217.171.252.0/23

inetnum:        217.171.252.0 - 217.171.252.255
netname:        CNP-MGMT-11379
country:        DE
admin-c:        RW2160-RIPE
admin-c:        SN6741-RIPE
tech-c:         RW2160-RIPE
tech-c:         SN6741-RIPE
status:         ASSIGNED PA
mnt-by:         cnp-mnt
created:        2016-10-05T07:04:09Z
last-modified:  2018-09-03T15:42:26Z
source:         RIPE

person:         Robert Weininger
address:        pegasus gmbh
address:        Bayernstr. 10
address:        D-93128 Regenstauf
phone:          +49 9402 503 113
fax-no:         +49 9402 503 222
e-mail:         rw@pegasus-gmbh.de
nic-hdl:        RW2160-RIPE
mnt-by:         CNP-MNT
created:        2008-11-24T09:44:14Z
last-modified:  2017-10-30T22:03:43Z
source:         RIPE

person:         Stefan Nuber
address:        pegasus gmbh
address:        Bayernstr. 10
address:        D-93128 Regenstauf
phone:          +49 9402 503 300
fax-no:         +49 9402 503 222
e-mail:         sn@pegasus-gmbh.de
nic-hdl:        SN6741-RIPE
mnt-by:         cnp-mnt
created:        2018-09-03T15:23:46Z
last-modified:  2018-09-03T15:23:46Z
source:         RIPE

route:          217.171.252.0/24
origin:         AS15866
mnt-by:         cnp-mnt
created:        2016-04-07T15:04:58Z
last-modified:  2016-04-07T15:04:58Z
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.