145.243.192.0/18

inetnum:        145.243.0.0 - 145.243.255.255
netname:        ASVNET
org:            ORG-ASVA1-RIPE
descr:          Axel Springer SE
country:        DE
admin-c:        DUMY-RIPE
tech-c:         DUMY-RIPE
status:         LEGACY
mnt-by:         NU-MNT
created:        1970-01-01T00:00:00Z
last-modified:  2019-12-04T13:07:31Z
source:         RIPE
remarks:        ****************************
remarks:        * THIS OBJECT IS MODIFIED
remarks:        * Please note that all data that is generally regarded as personal
remarks:        * data has been removed from this object.
remarks:        * To view the original object, please query the RIPE Database at:
remarks:        * http://www.ripe.net/whois
remarks:        ****************************


organisation:   ORG-ASVA1-RIPE
org-type:       OTHER
org-name:       Axel Springer SE
address:        Dummy address for ORG-ASVA1-RIPE
e-mail:         unread@ripe.net
mnt-ref:        NU-MNT
mnt-by:         NU-MNT
abuse-c:        ASAG2-RIPE
created:        2004-11-03T15:20:02Z
last-modified:  2014-11-20T16:42:18Z
source:         RIPE
remarks:        ****************************
remarks:        * THIS OBJECT IS MODIFIED
remarks:        * Please note that all data that is generally regarded as personal
remarks:        * data has been removed from this object.
remarks:        * To view the original object, please query the RIPE Database at:
remarks:        * http://www.ripe.net/whois
remarks:        ****************************

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.