121.251.132.0/22

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 121.251.132.0/22

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
121.251.128.0/22 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
121.251.26.0/23 AS4538 China Education and Research Network 512
121.251.26.0/23 AS24362 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

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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
94.3.240.134 AS5607 Sky UK Limited 3.61ms from London, GB
67.202.57.150 AS14618 Amazon.com, Inc. 0.23ms from Reston, US
181.84.255.86 AS7303 Telecom Argentina S.A. 1.45ms from Buenos Aires, AR
104.4.93.70 AS7018 AT&T Enterprises, LLC 2.61ms from Chicago, US
220.241.18.182 AS4515 PCCW IMS Ltd (PCCW Business Internet Access) 9.67ms from Hong Kong, HK
95.220.129.22 AS12714 PJSC MegaFon 4.90ms from Moscow, RU
126.115.80.150 AS17676 SoftBank Corp. 14.79ms from Tokyo, JP
87.102.171.246 AS6772 ImproWare AG 6.23ms from Zuerich, CH
12.228.30.6 AS7018 AT&T Enterprises, LLC 6.03ms from Atlanta, US
190.253.136.22 AS3816 COLOMBIA TELECOMUNICACIONES S.A. ESP BIC 3.13ms from Bogota, CO
12.245.209.70 AS7018 AT&T Enterprises, LLC 7.28ms from Chicago, US
154.85.213.134 AS134175 SH2206-AP 0.70ms from Hong Kong, HK
178.125.78.70 AS6697 Republican Unitary Telecommunication Enterprise Beltelecom 1.85ms from Minsk, BY
211.118.119.198 AS3786 LG DACOM Corporation 2.24ms from Seoul, KR
1.141.73.6 AS1221 Telstra Limited 15.21ms from Sydney, AU
119.46.12.54 AS7470 TRUE INTERNET Co.,Ltd. 0.45ms from Bangkok, TH
44.232.174.86 AS16509 Amazon.com, Inc. 0.14ms from Boardman, US
179.15.163.54 AS27831 Colombia Móvil 8.52ms from Bogota, CO
64.138.198.6 AS21565 Horry Telephone Cooperative, Inc. 8.55ms from Charlotte, US
167.7.244.198 AS2939 State of South Carolina 3.63ms from Charlotte, US
186.203.158.54 AS26615 TIM S/A 13.24ms from Fortaleza, BR
134.249.121.102 AS15895 "Kyivstar" PJSC 1.04ms from Kyiv, UA
68.7.27.134 AS22773 Cox Communications Inc. 6.90ms from Los Angeles, US
1.172.66.182 AS3462 Data Communication Business Group 3.21ms from Taichung, TW
113.61.130.102 AS17809 VEE TIME CORP. 3.71ms from Taipei, TW

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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