109.106.128.0/21

inetnum:        109.106.128.0 - 109.106.130.255
netname:        KVANT-TELECOM-RU
country:        RU
admin-c:        SUB8-RIPE
tech-c:         SUB8-RIPE
status:         ASSIGNED PA
mnt-by:         K-T-MNT
created:        2018-12-10T13:26:59Z
last-modified:  2018-12-10T13:26:59Z
source:         RIPE

person:         S U B
address:        Nikitinskaya str.,
address:        Voronezh, Russia
phone:          +7 4732 531133
nic-hdl:        SUB8-RIPE
mnt-by:         ARTN-MNT
created:        2009-04-05T11:11:28Z
last-modified:  2018-05-30T07:31:16Z
source:         RIPE

route:          109.106.128.0/21
descr:          JSC Kvant-Telecom
origin:         AS43727
mnt-by:         K-T-MNT
created:        2010-06-25T08:41:06Z
last-modified:  2010-06-25T10:33:23Z
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.