121.250.128.0/20

AS4538  ·  China Education and Research Network Center

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Summary

Country China
Domain cernet.edu.cn
ASN AS4538
Parent Range 121.250.0.0/15
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 121.250.128.0/20

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 121.250.0.0/16

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
121.250.96.0/19 AS24363 China Education and Research Network 8,192
121.250.96.0/19 AS4538 China Education and Research Network 8,192
121.250.160.0/19 AS24363 China Education and Research Network 8,192
121.250.160.0/19 AS4538 China Education and Research Network 8,192
121.250.208.0/20 AS24363 China Education and Research Network 4,096
121.250.208.0/20 AS4538 China Education and Research Network 4,096
121.250.240.0/20 AS4538 China Education and Research Network 4,096
121.250.240.0/20 AS24363 China Education and Research Network 4,096
121.250.0.0/20 AS24363 China Education and Research Network 4,096
121.250.192.0/20 AS4538 China Education and Research Network 4,096
121.250.0.0/20 AS4538 China Education and Research Network 4,096
121.250.192.0/20 AS24363 China Education and Research Network 4,096
121.250.144.0/20 AS4538 China Education and Research Network 4,096
121.250.144.0/20 AS24363 China Education and Research Network 4,096
121.250.32.0/20 AS24363 China Education and Research Network 4,096
121.250.32.0/20 AS4538 China Education and Research Network 4,096
121.250.224.0/21 AS24363 China Education and Research Network 2,048
121.250.80.0/21 AS4538 China Education and Research Network 2,048
121.250.80.0/21 AS24363 China Education and Research Network 2,048
121.250.16.0/21 AS24363 China Education and Research Network 2,048
121.250.16.0/21 AS4538 China Education and Research Network 2,048
121.250.24.0/21 AS24363 China Education and Research Network 2,048
121.250.24.0/21 AS4538 China Education and Research Network 2,048
121.250.224.0/21 AS4538 China Education and Research Network 2,048
121.250.56.0/21 AS24363 China Education and Research Network 2,048
121.250.56.0/21 AS4538 China Education and Research Network 2,048
121.250.88.0/23 AS24363 China Education and Research Network 512
121.250.88.0/23 AS4538 China Education and Research Network 512
121.250.48.0/23 AS24363 China Education and Research Network 512
121.250.48.0/23 AS4538 China Education and Research Network 512
121.250.50.0/24 AS4538 China Education and Research Network 256
121.250.50.0/24 AS24363 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

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

IP Address ASN Details
121.250.130.2 AS4538 China Education and Research Network Center 13.85ms 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
141.237.1.180 AS3329 VODAFONE-PANAFON HELLENIC TELECOMMUNICATIONS COMPANY SA 1.17ms from Athens, GR
202.106.21.100 AS4808 China Unicom Beijing Province Network 5.82ms from Beijing, CN
149.201.7.212 AS47610 RWTH Aachen University 4.62ms from Frankfurt am Main, DE
86.152.30.196 AS2856 British Telecommunications PLC 6.27ms from London, GB
180.142.97.100 AS4134 CHINANET-BACKBONE 2.07ms from Nanning, CN
217.78.204.20 AS16086 DNA Oyj 0.74ms from Oulu, FI
58.135.211.20 AS4847 China Networks Inter-Exchange 3.33ms from Tianjin, CN
141.94.164.100 AS16276 OVH SAS 0.11ms from Gravelines, FR
86.214.96.68 AS3215 Orange S.A. 4.86ms from Marseille, FR
74.13.249.228 AS577 Bell Canada 0.74ms from Montreal, CA
75.152.67.100 AS852 TELUS Communications Inc. 12.24ms from Montreal, CA
51.57.63.228 AS8075 Microsoft Corporation 0.20ms from Phoenix, US
64.15.176.4 AS6640 CenturyLink Communications, LLC 2.15ms from Santa Clara, US
121.229.191.148 AS134756 CHINANET Nanjing Jishan IDC network 5.51ms from Suzhou, CN
85.4.95.100 AS3303 Swisscom (Switzerland) Ltd 1.34ms from Zuerich, CH
66.109.157.52 AS21947 Blackfoot Telephone Cooperative, Inc. 14.20ms from Seattle, US
5.231.254.4 AS206264 Amarutu Technology Ltd 0.18ms from Tokyo, JP
97.228.225.164 AS6167 Verizon Business 19.72ms from Dallas, US
168.149.49.228 AS25019 Saudi Telecom Company JSC 2.81ms from Jeddah, SA
213.123.124.244 AS2856 British Telecommunications PLC 2.40ms from London, GB
79.7.160.148 AS3269 Telecom Italia S.p.A. 9.03ms from Milan, IT
184.152.41.212 AS12271 Charter Communications Inc 3.39ms from New York City, US
190.84.54.36 AS10620 Telmex Colombia S.A. 8.70ms from Bogota, CO
197.56.188.228 AS8452 TE-AS 2.45ms from Cairo, EG
47.183.225.84 AS5650 Frontier Communications of America, Inc. 1.15ms from Dallas, US

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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