121.251.176.0/20
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: 121.250.0.0/15 descr: CERNET origin: AS4538 mnt-by: MAINT-CERNET-AP last-modified: 2009-01-05T03:10:57Z source: APNIC
Overlapping Ranges
BGP prefixes that contain 121.251.176.0/20
| 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 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 |
|---|---|---|
| 121.251.176.100 |
15.62ms from Qingdao,
CN
|
|
| 121.251.191.193 |
17.46ms 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 |
|---|---|---|
| 5.76.198.244 |
2.00ms from Almaty,
KZ
|
|
| 54.157.152.20 |
0.62ms from Ashburn,
US
|
|
| 97.80.214.132 |
17.18ms from Atlanta,
US
|
|
| 62.57.253.36 |
5.53ms from Barcelona,
ES
|
|
| 20.57.108.228 |
0.29ms from Boydton,
US
|
|
| 4.184.79.36 |
0.29ms from Frankfurt am Main,
DE
|
|
| 14.29.102.68 |
2.34ms from Guangzhou,
CN
|
|
| 38.255.46.84 |
0.18ms from London,
GB
|
|
| 66.128.245.164 |
3.95ms from Nashville,
US
|
|
| 125.122.157.164 |
4.06ms from Ningbo,
CN
|
|
| 46.9.23.100 |
7.74ms from Oslo,
NO
|
|
| 47.208.105.228 |
15.99ms from San Jose,
US
|
|
| 61.80.57.100 |
5.44ms from Seoul,
KR
|
|
| 47.84.13.244 |
0.82ms from Singapore,
SG
|
|
| 213.103.80.52 |
15.28ms from Vilnius,
LT
|
|
| 194.181.179.4 |
9.09ms from Warsaw,
PL
|
|
| 117.70.218.148 |
13.62ms from Wuhan,
CN
|
|
| 23.50.97.148 |
0.32ms from Zuerich,
CH
|
|
| 81.204.132.116 |
1.38ms from Amsterdam,
NL
|
|
| 100.48.118.212 |
0.75ms from Ashburn,
US
|
|
| 35.174.7.132 |
0.58ms from Ashburn,
US
|
|
| 18.67.66.52 |
0.32ms from Ashburn,
US
|
|
| 3.102.83.180 |
0.44ms from Auckland,
NZ
|
|
| 180.180.126.132 |
10.76ms from Bangkok,
TH
|
|
| 58.21.11.148 |
2.14ms from Changchun,
CN
|
Traceroute
Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.
IPinfo ProbeNet
in Qingdao, 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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