5.187.80.0/24

inetnum:        5.187.80.0 - 5.187.95.255
netname:        SVYAZ-TELECOM-RU
descr:          Svyaz-Telecom
descr:          Multiservice network access
descr:          pppoe dynamic ip pool
country:        RU
admin-c:        SUB8-RIPE
tech-c:         OYG1-RIPE
status:         ASSIGNED PA
mnt-by:         K-T-MNT
mnt-lower:      MNT-SVYAZ-TELECOM
mnt-routes:     MNT-SVYAZ-TELECOM
mnt-domains:    MNT-SVYAZ-TELECOM
created:        2012-09-07T05:50:47Z
last-modified:  2012-09-07T05:50:47Z
source:         RIPE
abuse-email:    abuse@kvant-telecom.ru
abuse-c:        AR16757-RIPE
abuse-org:      ORG-CJSC21-RIPE

person:         Oleg Yuryevich Gnedyh
address:        22 Eremeeva str.,
address:        Voronezh, Russia
phone:          +74732330330
nic-hdl:        OYG1-RIPE
mnt-by:         K-T-MNT
created:        2007-09-16T14:36:00Z
last-modified:  2018-03-28T11:49:27Z
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:          5.187.80.0/20
descr:          Svyaz-Telecom Ltd.
origin:         AS44604
mnt-by:         MNT-SVYAZ-TELECOM
created:        2012-09-07T05:52:09Z
last-modified:  2012-09-07T05:52:09Z
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.