125.78.0.0/15

inetnum:        125.79.0.0 - 125.79.255.255
netname:        CHINANET-FJ
descr:          CHINANET Fujian province network
descr:          China Telecom
descr:          7,East Street ,Fuzhou ,Fujian ,PRC
country:        CN
admin-c:        FH71-AP
tech-c:         FH71-AP
remarks:        service provider
mnt-by:         APNIC-HM
mnt-lower:      MAINT-CHINANET-FJ
status:         ALLOCATED PORTABLE
last-modified:  2015-08-26T01:39:28Z
source:         APNIC
mnt-irt:        IRT-CHINANET-CN


irt:            IRT-CHINANET-CN
address:        No.31 ,jingrong street,beijing
address:        100032
e-mail:         anti-spam@ns.chinanet.cn.net
abuse-mailbox:  anti-spam@ns.chinanet.cn.net
admin-c:        CH93-AP
tech-c:         CH93-AP
auth:           # Filtered
mnt-by:         MAINT-CHINANET
changed:        anti-spam@ns.chinanet.cn.net 20101115
source:         APNIC

person:         FUJIANNET HOSTMASTER
nic-hdl:        FH71-AP
e-mail:         fjnic@fjdcb.fz.fj.cn
address:        7,East Street ,Fuzhou ,Fujian ,PRC
phone:          +86-591-83309761
fax-no:         +86-591-83371954
country:        CN
changed:        fjnic@fjdcb.fz.fj.cn 20100105
mnt-by:         MAINT-CHINANET-FJ
source:         APNIC

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.