121.250.208.0/20

AS4538 · China Education and Research Network Center

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Summary

Country	China
Domain	cernet.edu.cn
ASN	AS4538
Parent Range	121.248.0.0/14
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 Center,
address:        FIT-3-220, 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:        abuse@cernet.edu.cn was validated on 2026-03-05
mnt-by:         MAINT-CERNET-AP
last-modified:  2026-03-05T06:39:56Z
source:         APNIC

role:           ABUSE CERNETAP
country:        ZZ
address:        Network Center,
address:        FIT-3-220, 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 2026-03-05
abuse-mailbox:  abuse@cernet.edu.cn
mnt-by:         APNIC-ABUSE
last-modified:  2026-03-05T06:40:20Z
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 121.250.208.0/20

Range	ASN	Company	Num of IPs
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

Hosted domains

There are 3 domain names hosted across 3 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
121.250.208.51	xluan.love	1
121.250.223.140	omrailgun.org	1
121.250.209.55	uugogogo.com	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

4,096 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
121.250.215.81	AS4538 China Education and Research Network Center	`5.89ms` from Qingdao, CN
121.250.209.27	AS4538 China Education and Research Network Center	`5.96ms` from Qingdao, CN
121.250.213.186	AS4538 China Education and Research Network Center	`6.00ms` from Qingdao, CN
121.250.218.233	AS4538 China Education and Research Network Center	`5.95ms` from Qingdao, CN
121.250.216.232	AS4538 China Education and Research Network Center	`6.00ms` from Qingdao, CN
121.250.211.215	AS4538 China Education and Research Network Center	`5.99ms` from Qingdao, CN
121.250.222.191	AS4538 China Education and Research Network Center	`5.90ms` from Qingdao, CN
121.250.208.176	AS4538 China Education and Research Network Center	`5.91ms` from Qingdao, CN
121.250.214.119	AS4538 China Education and Research Network Center	`6.02ms` from Qingdao, CN
121.250.221.42	AS4538 China Education and Research Network Center	`5.88ms` from Qingdao, CN
121.250.212.254	AS4538 China Education and Research Network Center	`5.89ms` from Qingdao, CN
121.250.223.214	AS4538 China Education and Research Network Center	`6.05ms` from Qingdao, CN
121.250.210.125	AS4538 China Education and Research Network Center	`5.98ms` from Qingdao, CN
121.250.217.201	AS4538 China Education and Research Network Center	`5.91ms` from Qingdao, CN
121.250.219.49	AS4538 China Education and Research Network Center	`5.95ms` from Qingdao, CN
121.250.220.68	AS4538 China Education and Research Network Center	`5.92ms` from Qingdao, 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
40.76.121.52	AS8075 Microsoft Corporation	`0.64ms` from Ashburn, US
56.137.187.4	AS8987 Amazon Data Services Ireland Ltd	`0.30ms` from Boardman, US
216.68.98.212	AS6181 Cincinnati Bell Telephone Company LLC	`0.72ms` from Cincinnati, US
92.141.62.84	AS3215 Orange S.A.	`11.98ms` from Frankfurt am Main, DE
95.175.101.228	AS49282 Verne Vantaa Oy	`4.70ms` from Helsinki, FI
211.42.177.4	AS3786 LG DACOM Corporation	`1.68ms` from Incheon, KR
34.35.44.36	AS396982 Google LLC	`0.08ms` from Johannesburg, ZA
202.187.107.148	AS9930 TTNET-MY	`0.94ms` from Kuala Lumpur, MY
188.29.208.4	AS206067 Hutchison 3G UK Limited	`17.13ms` from London, GB
90.197.235.212	AS5607 Sky UK Limited	`7.10ms` from London, GB
176.120.179.244	AS51669 Home Computer Networks ltd.	`3.27ms` from Moscow, RU
217.128.101.68	AS3215 Orange S.A.	`2.12ms` from Paris, FR
189.80.131.164	AS7738 V tal	`7.15ms` from Rio de Janeiro, BR
191.255.40.228	AS27699 TELEFÔNICA BRASIL S.A	`2.38ms` from Sao Paulo, BR
112.164.94.244	AS4766 Korea Telecom	`6.36ms` from Seoul, KR
47.106.95.116	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`0.12ms` from Shenzhen, CN
122.117.165.100	AS3462 Data Communication Business Group	`3.29ms` from Taichung, TW
178.129.124.68	AS28812 PJSC Bashinformsvyaz	`9.18ms` from Yekaterinburg, RU
37.244.244.164	AS12810 A1 Hrvatska d.o.o.	`1.67ms` from Zagreb, HR
86.81.83.164	AS1136 KPN B.V.	`1.62ms` from Amsterdam, NL
76.152.41.20	AS7922 Comcast Cable Communications, LLC	`8.98ms` from Boston, US
181.47.211.100	AS27747 Telecentro S.A.	`5.37ms` from Buenos Aires, AR
68.39.210.52	AS7922 Comcast Cable Communications, LLC	`10.18ms` from Chicago, US
116.97.63.228	AS24086 Viettel Corporation	`2.91ms` from Hanoi, VN
154.210.25.180	AS400619 AROSSCLOUD INC.	`0.99ms` from Hong Kong, HK

Traceroute

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

traceroute -a -n -q1 -f8 121.250.209.49

traceroute to 121.250.209.49 (121.250.209.49): 64 hops max, 52 byte packets

8 [AS4538] 101.4.112.70 5.117 ms

9 *

10 *

11 *

12 *

13 [AS4538] 58.194.164.113 10.207 ms

14 [AS4538] 121.250.209.49 10.056 ms

Measurement taken from

IPinfo ProbeNet in Beijing, CN

On March 21st 2026

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