166.111.4.0/24

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:         [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

Overlapping Ranges

BGP prefixes that contain 166.111.4.0/24

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 10 domain names hosted across 2 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

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Pingable IPs

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

IP Address	ASN	Details
166.111.4.19	AS4538 China Education and Research Network Center	`2.55ms` 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
196.202.81.56	AS8452 TE-AS	`7.80ms` from Cairo, EG
187.155.179.104	AS8151 UNINET	`0.72ms` from Cancún, MX
34.143.103.40	AS396982 Google LLC	`0.22ms` from Chang-hua, TW
95.203.211.56	AS3301 Telia Company AB	`18.02ms` from Copenhagen, DK
173.217.170.200	AS19108 Optimum	`13.26ms` from Dallas, US
94.10.155.56	AS5607 Sky UK Limited	`1.49ms` from Erith, GB
91.49.60.120	AS3320 Deutsche Telekom AG	`9.00ms` from Frankfurt am Main, DE
222.76.41.216	AS4134 CHINANET-BACKBONE	`3.49ms` from Fuzhou, CN
203.198.48.136	AS4515 PCCW IMS Ltd (PCCW Business Internet Access)	`1.43ms` from Hong Kong, HK
107.189.58.136	AS393856 City of Westfield (Gas & Electric Light Department)	`7.63ms` from New York City, US
72.80.199.24	AS701 Verizon Business	`3.18ms` from New York City, US
151.45.96.88	AS1267 WIND TRE S.P.A.	`10.74ms` from Rome, IT
105.101.221.8	AS36947 Telecom Algeria	`9.39ms` from Valencia, ES
216.107.165.152	AS53610 Metro Communications Company, Inc.	`2.47ms` from Chicago, US
4.225.34.232	AS8075 Microsoft Corporation	`0.18ms` from Gaevle, SE
171.226.71.152	AS7552 Viettel Group	`15.84ms` from Ho Chi Minh City, VN
61.239.117.168	AS9269 Hong Kong Broadband Network Ltd.	`0.93ms` from Hong Kong, HK
94.97.31.168	AS25019 Saudi Telecom Company JSC	`2.30ms` from Jeddah, SA
206.116.252.216	AS852 TELUS Communications Inc.	`2.27ms` from Kelowna, CA
40.80.85.120	AS8075 Microsoft Corporation	`0.16ms` from Lohogaon, IN
83.244.248.200	AS25180 Exponential-E Ltd.	`0.41ms` from London, GB
193.152.36.24	AS3352 TELEFONICA DE ESPANA S.A.U.	`14.45ms` from Madrid, ES
23.67.64.136	AS16625 Akamai Technologies, Inc.	`0.49ms` from Miami, US
79.225.69.72	AS3320 Deutsche Telekom AG	`8.06ms` from Nuernberg, DE
175.128.7.200	AS2516 KDDI CORPORATION	`13.57ms` from Osaka, JP

Traceroute

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

traceroute -a -n -q1 -f4 166.111.4.40

traceroute to 166.111.4.40 (166.111.4.40): 64 hops max, 52 byte packets

4 [AS4538] 101.4.114.181 37.097 ms

5 *

6 *

7 [AS4538] 101.4.113.201 37.354 ms

8 [AS4538] 202.112.38.70 36.111 ms

9 [AS4538] 118.229.4.69 36.204 ms

10 [AS4538] 118.229.4.74 36.52 ms

11 *

12 [AS4538] 118.229.8.6 37.368 ms

13 *

14 [AS4538] 166.111.4.40 37.292 ms

Measurement taken from

IPinfo ProbeNet in Hong Kong, HK

On December 6th 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.

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