1.51.0.0/16

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

Summary

Country	China
Domain	cernet.edu.cn
ASN	AS4538
Registry	APNIC
ID	NJR-CERNET

WHOIS Details

inetnum:        1.51.0.0 - 1.51.255.255
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:  2020-09-03T09:16:03Z
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 2025-08-15
mnt-by:         MAINT-CERNET-AP
last-modified:  2025-11-18T00:26:28Z
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 2025-08-15
abuse-mailbox:  abuse@cernet.edu.cn
mnt-by:         APNIC-ABUSE
last-modified:  2025-08-15T09:38:28Z
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:          1.51.0.0/16
descr:          CERNET
origin:         AS4538
mnt-by:         MAINT-CERNET-AP
last-modified:  2010-07-15T07:00:01Z
source:         APNIC

Nearby Ranges

BGP prefixes that overlap with 1.0.0.0/8

Range	ASN	Company	Num of IPs
1.128.0.0/11	AS1221	Telstra Limited	2,097,152
1.208.0.0/12	AS3786	LG DACOM Corporation	1,048,576
1.160.0.0/12	AS3462	Data Communication Business Group,	1,048,576
1.56.0.0/13	AS4837	China Unicom Heilongjiang province network	524,288
1.24.0.0/13	AS4837	China unicom InnerMongolia province network	524,288
1.24.0.0/13	AS9929	China unicom InnerMongolia province network	524,288
1.224.0.0/13	AS131852	SK Broadband Co Ltd	524,288
1.192.0.0/13	AS139018	CHINANET henan province network	524,288
1.224.0.0/13	AS10069	SK Broadband Co Ltd	524,288
1.192.0.0/13	AS137687	CHINANET henan province network	524,288
1.192.0.0/13	AS139587	CHINANET henan province network	524,288
1.80.0.0/13	AS134768	CHINANET SHAANXI PROVINCE NETWORK	524,288
1.80.0.0/13	AS4809	CHINANET SHAANXI PROVINCE NETWORK	524,288
1.224.0.0/13	AS23579	SK Broadband Co Ltd	524,288
1.24.0.0/13	AS139007	China unicom InnerMongolia province network	524,288
1.120.0.0/13	AS1221	Telstra Limited	524,288
1.224.0.0/13	AS9318	SK Broadband Co Ltd	524,288
1.80.0.0/13	AS4134	CHINANET SHAANXI PROVINCE NETWORK	524,288
1.192.0.0/13	AS4134	CHINANET henan province network	524,288
1.204.0.0/14	AS4134	CHINANET GUIZHOU PROVINCE NETWORK	262,144
1.180.0.0/14	AS4134	CHINANET NeiMengGu province network	262,144
1.68.0.0/14	AS4134	CHINANET SHANXI PROVINCE NETWORK	262,144
1.12.0.0/14	AS132203	Tencent cloud computing (Beijing) Co., Ltd.	262,144
1.68.0.0/14	AS132147	CHINANET SHANXI PROVINCE NETWORK	262,144
1.12.0.0/14	AS45090	Tencent cloud computing (Beijing) Co., Ltd.	262,144
1.68.0.0/14	AS142404	CHINANET SHANXI PROVINCE NETWORK	262,144
1.180.0.0/14	AS141006	CHINANET NeiMengGu province network	262,144
1.52.0.0/14	AS18403	FPT Telecom Company	262,144
1.188.0.0/14	AS4837	China Unicom Heilongjiang province network	262,144
1.112.0.0/14	AS17676	SOFTBANK Corp.	262,144
1.40.0.0/14	AS4804	OPTUS INTERNET - RETAIL	262,144
1.68.0.0/14	AS4809	CHINANET SHANXI PROVINCE NETWORK	262,144
1.116.0.0/15	AS45090	Tencent cloud computing (Beijing) Co., Ltd.	131,072
1.34.0.0/15	AS3462	Data Communication Business Group,	131,072
1.184.0.0/15	AS4538	China Education and Research Network	131,072
1.64.0.0/15	AS4760	PCCW Limited	131,072
1.48.0.0/15	AS4134	CHINANET GUIZHOU PROVINCE NETWORK	131,072
1.50.0.0/16	AS4134	CHINANET ningxia province network	65,536
1.5.0.0/16	AS4725	SoftBank Corp.	65,536
1.36.0.0/16	AS4760	PCCW Limited	65,536
1.64.0.0/16	AS4760	Hong Kong Telecommunications (HKT) Limited Mass Internet	65,536
1.65.0.0/16	AS4760	Hong Kong Telecommunications (HKT) Limited Mass Internet	65,536
1.65.0.0/16	AS9444	Hong Kong Telecommunications (HKT) Limited Mass Internet	65,536
1.186.0.0/16	AS8075	Microsoft Limited	65,536
1.164.0.0/16	AS3462	Chunghwa Telecom Co.,Ltd.	65,536
1.165.0.0/16	AS3462	Chunghwa Telecom Co.,Ltd.	65,536
1.162.0.0/16	AS3462	Chunghwa Telecom Co.,Ltd.	65,536
1.163.0.0/16	AS3462	Chunghwa Telecom Co.,Ltd.	65,536
1.166.0.0/16	AS3462	Chunghwa Telecom Co.,Ltd.	65,536
1.160.0.0/16	AS3462	Chunghwa Telecom Co.,Ltd.	65,536

Hosted domains

There are 6 domain names hosted across 5 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
1.51.2.46	cernic.net	2
1.51.86.180	doalias.site	1

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

Read more

Pingable IPs

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

IP Address	ASN	Details
1.51.5.5	AS4538 China Education and Research Network Center	`5.22ms` from Hangzhou, CN
1.51.3.26	AS4538 China Education and Research Network Center	`1.96ms` from Beijing, CN
1.51.29.58	AS4538 China Education and Research Network Center	`9.99ms` from Shanghai, CN
1.51.25.19	AS4538 China Education and Research Network Center	`9.67ms` from Shanghai, CN
1.51.24.7	AS4538 China Education and Research Network Center	`9.88ms` from Shanghai, CN
1.51.27.80	AS4538 China Education and Research Network Center	`7.24ms` from Shanghai, CN
1.51.26.5	AS4538 China Education and Research Network Center	`6.27ms` from Shanghai, CN
1.51.6.200	AS4538 China Education and Research Network Center	`1.60ms` from Beijing, CN
1.51.2.254	AS4538 China Education and Research Network Center	`1.59ms` from Beijing, CN
1.51.18.6	AS4538 China Education and Research Network Center	`10.09ms` from Shanghai, CN
1.51.1.5	AS4538 China Education and Research Network Center	`5.69ms` from Qingdao, CN
1.51.255.147	AS4538 China Education and Research Network Center	`6.09ms` from Qingdao, CN
1.51.112.1	AS4538 China Education and Research Network Center	`15.32ms` 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
67.1.119.96	AS209 CenturyLink Communications, LLC	`15.71ms` from Albuquerque, US
135.18.139.176	AS8075 Microsoft Corporation	`0.24ms` from Boydton, US
60.17.87.224	AS4837 CHINA UNICOM China169 Backbone	`8.54ms` from Harbin, CN
80.41.98.224	AS13285 TalkTalk Communications Limited	`6.46ms` from London, GB
3.8.209.128	AS16509 Amazon.com, Inc.	`0.15ms` from London, GB
86.156.138.48	AS2856 British Telecommunications PLC	`1.91ms` from London, GB
181.175.213.144	AS14522 SERVICIOS DE TELECOMUNICACIONES SETEL S.A. (XTRIM EC)	`2.35ms` from Quito, EC
170.83.247.128	AS271531 TURBO LOGNET TLN TELECOM LTDA	`1.19ms` from Rio de Janeiro, BR
170.64.189.160	AS14061 DigitalOcean, LLC	`0.23ms` from Sydney, AU
62.45.168.48	AS15435 DELTA Fiber Nederland B.V.	`2.15ms` from Amsterdam, NL
45.36.177.240	AS11426 Charter Communications Inc	`6.70ms` from Charlotte, US
78.26.128.16	AS34187 LLC Renome-Service	`6.69ms` from Kyiv, UA
175.165.91.32	AS4837 CHINA UNICOM China169 Backbone	`7.19ms` from Liaoyang, CN
5.224.52.112	AS12430 VODAFONE ESPANA S.A.U.	`10.80ms` from Madrid, ES
202.138.31.32	AS9443 Vocus Retail	`1.87ms` from Melbourne, AU
87.22.39.0	AS3269 Telecom Italia S.p.A.	`4.12ms` from Milan, IT
69.253.4.32	AS7922 Comcast Cable Communications, LLC	`10.57ms` from New York City, US
222.10.243.48	AS2516 KDDI CORPORATION	`8.49ms` from Osaka, JP
82.189.6.16	AS3269 Telecom Italia S.p.A.	`1.52ms` from Rome, IT
118.56.187.192	AS4766 Korea Telecom	`6.91ms` from Seoul, KR
83.145.30.240	AS12552 GlobalConnect AB	`0.62ms` from Stockholm, SE
54.68.169.192	AS16509 Amazon.com, Inc.	`0.17ms` from Boardman, US
91.45.14.208	AS3320 Deutsche Telekom AG	`4.26ms` from Hamburg, DE
146.168.101.128	AS11776 Breezeline	`6.67ms` from Miami, US
85.229.111.48	AS8434 Telenor Sverige AB	`0.95ms` from Stockholm, SE

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

traceroute -a -n -q1 -f4 -m15 1.51.217.220

traceroute to 1.51.217.220 (1.51.217.220): 15 hops max, 52 byte packets

4 [AS4134] 61.160.7.53 3.46 ms

5 *

6 *

7 *

8 *

9 [AS4538] 101.4.118.54 30.888 ms

10 [AS4538] 101.4.118.250 29.794 ms

11 *

12 [AS4538] 101.4.116.38 47.858 ms

13 *

14 *

15 *

Measurement taken from

IPinfo ProbeNet in Huai'an, CN

On December 20th 2025

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.

Get Started for Free Contact Sales