94.46.21.0/24

inetnum:        94.46.21.0 - 94.46.21.255
netname:        PT-ALMOUROLTEC
descr:          PTISP IP SPACE
country:        PT
admin-c:        LUIS-RIPE
tech-c:         LUIS-RIPE
status:         ASSIGNED PA
mnt-by:         MNT-ALMOUROLTEC
created:        2019-02-01T12:29:10Z
last-modified:  2019-02-01T12:29:10Z
source:         RIPE

person:         Luis Inverno
address:        Estrada Nacional n3
address:        2250-028 Constancia
address:        Portugal
fax-no:         +351 249739154
phone:          +351 249739099
nic-hdl:        LUIS-RIPE
mnt-by:         MNT-ALMOUROLTEC
created:        2013-01-22T15:02:18Z
last-modified:  2017-10-30T22:24:12Z
source:         RIPE

route:          94.46.16.0/20
descr:          ALMOUROLTEC SERVICOS DE INFORMATICA E INTERNET LDA
origin:         AS24768
mnt-by:         MNT-ALMOUROLTEC
created:        2015-02-24T19:01:19Z
last-modified:  2015-02-24T19:01:19Z
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.