121.251.240.0/20
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: [email protected] abuse-mailbox: [email protected] admin-c: CER-AP tech-c: CER-AP auth: # Filtered remarks: timezone GMT+8 remarks: http://www.ccert.edu.cn remarks: [email protected] 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: [email protected] admin-c: CER-AP tech-c: CER-AP nic-hdl: AC1685-AP remarks: Generated from irt object IRT-CERNET-AP remarks: [email protected] was validated on 2025-08-15 abuse-mailbox: [email protected] 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: [email protected] remarks: [email protected] 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 121.251.240.0/20
| 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 121.251.0.0/16
| Range | ASN | Company | Num of IPs |
|---|---|---|---|
| 121.248.0.0/14 | AS4538 | China Education and Research Network | 262,144 |
Hosted domains
There are 3 domain names hosted across 2 IP addresses on this ASN. Checkout our API to access full domain hosting information.
| IP Address | Domain | Domains on this IP |
|---|---|---|
| 121.251.249.56 | upc.edu.cn | 2 |
| 121.251.249.55 | xn--cesx9m.club | 1 |
Hosted domains API
Pingable IPs
27 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.
| IP Address | ASN | Details |
|---|---|---|
| 121.251.248.13 |
2.05ms from Qingdao,
CN
|
|
| 121.251.251.248 |
1.44ms from Qingdao,
CN
|
|
| 121.251.252.216 |
1.32ms from Qingdao,
CN
|
|
| 121.251.253.201 |
1.82ms from Qingdao,
CN
|
|
| 121.251.255.38 |
1.34ms from Qingdao,
CN
|
|
| 121.251.249.7 |
1.31ms 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 |
|---|---|---|
| 89.6.33.244 |
4.64ms from Barcelona,
ES
|
|
| 124.192.181.100 |
4.86ms from Beijing,
CN
|
|
| 34.211.198.4 |
0.14ms from Boardman,
US
|
|
| 223.155.144.20 |
7.16ms from Chenzhou,
CN
|
|
| 174.182.82.4 |
9.88ms from Chicago,
US
|
|
| 149.137.197.84 |
0.98ms from Dallas,
US
|
|
| 99.151.53.244 |
2.72ms from Miami,
US
|
|
| 90.47.17.148 |
14.37ms from Paris,
FR
|
|
| 190.63.95.4 |
2.13ms from Quito,
EC
|
|
| 44.223.47.68 |
0.35ms from Reston,
US
|
|
| 116.41.0.100 |
2.38ms from Seoul,
KR
|
|
| 210.179.69.164 |
4.53ms from Seoul,
KR
|
|
| 125.141.6.20 |
1.28ms from Seoul,
KR
|
|
| 222.238.18.4 |
5.88ms from Seoul,
KR
|
|
| 72.247.223.100 |
0.35ms from Sydney,
AU
|
|
| 219.108.23.52 |
2.40ms from Tokyo,
JP
|
|
| 197.10.184.116 |
1.67ms from Tunis,
TN
|
|
| 170.247.195.100 |
10.27ms from Curitiba,
BR
|
|
| 125.94.202.36 |
3.10ms from Guangzhou,
CN
|
|
| 1.211.73.132 |
1.79ms from Incheon,
KR
|
|
| 103.130.239.20 |
12.11ms from Karachi,
PK
|
|
| 202.92.28.20 |
1.48ms from Karachi,
PK
|
|
| 90.18.254.20 |
7.56ms from Marseille,
FR
|
|
| 217.59.240.196 |
3.15ms from Milan,
IT
|
|
| 176.209.223.4 |
5.68ms from Novosibirsk,
RU
|
Traceroute
Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.
IPinfo ProbeNet
in Derby, GB
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