202.173.218.0/24

inetnum:        202.173.218.0 - 202.173.218.255
netname:        Kirz-South
descr:          Kirz ISP province network
country:        TH
admin-c:        SA247-AP
tech-c:         SA247-AP
status:         ASSIGNED NON-PORTABLE
mnt-by:         MAINT-TH-KIRZ
last-modified:  2010-03-17T09:55:58Z
source:         APNIC


person:         Sarayut Assawarachan
nic-hdl:        SA247-AP
e-mail:         sarayut@kirz.com
address:        192 Soi Ladprao 107
address:        Klongchan, Bangkapi
address:        Bangkok 10240
phone:          +66-2731-1480
fax-no:         +66-2731-1140
country:        TH
changed:        sarayut@kirz.com 20091229
mnt-by:         MAINT-TH-KIRZ
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.