202.121.252.0/22

AS4538 · China Education and Research Network Center

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Summary

Country	China
Domain	cernet.edu.cn
ASN	AS4538
Registry	APNIC
ID	CERNET-CN

WHOIS Details

inetnum:        202.112.0.0 - 202.121.255.255
netname:        CERNET-CN
descr:          China Education and Research Network
descr:          China Education and Research Network Center
descr:          Tsinghua University
descr:          Beijing, 100084
country:        CN
admin-c:        CER-AP
tech-c:         CER-AP
abuse-c:        AC1685-AP
status:         ALLOCATED PORTABLE
remarks:        origin AS4538
mnt-by:         APNIC-HM
mnt-lower:      MAINT-CERNET-AP
mnt-routes:     MAINT-CERNET-AP
mnt-irt:        IRT-CERNET-AP
last-modified:  2020-09-03T09:16:29Z
source:         APNIC

irt:            IRT-CERNET-AP
address:        Network Center,
address:        FIT-3-220, 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:        abuse@cernet.edu.cn was validated on 2026-03-05
mnt-by:         MAINT-CERNET-AP
last-modified:  2026-03-05T06:39:56Z
source:         APNIC

role:           ABUSE CERNETAP
country:        ZZ
address:        Network Center,
address:        FIT-3-220, 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 2026-03-05
abuse-mailbox:  abuse@cernet.edu.cn
mnt-by:         APNIC-ABUSE
last-modified:  2026-03-05T06:40:20Z
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

Nearby Ranges

BGP prefixes that overlap with 202.121.0.0/16

No nearby ranges found.

Hosted domains

There are 2 domain names hosted across 1 IP address 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

No IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

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
20.16.74.182	AS8075 Microsoft Corporation	`0.15ms` from Amsterdam, NL
69.73.117.38	AS12083 WideOpenWest Finance LLC	`2.81ms` from Atlanta, US
4.152.201.230	AS8075 Microsoft Corporation	`0.25ms` from Boydton, US
195.243.193.246	AS3320 Deutsche Telekom AG	`1.14ms` from Frankfurt am Main, DE
171.229.40.102	AS7552 Viettel Group	`7.82ms` from Hanoi, VN
92.239.97.214	AS5089 Virgin Media Limited	`4.75ms` from London, GB
158.143.79.22	AS786 Jisc Services Limited	`1.07ms` from London, GB
2.102.89.134	AS13285 TalkTalk Communications Limited	`2.82ms` from Manchester, GB
162.196.31.38	AS7018 AT&T Enterprises, LLC	`6.94ms` from Miami, US
77.79.191.150	AS24955 JSC Ufanet	`17.49ms` from Moscow, RU
74.95.8.70	AS7922 Comcast Cable Communications, LLC	`5.88ms` from San Jose, US
20.76.144.102	AS8075 Microsoft Corporation	`0.22ms` from Amsterdam, NL
3.103.117.214	AS16509 Amazon.com, Inc.	`0.96ms` from Auckland, NZ
75.161.37.54	AS209 CenturyLink Communications, LLC	`10.17ms` from Denver, US
113.160.3.86	AS45899 VNPT Corp	`0.70ms` from Hanoi, VN
82.126.88.246	AS3215 Orange S.A.	`5.88ms` from Lyon, FR
104.15.111.102	AS7018 AT&T Enterprises, LLC	`2.73ms` from Miami, US
72.208.199.38	AS22773 Cox Communications Inc.	`5.54ms` from Phoenix, US
163.211.225.118	AS17512 Japan Airlines Co.,Ltd.	`1.38ms` from Tokyo, JP
81.206.184.6	AS1136 KPN B.V.	`1.25ms` from Amsterdam, NL
198.110.212.22	AS237 Merit Network Inc.	`12.29ms` from Chicago, US
23.64.6.214	AS16625 Akamai Technologies, Inc.	`0.48ms` from Dallas, US
91.52.185.134	AS3320 Deutsche Telekom AG	`2.43ms` from Duesseldorf, DE
60.216.90.246	AS4837 CHINA UNICOM China169 Backbone	`1.42ms` from Jinan, CN
81.36.188.102	AS3352 TELEFONICA DE ESPANA S.A.U.	`7.09ms` from Madrid, ES

Traceroute

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

traceroute -a -n -q1 -f6 -m10 202.121.255.208

traceroute to 202.121.255.208 (202.121.255.208): 10 hops max, 52 byte packets

6 [] 123.255.91.118 3.139 ms

7 [AS4538] 101.4.114.181 37.625 ms

8 *

9 *

10 *

Measurement taken from

IPinfo ProbeNet in Hong Kong, HK

On April 13th 2026

What are IP address ranges?

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