164.139.0.0/16

inetnum:        164.139.0.0 - 164.139.255.255
netname:        METRO
descr:          MGI METRO Group Information Technology GmbH
descr:          Duesseldorf
org:            ORG-MMGI1-RIPE
status:         LEGACY
remarks:        This space is statically assigned.
country:        DE
admin-c:        DUMY-RIPE
tech-c:         DUMY-RIPE
notify:         hostmaster@mgi.de
mnt-by:         AS8569-MNT
mnt-routes:     AS8569-MNT
mnt-domains:    AS8569-MNT
created:        2002-09-12T14:52:08Z
last-modified:  2016-01-06T10:17:50Z
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-MMGI1-RIPE
org-name:       METRO-nom GmbH
org-type:       LIR
address:        Dummy address for ORG-MMGI1-RIPE
e-mail:         unread@ripe.net
mnt-ref:        AS8569-MNT
mnt-ref:        AS286-MNT
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         AS8569-MNT
abuse-c:        HMM3-RIPE
created:        2004-04-17T11:10:07Z
last-modified:  2018-11-22T17:25:23Z
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.