121.251.128.0/22

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 121.251.128.0/22

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
121.251.132.0/22 AS24363 China Education and Research Network 1,024
121.251.132.0/22 AS4538 China Education and Research Network 1,024
121.251.32.0/22 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

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

IP Address ASN Details
121.251.128.253 AS4538 China Education and Research Network Center 11.33ms 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
63.151.175.118 AS209 CenturyLink Communications, LLC 13.92ms from Durham, US
175.20.124.198 AS4837 CHINA UNICOM China169 Backbone 8.21ms from Liaoyang, CN
45.27.239.86 AS7018 AT&T Enterprises, LLC 11.10ms from Miami, US
99.32.15.86 AS7018 AT&T Enterprises, LLC 12.10ms from San Antonio, US
202.42.98.230 AS4628 Pacific Internet Pte Ltd 0.76ms from Singapore, SG
20.198.136.198 AS8075 Microsoft Corporation 0.24ms from Singapore, SG
73.143.144.182 AS7922 Comcast Cable Communications, LLC 6.28ms from Boston, US
24.39.103.6 AS11351 Charter Communications Inc 13.65ms from Chicago, US
74.208.117.38 AS8560 IONOS SE 0.80ms from Kansas City, US
207.237.77.6 AS6079 RCN 4.32ms from New York City, US
69.127.251.230 AS6128 Cablevision Systems Corp. 4.97ms from New York City, US
178.223.25.86 AS8400 TELEKOM SRBIJA a.d. 1.11ms from Belgrade, RS
92.224.201.70 AS6805 Telefonica Germany GmbH & Co.OHG 2.84ms from Berlin, DE
81.147.28.6 AS2856 British Telecommunications PLC 4.09ms from London, GB
79.31.249.38 AS3269 Telecom Italia S.p.A. 1.60ms from Milan, IT
81.28.218.150 AS39586 NPP Saturn Telecom Ltd. 1.57ms from Novosibirsk, RU
178.176.143.70 AS31133 PJSC MegaFon 0.61ms from Saint Petersburg, RU
172.120.195.70 AS214238 HOST TELECOM LTD 0.13ms from Secaucus, US
124.54.6.198 AS17858 LG POWERCOMM 6.76ms from Seoul, KR
14.204.137.22 AS4837 CHINA UNICOM China169 Backbone 3.64ms from Kunming, CN
35.168.128.86 AS14618 Amazon.com, Inc. 0.17ms from Reston, US
145.239.23.150 AS16276 OVH SAS 0.09ms from Warsaw, PL
34.46.99.118 AS396982 Google LLC 0.11ms from Council Bluffs, US
213.89.100.150 AS1257 Tele2 Sverige AB 7.32ms from Goeteborg, SE
91.223.212.6 AS197645 GCI Sp. z o.o. 0.71ms from Poznan, PL

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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