78.162.208.0/21

inetnum:        78.162.0.0 - 78.162.255.255
netname:        TurkTelekom
descr:          TT ADSL-dynamic_ulus
country:        tr
admin-c:        TTBA1-RIPE
tech-c:         TTBA1-RIPE
status:         ASSIGNED PA
mnt-by:         as9121-mnt
notify:         ipg@turktelekom.com.tr
created:        2010-07-26T14:26:57Z
last-modified:  2010-07-26T14:28:41Z
source:         RIPE
abuse-email:    abuse@ttnet.com.tr
abuse-c:        AR12859-RIPE
abuse-org:      ORG-TT3-RIPE

role:           TT Administrative Contact Role
address:        Turk Telekomunikasyon A.S Turgut Ozal Blv. Aydinlikevler
address:        06103 ANKARA TURKEY
phone:          +90 312 555 0000
fax-no:         +90 312 313 1924
e-mail:         ipg@turktelekom.com.tr
admin-c:        BADB3-RIPE
abuse-mailbox:  abuse@ttnet.com.tr
tech-c:         BADB3-RIPE
tech-c:         BADB3-RIPE
tech-c:         BADB3-RIPE
nic-hdl:        TTBA1-RIPE
notify:         ipg@turktelekom.com.tr
mnt-by:         AS9121-MNT
created:        2002-02-28T12:22:28Z
last-modified:  2019-01-23T09:13:01Z
source:         RIPE

route:          78.160.0.0/11
descr:          TurkTelekom
origin:         AS9121
mnt-by:         AS9121-MNT
created:        2007-05-09T11:18:54Z
last-modified:  2007-05-09T11:18:54Z
source:         RIPE

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.