121.195.16.0/20

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 121.195.16.0/20

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

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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
192.29.198.68	AS31898 Oracle Corporation	`0.15ms` from Amsterdam, NL
73.7.83.4	AS7922 Comcast Cable Communications, LLC	`4.82ms` from Atlanta, US
189.233.246.84	AS8151 UNINET	`11.65ms` from Cancún, MX
40.0.31.196	AS4249 Eli Lilly and Company	`7.20ms` from Chicago, US
104.154.170.244	AS396982 Google LLC	`0.12ms` from Council Bluffs, US
121.199.203.4	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`2.05ms` from Hangzhou, CN
121.229.101.36	AS134756 CHINANET Nanjing Jishan IDC network	`3.61ms` from Huai'an, CN
41.84.62.20	AS37179 Africa Independent Network Exchange (Pty) LTD (AfricaINX)	`0.27ms` from Johannesburg, ZA
106.201.152.228	AS24560 Bharti Airtel Ltd., Telemedia Services	`14.96ms` from Kolkata, IN
131.154.152.20	AS137 Consortium GARR	`6.40ms` from Milan, IT
20.188.45.164	AS8075 Microsoft Corporation	`0.20ms` from Paris, FR
66.98.31.52	AS6400 Compañía Dominicana de Teléfonos S. A.	`6.06ms` from Santo Domingo, DO
49.172.160.36	AS17858 LG POWERCOMM	`2.24ms` from Seoul, KR
121.2.88.36	AS2527 Sony Network Communications Inc.	`2.37ms` from Tokyo, JP
104.21.117.100	AS13335 Cloudflare, Inc.	`0.13ms` from Yerevan, AM
80.95.170.52	AS24586 Intermax Group B.V.	`1.75ms` from Amsterdam, NL
98.239.25.100	AS7922 Comcast Cable Communications, LLC	`19.77ms` from Atlanta, US
111.13.14.244	AS9808 China Mobile Communications Group Co., Ltd.	`2.21ms` from Beijing, CN
93.226.252.36	AS3320 Deutsche Telekom AG	`5.78ms` from Berlin, DE
16.146.90.20	AS16509 Amazon.com, Inc.	`0.54ms` from Boardman, US
41.129.104.148	AS24863 Link Egypt (Link.NET)	`11.50ms` from Cairo, EG
103.115.105.4	AS137602 Comviva Technologies Limited	`2.92ms` from Delhi, IN
188.132.232.20	AS197450 SUNUCUN BILGI ILETISIM TEKNOLOJILERI VE TICARET LIMITED SIRKETI	`0.69ms` from Istanbul, TR
154.205.236.212	AS44559 IT HOSTLINE LTD	`0.23ms` from Istanbul, TR
31.29.127.20	AS197618 SDNum SAS	`10.44ms` from Paris, FR

Traceroute

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

traceroute -a -n -q1 -m13 121.195.20.164

traceroute to 121.195.20.164 (121.195.20.164): 13 hops max, 52 byte packets

1 [AS4134] 222.184.35.1 9.302 ms

2 *

3 *

4 [AS4134] 222.184.63.53 3.332 ms

5 *

6 *

7 *

8 *

9 [AS4538] 101.4.118.25 39.038 ms

10 [AS4538] 101.4.116.90 41.191 ms

11 *

12 *

13 *

Measurement taken from

IPinfo ProbeNet in Huai'an, CN

On November 14th 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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