121.195.186.0/24

AS4538 · China Education and Research Network Center

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Summary

Country	China
Domain	cernet.edu.cn
ASN	AS4538
Parent Range	121.194.0.0/15
Registry	APNIC
ID	BJR-CERNET

WHOIS Details

inetnum:        121.194.0.0 - 121.195.255.255
netname:        BJR-CERNET
descr:          China Education and Research Network
descr:          Beijing 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:  2020-09-03T09:16:22Z
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:         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:        http://www.ccert.edu.cn
remarks:        abuse@cernet.edu.cn 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:         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 2025-08-15
abuse-mailbox:  abuse@cernet.edu.cn
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:         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:          121.194.0.0/16
descr:          CERNET
origin:         AS4538
mnt-by:         MAINT-CERNET-AP
last-modified:  2009-01-05T03:10:57Z
source:         APNIC

Overlapping Ranges

BGP prefixes that contain 121.195.186.0/24

Range	ASN	Company	Num of IPs
121.194.0.0/15	AS4538	China Education and Research Network	131,072

Nearby Ranges

BGP prefixes that overlap with 121.195.0.0/16

Range	ASN	Company	Num of IPs
121.194.0.0/15	AS4538	China Education and Research Network	131,072

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

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
121.195.186.253	AS4538 China Education and Research Network Center	`1.59ms` 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
3.28.170.120	AS16509 Amazon.com, Inc.	`0.12ms` from Dubai, AE
220.172.158.136	AS4134 CHINANET-BACKBONE	`4.83ms` from Guiyang, CN
46.201.139.40	AS6849 JSC "Ukrtelecom"	`4.61ms` from Kyiv, UA
83.106.95.232	AS5378 Vodafone Limited	`6.89ms` from London, GB
180.220.169.232	AS9617 JCOM Co., Ltd.	`11.40ms` from Osaka, JP
100.14.199.248	AS701 Verizon Business	`1.18ms` from Philadelphia, US
216.92.126.72	AS7859 pair Networks	`0.10ms` from Pittsburgh, US
191.186.87.72	AS28573 Claro NXT Telecomunicacoes Ltda	`8.41ms` from Sao Paulo, BR
99.245.193.184	AS812 Rogers Communications Canada Inc.	`4.31ms` from Toronto, CA
146.12.157.136	AS397976 Central Access, Inc.	`5.20ms` from Atlanta, US
35.164.116.136	AS16509 Amazon.com, Inc.	`0.16ms` from Boardman, US
81.182.32.56	AS5483 Magyar Telekom Plc.	`6.24ms` from Budapest, HU
85.242.28.56	AS3243 MEO - SERVICOS DE COMUNICACOES E MULTIMEDIA S.A.	`4.75ms` from Lisbon, PT
109.170.205.152	AS5413 Wavenet Limited	`3.29ms` from London, GB
90.116.72.248	AS3215 Orange S.A.	`6.09ms` from Marseille, FR
176.190.72.8	AS5410 Bouygues Telecom SA	`11.09ms` from Marseille, FR
101.173.170.232	AS1221 Telstra Limited	`2.65ms` from Melbourne, AU
52.158.157.184	AS8075 Microsoft Corporation	`0.62ms` from Melbourne, AU
208.68.167.168	AS14935 Monticello Networks, Inc.	`0.16ms` from Monticello, US
131.106.71.8	AS6079 RCN	`8.67ms` from Newark, US
39.83.192.232	AS4837 CHINA UNICOM China169 Backbone	`7.07ms` from Qingdao, CN
52.249.25.200	AS8075 Microsoft Corporation	`0.25ms` from San Antonio, US
66.122.33.200	AS7018 AT&T Enterprises, LLC	`2.64ms` from San Jose, US
218.149.87.72	AS4766 Korea Telecom	`5.09ms` from Seoul, KR
119.82.147.8	AS38220 Amaze Intelligence	`0.44ms` from Sydney, AU

Traceroute

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

traceroute -a -n -q1 -f3 121.195.186.255

traceroute to 121.195.186.255 (121.195.186.255): 64 hops max, 52 byte packets

3 [AS749] 11.254.129.97 1.358 ms

4 [AS749] 11.62.83.177 1.772 ms

5 *

6 [AS141679] 106.63.0.169 1.38 ms

7 [AS141679] 106.63.121.113 0.693 ms

8 *

9 *

10 *

11 *

12 [AS4538] 121.195.186.255 3.734 ms

Measurement taken from

IPinfo ProbeNet in Tianjin, CN

On November 15th 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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