121.251.48.0/23

AS4538 · China Education and Research Network Center

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Summary

Country	China
Domain	cernet.edu.cn
ASN	AS4538
Parent Range	121.248.0.0/14
Registry	APNIC
ID	NJR-CERNET

WHOIS Details

inetnum:        121.248.0.0 - 121.251.255.255
netname:        NJR-CERNET
descr:          China Education and Research Network
descr:          Nanjing Regional Network
country:        CN
admin-c:        CER-AP
tech-c:         CER-AP
abuse-c:        AC1685-AP
status:         ALLOCATED PORTABLE
remarks:        origin AS4538
remarks:        confederation
remarks:        --------------------------------------------------------
remarks:        To report network abuse, please contact mnt-irt
remarks:        For troubleshooting, please contact tech-c and admin-c
remarks:        Report invalid contact via www.apnic.net/invalidcontact
remarks:        --------------------------------------------------------
mnt-by:         APNIC-HM
mnt-lower:      MAINT-CERNET-AP
mnt-routes:     MAINT-CERNET-AP
mnt-irt:        IRT-CERNET-AP
last-modified:  2020-09-03T09:15:58Z
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:          121.248.0.0/15
descr:          CERNET
origin:         AS4538
mnt-by:         MAINT-CERNET-AP
last-modified:  2009-01-05T03:10:57Z
source:         APNIC

Overlapping Ranges

BGP prefixes that contain 121.251.48.0/23

Range	ASN	Company	Num of IPs
121.248.0.0/14	AS4538	China Education and Research Network	262,144

Nearby Ranges

BGP prefixes that overlap with 121.251.0.0/16

Range	ASN	Company	Num of IPs
121.248.0.0/14	AS4538	China Education and Research Network	262,144

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

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

IP Address	ASN	Details
121.251.49.248	AS4538 China Education and Research Network Center	`14.53ms` 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
1.121.226.55	AS1221 Telstra Limited	`4.69ms` from Adelaide, AU
181.92.76.119	AS7303 Telecom Argentina S.A.	`1.66ms` from Buenos Aires, AR
88.231.238.231	AS9121 Turk Telekomunikasyon Anonim Sirketi	`7.54ms` from Bursa, TR
119.54.28.167	AS4837 CHINA UNICOM China169 Backbone	`2.60ms` from Changchun, CN
216.64.203.55	AS3561 CenturyLink Communications, LLC	`2.76ms` from Chicago, US
194.68.229.7	AS50572 Nordlo Improve AB	`3.79ms` from Falkenberg, SE
24.71.34.39	AS6327 Shaw Communications	`7.98ms` from Kelowna, CA
13.40.155.55	AS16509 Amazon.com, Inc.	`0.49ms` from London, GB
90.199.132.87	AS5607 Sky UK Limited	`4.71ms` from London, GB
172.248.3.135	AS20001 Charter Communications Inc	`3.98ms` from Los Angeles, US
95.72.198.183	AS12389 PJSC Rostelecom	`4.03ms` from Moscow, RU
98.58.221.151	AS7922 Comcast Cable Communications, LLC	`9.79ms` from Pompano Beach, US
114.172.235.7	AS4713 NTT DOCOMO BUSINESS,Inc.	`5.63ms` from Tokyo, JP
24.150.161.183	AS7992 Cogeco Connexion Inc.	`5.04ms` from Toronto, CA
102.26.253.247	AS327934 SOCIETE NATIONALE DES TELECOMMUNICATIONS (Tunisie Telecom)	`11.43ms` from Tunis, TN
188.128.155.87	AS12824 home.pl sp. z o.o.	`0.86ms` from Warsaw, PL
76.151.2.119	AS7922 Comcast Cable Communications, LLC	`8.34ms` from Ashburn, US
23.253.228.39	AS33070 Rackspace Hosting	`0.88ms` from Dallas, US
63.34.86.135	AS16509 Amazon.com, Inc.	`0.18ms` from Dublin, IE
54.154.167.23	AS16509 Amazon.com, Inc.	`0.17ms` from Dublin, IE
86.157.176.199	AS2856 British Telecommunications PLC	`11.58ms` from Erith, GB
84.145.141.23	AS3320 Deutsche Telekom AG	`8.98ms` from Frankfurt am Main, DE
68.235.13.7	AS19107 Ymax Communications Corp	`1.49ms` from Nashville, US
20.251.4.103	AS8075 Microsoft Corporation	`0.53ms` from Oslo, NO
54.169.77.23	AS16509 Amazon.com, Inc.	`0.13ms` from Singapore, SG

Traceroute

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

traceroute -a -n -q1 -f2 -m20 121.251.48.121

traceroute to 121.251.48.121 (121.251.48.121): 20 hops max, 52 byte packets

2 [AS49770] 95.143.207.229 102.414 ms

3 *

4 *

5 *

6 *

7 [] 123.255.91.118 271.164 ms

8 [AS4538] 101.4.114.181 238.325 ms

9 *

10 *

11 [AS4538] 101.4.112.66 259.149 ms

12 *

13 *

14 *

15 [AS4538] 101.4.115.186 337.901 ms

16 [AS4538] 101.4.115.14 259.775 ms

17 [AS4538] 210.45.229.19 264.066 ms

18 *

19 *

20 *

Measurement taken from

IPinfo ProbeNet in Hudiksvall, SE

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.

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