202.121.192.0/20

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 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

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 202.121.0.0/16

No nearby ranges found.

Hosted domains

There are no domains currently hosted on this ASN.

Hosted domains API

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Useful for Cybersecurity

Read more

Pingable IPs

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

IP Address	ASN	Details
202.121.199.240	AS4538 China Education and Research Network Center	`2.61ms` 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
47.253.66.4	AS45102 Alibaba (US) Technology Co., Ltd.	`0.84ms` from Ashburn, US
105.68.166.36	AS36884 Wana Corporate	`4.02ms` from Casablanca, MA
82.116.128.4	AS43937 Playtech Estonia OU	`0.41ms` from Dublin, IE
104.220.110.116	AS11404 Wave Broadband	`8.27ms` from Fremont, US
89.151.150.100	AS12389 PJSC Rostelecom	`10.32ms` from Kazan, RU
172.87.210.116	AS26658 HT	`0.27ms` from Los Angeles, US
37.41.244.228	AS28885 OmanTel NAP	`3.15ms` from Muscat, OM
204.183.84.4	AS6372 DCANet	`3.68ms` from Philadelphia, US
182.32.63.68	AS4134 CHINANET-BACKBONE	`7.16ms` from Qingdao, CN
23.53.223.196	AS20940 Akamai International B.V.	`0.53ms` from San Jose, US
212.125.214.84	AS25400 Telia Norge AS	`8.74ms` from Sandefjord, NO
187.21.199.68	AS28573 Claro NXT Telecomunicacoes Ltda	`1.96ms` from Sao Paulo, BR
13.212.36.4	AS16509 Amazon.com, Inc.	`0.53ms` from Singapore, SG
175.147.78.100	AS4837 CHINA UNICOM China169 Backbone	`7.96ms` from Tieling, CN
117.131.145.52	AS38019 tianjin Mobile Communication Company Limited	`6.37ms` from Beijing, CN
64.17.120.4	AS5738 FirstLight Fiber, Inc.	`5.73ms` from Boston, US
175.17.155.68	AS4837 CHINA UNICOM China169 Backbone	`3.01ms` from Changchun, CN
23.102.23.132	AS8075 Microsoft Corporation	`0.16ms` from Dublin, IE
211.40.88.116	AS3786 LG DACOM Corporation	`1.61ms` from Incheon, KR
95.37.24.164	AS12389 PJSC Rostelecom	`6.62ms` from Kazan, RU
31.49.6.164	AS2856 British Telecommunications PLC	`4.35ms` from London, GB
23.105.193.4	AS25820 IT7 Networks Inc	`0.26ms` from Los Angeles, US
217.141.196.36	AS3269 Telecom Italia S.p.A.	`4.69ms` from Milan, IT
8.133.127.132	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`4.76ms` from Shanghai, CN
36.228.252.164	AS3462 Data Communication Business Group	`1.84ms` from Taipei, TW

Traceroute

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

traceroute -a -n -q1 -f5 -m13 202.121.202.154

traceroute to 202.121.202.154 (202.121.202.154): 13 hops max, 52 byte packets

5 [] 123.255.91.118 82.885 ms

6 [AS4538] 101.4.114.181 116.551 ms

7 *

8 *

9 *

10 [AS4538] 101.4.115.202 140.416 ms

11 *

12 *

13 *

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On January 18th 2026

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