121.251.26.0/23

AS4538  ·  China Education and Research Network Center

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Summary

Country China
Domain cernet.edu.cn
ASN AS4538
Parent Range 121.250.0.0/15
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 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 2025-01-22
mnt-by:         MAINT-CERNET-AP
last-modified:  2025-01-22T13:47:43Z
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 2025-01-22
abuse-mailbox:  abuse@cernet.edu.cn
mnt-by:         APNIC-ABUSE
last-modified:  2025-01-22T16:25:45Z
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 121.251.26.0/23

Range ASN Company Num of IPs
121.250.0.0/15 AS4538 China Education and Research Network 131,072
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
121.250.0.0/15 AS4538 China Education and Research Network 131,072
121.251.0.0/20 AS24362 China Education and Research Network 4,096
121.251.192.0/20 AS24363 China Education and Research Network 4,096
121.251.0.0/20 AS4538 China Education and Research Network 4,096
121.251.176.0/20 AS24363 China Education and Research Network 4,096
121.251.176.0/20 AS4538 China Education and Research Network 4,096
121.251.160.0/20 AS4538 China Education and Research Network 4,096
121.251.160.0/20 AS24363 China Education and Research Network 4,096
121.251.64.0/20 AS24362 China Education and Research Network 4,096
121.251.64.0/20 AS4538 China Education and Research Network 4,096
121.251.240.0/20 AS132553 China Education and Research Network 4,096
121.251.240.0/20 AS4538 China Education and Research Network 4,096
121.251.144.0/20 AS4538 China Education and Research Network 4,096
121.251.144.0/20 AS24363 China Education and Research Network 4,096
121.251.224.0/20 AS4538 China Education and Research Network 4,096
121.251.224.0/20 AS138371 China Education and Research Network 4,096
121.251.192.0/20 AS4538 China Education and Research Network 4,096
121.251.16.0/21 AS24362 China Education and Research Network 2,048
121.251.88.0/21 AS4538 China Education and Research Network 2,048
121.251.88.0/21 AS24362 China Education and Research Network 2,048
121.251.208.0/21 AS4538 China Education and Research Network 2,048
121.251.208.0/21 AS138371 China Education and Research Network 2,048
121.251.16.0/21 AS4538 China Education and Research Network 2,048
121.251.216.0/21 AS138371 China Education and Research Network 2,048
121.251.216.0/21 AS4538 China Education and Research Network 2,048
121.251.136.0/21 AS138371 China Education and Research Network 2,048
121.251.136.0/21 AS4538 China Education and Research Network 2,048
121.251.128.0/22 AS4538 China Education and Research Network 1,024
121.251.132.0/22 AS24363 China Education and Research Network 1,024
121.251.132.0/22 AS4538 China Education and Research Network 1,024
121.251.128.0/22 AS24363 China Education and Research Network 1,024
121.251.32.0/22 AS4538 China Education and Research Network 1,024
121.251.32.0/22 AS24362 China Education and Research Network 1,024
121.251.24.0/23 AS4538 China Education and Research Network 512
121.251.50.0/23 AS4538 China Education and Research Network 512
121.251.28.0/23 AS24362 China Education and Research Network 512
121.251.48.0/23 AS24362 China Education and Research Network 512
121.251.48.0/23 AS4538 China Education and Research Network 512
121.251.28.0/23 AS4538 China Education and Research Network 512
121.251.56.0/23 AS24362 China Education and Research Network 512
121.251.56.0/23 AS4538 China Education and Research Network 512
121.251.50.0/23 AS24362 China Education and Research Network 512
121.251.24.0/23 AS24362 China Education and Research Network 512
121.251.52.0/24 AS24362 China Education and Research Network 256
121.251.52.0/24 AS4538 China Education and Research Network 256

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

Pingable IPs

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

IP Address ASN Details
121.251.27.254 AS4538 China Education and Research Network Center 10.88ms from Shanghai, CN
121.251.26.27 AS4538 China Education and Research Network Center 12.54ms 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
24.131.199.7 AS7922 Comcast Cable Communications, LLC 10.87ms from Ashburn, US
161.199.23.23 AS393371 Microbilt Corporation 1.34ms from Atlanta, US
178.169.153.151 AS43205 Vivacom Bulgaria EAD 4.71ms from Sofia, BG
173.241.104.183 AS11727 Bruce Telecom 5.25ms from Toronto, CA
192.243.111.215 AS36454 WHG Hosting Services Ltd 0.30ms from Dallas, US
61.174.179.87 AS4134 CHINANET-BACKBONE 9.26ms from Hangzhou, CN
82.180.43.151 AS30848 UNIDATA S.p.A. 1.80ms from Milan, IT
212.33.26.215 AS30733 JSC "Globus-Telecom" 1.09ms from Moscow, RU
44.241.147.39 AS16509 Amazon.com, Inc. 0.15ms from Boardman, US
104.190.27.135 AS7018 AT&T Enterprises, LLC 1.94ms from Houston, US
162.214.61.39 AS46606 Unified Layer 15.07ms from Los Angeles, US
71.232.127.151 AS7922 Comcast Cable Communications, LLC 8.84ms from Boston, US
60.35.49.87 AS4713 NTT Communications Corporation 3.68ms from Tokyo, JP
135.131.78.7 AS4181 TDS TELECOM 10.40ms from Atlanta, US
3.142.123.103 AS16509 Amazon.com, Inc. 0.66ms from Columbus, US
5.12.143.231 AS8708 DIGI ROMANIA S.A. 0.87ms from Bucharest, RO
173.94.197.167 AS11426 Charter Communications Inc 11.24ms from Charlotte, US
87.21.176.247 AS3269 Telecom Italia S.p.A. 12.24ms from Milan, IT
62.245.139.55 AS8767 M-net Telekommunikations GmbH 0.65ms from Munich, DE
146.121.23.71 AS14864 NatWest Markets Securities Inc. 2.25ms from Secaucus, US
101.31.73.231 AS4837 CHINA UNICOM China169 Backbone 12.05ms from Tianjin, CN
199.96.46.135 AS36486 AMTOTE INTERNATIONAL, INC. 3.52ms from Ashburn, US
39.176.131.55 AS9808 China Mobile Communications Group Co., Ltd. 14.72ms from Changsha, CN
202.203.187.39 AS4538 China Education and Research Network Center 19.20ms from Chengdu, CN
78.105.215.183 AS5607 Sky UK Limited 4.02ms from London, GB

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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