121.251.216.0/21

AS4538 China Education and Research Network Center

121.251.216.0/21 - OUC-CN

ID

OUC-CN

Description

Qingdao Ocean University Broad Band Network

ASN

AS4538 China Education and Research Network Center

Country

China

Registry

apnic

Whois Details

inetnum:        121.251.216.0 - 121.251.223.255
netname:        OUC-CN
descr:          青岛海洋大薛3够赛尔宽带
descr:          Qingdao Ocean University Broad Band Network
descr:          Qingdao, Sandong 266031, China
country:        CN
remarks:        conn-id NJ000639
admin-c:        CER-AP
tech-c:         CER-AP
remarks:        origin AS4538
mnt-by:         MAINT-CERNET-AP
status:         ASSIGNED NON-PORTABLE
last-modified:  2009-05-15T05:31:06Z
source:         APNIC


role:           CERNET Helpdesk
address:        Room 224, Main Building
address:        Tsinghua University
address:        Beijing 100084, China
country:        CN
phone:          +86-10-6278-4049
fax-no:         +86-10-6278-5933
e-mail:         cernet-helpdesk-ip@net.edu.cn
remarks:        abuse@net.edu.cn
admin-c:        XL1-CN
tech-c:         SZ2-AP
nic-hdl:        CER-AP
remarks:        Point of Contact for admin-c
mnt-by:         MAINT-CERNET-AP
last-modified:  2011-12-06T00:10:30Z
source:         APNIC

Details

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.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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