121.251.208.0/21
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 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: 121.250.0.0/15 descr: CERNET origin: AS4538 mnt-by: MAINT-CERNET-AP last-modified: 2009-01-05T03:10:57Z source: APNIC
Overlapping Ranges
BGP prefixes that contain 121.251.208.0/21
| 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
13 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.
| IP Address | ASN | Details |
|---|---|---|
| 121.251.208.1 |
1.49ms from Qingdao,
CN
|
|
| 121.251.210.1 |
1.65ms from Qingdao,
CN
|
|
| 121.251.213.12 |
1.60ms 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 |
|---|---|---|
| 86.97.110.213 |
5.44ms from Al Fujairah City,
AE
|
|
| 107.161.127.21 |
0.19ms from Ashburn,
US
|
|
| 139.217.84.101 |
4.25ms from Beijing,
CN
|
|
| 91.40.147.213 |
4.60ms from Berlin,
DE
|
|
| 84.169.55.133 |
5.50ms from Frankfurt am Main,
DE
|
|
| 93.207.73.213 |
3.97ms from Hamburg,
DE
|
|
| 80.150.188.133 |
1.57ms from Hamburg,
DE
|
|
| 117.5.93.181 |
4.82ms from Hanoi,
VN
|
|
| 83.102.9.37 |
5.19ms from Helsinki,
FI
|
|
| 118.141.210.117 |
1.42ms from Hong Kong,
HK
|
|
| 83.240.188.245 |
0.90ms from Lisbon,
PT
|
|
| 46.164.62.229 |
0.97ms from Ljubljana,
SI
|
|
| 51.7.74.229 |
9.49ms from London,
GB
|
|
| 184.166.36.5 |
18.16ms from Seattle,
US
|
|
| 116.123.226.101 |
6.23ms from Seoul,
KR
|
|
| 99.249.51.37 |
5.03ms from Toronto,
CA
|
|
| 190.224.175.37 |
16.72ms from Buenos Aires,
AR
|
|
| 18.118.245.85 |
0.10ms from Columbus,
US
|
|
| 62.242.34.133 |
0.83ms from Copenhagen,
DK
|
|
| 78.153.219.21 |
0.18ms from Dublin,
IE
|
|
| 51.89.59.117 |
0.13ms from Frankfurt am Main,
DE
|
|
| 76.171.198.181 |
6.16ms from Los Angeles,
US
|
|
| 81.34.51.165 |
1.91ms from Madrid,
ES
|
|
| 92.117.212.85 |
8.51ms from Nuernberg,
DE
|
|
| 122.151.115.213 |
3.38ms from Perth,
AU
|
Traceroute
Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.
IPinfo ProbeNet
in Hangzhou, 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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