131.155.0.0/16

inetnum:        131.155.0.0 - 131.155.255.255
netname:        TUENET1
descr:          P.O. Box 513
descr:          5600 MD Eindhoven
country:        NL
status:         LEGACY
remarks:        For general abuse like spam use the address
remarks:        abuse@tue.nl
remarks:        For security related contacts use the address
remarks:        security@tue.nl
admin-c:        DUMY-RIPE
tech-c:         DUMY-RIPE
org:            ORG-TUE2-RIPE
mnt-by:         RIPE-NCC-LEGACY-MNT
mnt-by:         SN-LIR-MNT
mnt-irt:        irt-SURFcert
created:        1970-01-01T00:00:00Z
last-modified:  2016-04-14T10:13:41Z
source:         RIPE
sponsoring-org: ORG-Sb3-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-TUE2-RIPE
org-name:       Technische Universiteit Eindhoven
org-type:       OTHER
address:        Dummy address for ORG-TUE2-RIPE
e-mail:         unread@ripe.net
mnt-by:         SN-LIR-MNT
mnt-ref:        SN-LIR-MNT
abuse-c:        SNS1-RIPE
created:        2015-08-06T09:19:17Z
last-modified:  2015-08-06T09:19:17Z
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.