5.145.128.0/20

inetnum:        5.145.128.0 - 5.145.143.255
netname:        DE-RELAIX-20120713
country:        DE
org:            ORG-RNG2-RIPE
admin-c:        DUMY-RIPE
tech-c:         DUMY-RIPE
status:         ALLOCATED PA
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-RELAIX
mnt-routes:     MNT-RELAIX
notify:         tn@relaix.net
created:        2012-07-13T07:36:13Z
last-modified:  2019-03-03T15:25:55Z
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-RNG2-RIPE
org-name:       RelAix Networks GmbH
org-type:       LIR
address:        Dummy address for ORG-RNG2-RIPE
e-mail:         unread@ripe.net
abuse-c:        AR14708-RIPE
mnt-ref:        MNT-RELAIX
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-RELAIX
created:        2008-07-03T10:06:11Z
last-modified:  2020-02-20T14:57:54Z
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.