121.251.16.0/21
AS4538 · China Education and Research Network Center
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| 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 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: 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 121.251.16.0/21
| 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 121.251.0.0/16
| Range | ASN | Company | Num of IPs |
|---|---|---|---|
| 121.248.0.0/14 | AS4538 | China Education and Research Network | 262,144 |
Hosted domains
There are no domains currently hosted on this ASN.
Hosted domains API
Pingable IPs
38 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.
| IP Address | ASN | Details |
|---|---|---|
| 121.251.19.157 |
10.35ms from Shanghai,
CN
|
|
| 121.251.17.1 |
10.94ms 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 |
|---|---|---|
| 92.70.216.101 |
1.77ms from Amsterdam,
NL
|
|
| 171.103.205.165 |
1.92ms from Bangkok,
TH
|
|
| 218.27.172.197 |
2.85ms from Changchun,
CN
|
|
| 216.207.8.133 |
1.88ms from Chicago,
US
|
|
| 24.14.62.229 |
5.01ms from Chicago,
US
|
|
| 68.232.163.21 |
0.10ms from Dallas,
US
|
|
| 178.15.36.85 |
0.73ms from Hamburg,
DE
|
|
| 195.59.90.5 |
4.12ms from London,
GB
|
|
| 90.73.207.229 |
4.45ms from Marseille,
FR
|
|
| 79.56.221.133 |
4.08ms from Milan,
IT
|
|
| 180.17.14.213 |
10.51ms from Osaka,
JP
|
|
| 23.216.175.245 |
0.14ms from Osasco,
BR
|
|
| 27.204.88.85 |
5.06ms from Qingdao,
CN
|
|
| 4.201.176.133 |
0.18ms from Sao Paulo,
BR
|
|
| 211.192.161.85 |
1.00ms from Seoul,
KR
|
|
| 119.73.132.165 |
1.85ms from Singapore,
SG
|
|
| 186.148.255.5 |
5.13ms from Buenos Aires,
AR
|
|
| 67.224.12.181 |
14.79ms from Chicago,
US
|
|
| 49.89.41.5 |
6.11ms from Huai'an,
CN
|
|
| 182.215.90.197 |
1.87ms from Incheon,
KR
|
|
| 90.193.34.197 |
1.62ms from London,
GB
|
|
| 159.183.181.21 |
6.29ms from Los Angeles,
US
|
|
| 72.197.221.69 |
8.47ms from Los Angeles,
US
|
|
| 46.141.55.197 |
5.57ms from Milan,
IT
|
|
| 91.149.176.213 |
0.92ms from Minsk,
BY
|
Traceroute
Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.
IPinfo ProbeNet
in Shanghai, CN
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.
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