121.251.56.0/23
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: 121.248.0.0/15 descr: CERNET origin: AS4538 mnt-by: MAINT-CERNET-AP last-modified: 2009-01-05T03:10:57Z source: APNIC
Overlapping Ranges
BGP prefixes that contain 121.251.56.0/23
| 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
5 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.
| IP Address | ASN | Details |
|---|---|---|
| 121.251.56.24 |
13.96ms 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 |
|---|---|---|
| 3.217.250.71 |
0.55ms from Ashburn,
US
|
|
| 71.66.231.183 |
6.51ms from Cleveland,
US
|
|
| 79.205.125.87 |
8.22ms from Frankfurt am Main,
DE
|
|
| 81.143.237.215 |
2.42ms from London,
GB
|
|
| 38.108.175.135 |
0.97ms from San Jose,
US
|
|
| 111.81.186.23 |
10.22ms from Taichung,
TW
|
|
| 74.110.172.55 |
4.69ms from Ashburn,
US
|
|
| 171.4.199.7 |
4.96ms from Bangkok,
TH
|
|
| 24.61.141.55 |
11.25ms from Boston,
US
|
|
| 102.117.130.7 |
1.72ms from Ebene,
MU
|
|
| 2.154.39.71 |
10.31ms from Madrid,
ES
|
|
| 123.243.55.135 |
1.14ms from Melbourne,
AU
|
|
| 58.216.49.183 |
3.28ms from Nanjing,
CN
|
|
| 67.87.7.135 |
7.86ms from New York City,
US
|
|
| 126.142.6.167 |
3.89ms from Osaka,
JP
|
|
| 149.169.219.199 |
0.59ms from Phoenix,
US
|
|
| 67.183.197.39 |
3.81ms from Seattle,
US
|
|
| 122.254.197.103 |
6.88ms from Seoul,
KR
|
|
| 210.107.75.119 |
0.98ms from Seoul,
KR
|
|
| 121.4.84.247 |
1.00ms from Shanghai,
CN
|
|
| 52.64.107.103 |
0.13ms from Sydney,
AU
|
|
| 175.151.227.183 |
12.79ms from Tieling,
CN
|
|
| 20.210.117.199 |
0.15ms from Tokyo,
JP
|
|
| 75.4.170.167 |
11.64ms from Atlanta,
US
|
|
| 65.17.171.103 |
2.73ms from Boston,
US
|
Traceroute
Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.
IPinfo ProbeNet
in Kuala Lumpur, MY
What are IP address ranges?
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