121.192.16.0/21

AS4538 · China Education and Research Network Center

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Summary

Country	China
Domain	cernet.edu.cn
ASN	AS4538
Parent Range	121.192.0.0/16
Registry	APNIC
ID	SHR-CERNET

WHOIS Details

inetnum:        121.192.0.0 - 121.192.255.255
netname:        SHR-CERNET
descr:          China Education and Research Network
descr:          Shanghai Regional Network
country:        CN
admin-c:        CER-AP
tech-c:         CER-AP
abuse-c:        AC1685-AP
status:         ALLOCATED PORTABLE
remarks:        origin AS4538
remarks:        confederation
mnt-by:         APNIC-HM
mnt-lower:      MAINT-CERNET-AP
mnt-routes:     MAINT-CERNET-AP
mnt-irt:        IRT-CERNET-AP
last-modified:  2020-09-03T09:16:25Z
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

route:          121.192.0.0/16
descr:          CERNET
origin:         AS4538
mnt-by:         MAINT-CERNET-AP
last-modified:  2009-01-05T03:10:57Z
source:         APNIC

Overlapping Ranges

BGP prefixes that contain 121.192.16.0/21

Range	ASN	Company	Num of IPs
121.192.0.0/16	AS4538	China Education and Research Network	65,536

Nearby Ranges

BGP prefixes that overlap with 121.192.0.0/16

Range	ASN	Company	Num of IPs
121.192.0.0/16	AS4538	China Education and Research Network	65,536

Hosted domains

There are no domains currently hosted on this ASN.

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

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

IP Address	ASN	Details
121.192.20.143	AS4538 China Education and Research Network Center	`7.39ms` from Hangzhou, CN
121.192.18.25	AS4538 China Education and Research Network Center	`7.03ms` from Hangzhou, 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
51.163.38.53	AS15830 Equinix (EMEA) Acquisition Enterprises B.V.	`0.53ms` from Amsterdam, NL
4.79.171.181	AS3356 Level 3 Parent, LLC	`0.55ms` from Ashburn, US
73.199.6.197	AS7922 Comcast Cable Communications, LLC	`8.21ms` from Ashburn, US
99.89.129.53	AS7018 AT&T Enterprises, LLC	`15.11ms` from Chicago, US
129.79.46.181	AS87 Indiana University	`5.81ms` from Chicago, US
167.224.175.229	AS395662 OzarksGo, LLC	`9.69ms` from Dallas, US
99.6.244.101	AS7018 AT&T Enterprises, LLC	`3.72ms` from Dallas, US
113.168.135.149	AS45899 VNPT Corp	`3.58ms` from Hanoi, VN
23.235.129.213	AS132839 POWER LINE DATACENTER	`1.04ms` from Hong Kong, HK
202.93.30.5	AS23952 Thamrin Telekomunikasi Network PT.	`1.68ms` from Jakarta, ID
109.182.140.229	AS5603 Telekom Slovenije, d.d.	`2.22ms` from Ljubljana, SI
88.2.250.85	AS3352 TELEFONICA DE ESPANA S.A.U.	`10.16ms` from Madrid, ES
147.253.151.149	AS5769 Videotron Ltee	`3.96ms` from Montreal, CA
207.134.135.69	AS852 TELUS Communications Inc.	`4.24ms` from Montreal, CA
118.212.58.197	AS4837 CHINA UNICOM China169 Backbone	`4.77ms` from Nanchang, CN
135.234.119.117	AS8075 Microsoft Corporation	`0.40ms` from Phoenix, US
151.84.138.197	AS1267 WIND TRE S.P.A.	`3.33ms` from Rome, IT
101.88.172.149	AS4812 China Telecom (Group)	`2.05ms` from Shanghai, CN
54.254.212.85	AS16509 Amazon.com, Inc.	`0.12ms` from Singapore, SG
36.231.162.101	AS3462 Data Communication Business Group	`1.27ms` from Taipei, TW
54.178.98.5	AS16509 Amazon.com, Inc.	`0.22ms` from Tokyo, JP
202.247.59.37	AS2518 BIGLOBE Inc.	`4.76ms` from Tokyo, JP
158.129.62.21	AS2847 Kauno Technologijos Universitetas	`1.89ms` from Vilnius, LT
107.12.201.165	AS11426 Charter Communications Inc	`16.07ms` from Ashburn, US
73.126.22.229	AS7922 Comcast Cable Communications, LLC	`7.66ms` from Boston, 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 121.192.20.231

traceroute to 121.192.20.231 (121.192.20.231): 64 hops max, 52 byte packets

6 [AS4538] 101.4.131.17 10.328 ms

7 [AS4538] 219.224.102.217 6.871 ms

8 *

9 *

10 *

11 [AS4538] 210.32.123.226 9.664 ms

12 *

13 [AS4538] 210.33.27.10 15.757 ms

14 [AS4538] 121.192.20.231 7.588 ms

Measurement taken from

IPinfo ProbeNet in Hangzhou, CN

On March 21st 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.

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