3170 VeloxServ Communications Ltd	`0.21ms` from Redditch, GB
98.80.87.48	AS14618 Amazon.com, Inc.	`0.22ms` from Reston, US

Traceroute

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

traceroute -a -n -q1 -f6 166.111.3.65

traceroute to 166.111.3.65 (166.111.3.65): 64 hops max, 52 byte packets

6 [AS4538] 101.4.130.101 3.674 ms

7 *

8 *

9 [AS4538] 202.112.38.142 3.497 ms

10 [AS4538] 118.229.4.74 4.16 ms

11 [AS4538] 166.111.3.65 4.55 ms

Measurement taken from

IPinfo ProbeNet in Beijing, CN

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.

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.

Get Started for Free Contact Sales