139.6.0.0/16

inetnum:        139.6.0.0 - 139.6.255.255
netname:        IWZ-LAN
org:            ORG-FK18-RIPE
descr:          Campus IT
country:        DE
admin-c:        DUMY-RIPE
tech-c:         DUMY-RIPE
status:         LEGACY
mnt-by:         RIPE-NCC-LEGACY-MNT
mnt-by:         DFN-LIR-MNT
mnt-lower:      DFN-LIR-MNT
mnt-routes:     DFN-MNT
mnt-irt:        IRT-DFN-CERT
created:        1970-01-01T00:00:00Z
last-modified:  2016-04-14T09:56:08Z
source:         RIPE
sponsoring-org: ORG-DV1-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-FK18-RIPE
org-name:       Technische Hochschule Koeln
org-type:       OTHER
address:        Dummy address for ORG-FK18-RIPE
abuse-c:        CITS2-RIPE
e-mail:         unread@ripe.net
mnt-ref:        DFN-LIR-MNT
mnt-by:         DFN-LIR-MNT
created:        2013-10-22T12:03:26Z
last-modified:  2015-10-27T14:26:06Z
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.