121.248.184.0/21
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: 121.248.0.0/15 descr: CERNET origin: AS4538 mnt-by: MAINT-CERNET-AP last-modified: 2009-01-05T03:10:57Z source: APNIC
Overlapping Ranges
BGP prefixes that contain 121.248.184.0/21
| 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 121.248.0.0/16
| 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
4 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.
| IP Address | ASN | Details |
|---|---|---|
| 121.248.191.31 |
13.65ms from Shanghai,
CN
|
|
| 121.248.184.1 |
12.58ms 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 |
|---|---|---|
| 196.250.97.21 |
3.97ms from Brazzaville,
CG
|
|
| 176.180.182.101 |
4.26ms from Frankfurt am Main,
DE
|
|
| 92.222.235.165 |
0.06ms from Gravelines,
FR
|
|
| 210.6.252.101 |
0.47ms from Hong Kong,
HK
|
|
| 99.72.196.37 |
2.65ms from Kansas City,
US
|
|
| 73.56.181.69 |
2.11ms from Miami,
US
|
|
| 199.193.229.133 |
17.90ms from New York City,
US
|
|
| 189.230.140.245 |
15.31ms from Santiago de Queretaro,
MX
|
|
| 201.44.114.5 |
0.34ms from Sao Paulo,
BR
|
|
| 142.231.116.5 |
3.58ms from Seattle,
US
|
|
| 125.180.18.101 |
1.69ms from Seoul,
KR
|
|
| 146.56.154.213 |
0.18ms from Seoul,
KR
|
|
| 52.131.245.21 |
2.60ms from Shanghai,
CN
|
|
| 119.161.90.149 |
0.31ms from Sydney,
AU
|
|
| 60.223.217.149 |
2.37ms from Taiyuan,
CN
|
|
| 87.244.213.85 |
0.29ms from Bratislava,
SK
|
|
| 3.15.150.101 |
0.17ms from Columbus,
US
|
|
| 176.34.253.181 |
0.18ms from Dublin,
IE
|
|
| 93.239.230.117 |
3.39ms from Duesseldorf,
DE
|
|
| 42.113.213.21 |
1.20ms from Hanoi,
VN
|
|
| 80.20.215.149 |
3.54ms from Milan,
IT
|
|
| 80.104.156.229 |
15.36ms from Naples,
IT
|
|
| 108.41.183.37 |
2.57ms from New York City,
US
|
|
| 219.127.194.149 |
1.77ms from Osaka,
JP
|
|
| 85.167.255.37 |
2.43ms from Oslo,
NO
|
Traceroute
Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.
IPinfo ProbeNet
in Lisbon, PT
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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