121.250.0.0/20

AS4538  ·  China Education and Research Network Center

Need more data or want to access it via API or data downloads? Sign up to get free access

Sign up for free ›

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 121.250.0.0/20

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
121.250.192.0/20 AS4538 China Education and Research Network 4,096
121.250.128.0/20 AS24363 China Education and Research Network 4,096
121.250.192.0/20 AS24363 China Education and Research Network 4,096
121.250.128.0/20 AS4538 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

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
40.69.220.212 AS8075 Microsoft Corporation 0.23ms from Dublin, IE
50.65.103.148 AS6327 Shaw Communications Inc. 4.76ms from Edmonton, CA
74.133.105.4 AS10796 Charter Communications Inc 19.35ms from Flint, US
94.195.75.132 AS5607 Sky UK Limited 0.87ms from London, GB
46.249.26.100 AS50009 QUARTZ TELECOM LLC 1.11ms from Moscow, RU
3.111.121.36 AS16509 Amazon.com, Inc. 0.12ms from Mumbai, IN
62.34.162.68 AS5410 Bouygues Telecom SA 6.78ms from Paris, FR
39.184.105.228 AS56041 China Mobile communications corporation 6.81ms from Shanghai, CN
88.212.33.68 AS42841 ANTIK Telecom s.r.o 4.83ms from Bratislava, SK
151.21.200.84 AS1267 WIND TRE S.P.A. 7.53ms from Milan, IT
114.226.91.100 AS4134 CHINANET-BACKBONE 3.71ms from Nanjing, CN
211.110.61.4 AS9318 SK Broadband Co Ltd 1.76ms from Seoul, KR
111.232.241.132 AS10013 FreeBit Co.,Ltd. 19.30ms from Tokyo, JP
3.115.190.228 AS16509 Amazon.com, Inc. 0.16ms from Tokyo, JP
126.79.80.116 AS17676 SoftBank Corp. 2.70ms from Tokyo, JP
90.158.129.4 AS9021 Is Net Elektonik Bilgi Uretim Dagitim Ticaret ve Iletisim Hizmetleri A.S. 2.51ms from Istanbul, TR
24.88.26.148 AS11426 Charter Communications Inc 7.00ms from Charlotte, US
34.57.180.180 AS396982 Google LLC 0.12ms from Council Bluffs, US
173.243.13.212 AS13445 Cisco Webex LLC 1.26ms from Dallas, US
76.143.183.244 AS7922 Comcast Cable Communications, LLC 7.91ms from Houston, US
176.236.80.164 AS34984 Superonline Iletisim Hizmetleri A.S. 2.28ms from Istanbul, TR
24.198.69.180 AS11351 Charter Communications Inc 19.93ms from New York City, US
220.75.17.84 AS4766 Korea Telecom 5.06ms from Seoul, KR
91.185.141.244 AS58224 Iran Telecommunication Company PJS 15.30ms from Yerevan, AM
85.222.175.4 AS214427 Netvis d.o.o. 2.34ms from Zagreb, HR

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.

An API built with users in mind: reliable, accurate, and easy-to-use

Discover why industry-leading companies around the globe love our data. IPinfo's accurate insights fuel use cases from cybersecurity, data enrichment, web personalization, and much more.

IPinfo for all your IP geolocation needs

Our IP tools

Explore all tools
What is my IP

What is my IP

Test our data accuracy by viewing insights from your IP address.

See your IP address
Map IPs

Map IPs

Paste up to 500,000 IPs to see where they're located on a map.

Try Map IPs
Summarize IPs

Summarize IPs

Use our data visualization tool to create a visual overview of multiple IPs.

Try Summarize IPs