inet6num: 2001,678,240,,/48 netname: SE-ITGARDEN-20160915 country: SE org: ORG-DSA79-RIPE sponsoring-org: ORG-IGiL2-RIPE admin-c: itgr2-ripe tech-c: itgr2-ripe status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: ITGARDEN-MNT created: 2016-09-15T10,07,15Z last-modified: 2016-10-20T11,22,46Z source: RIPE mnt-routes: AS1257-MNT organisation: ORG-DSA79-RIPE org-name: Diaverum Sweden AB org-type: OTHER address: Box 4167 address: 227 22 address: LUND address: SWEDEN e-mail: firstname.lastname@example.org abuse-c: ITGR2-RIPE mnt-ref: ITGARDEN-MNT mnt-by: ITGARDEN-MNT created: 2016-09-02T13,56,35Z last-modified: 2016-09-02T13,56,35Z source: RIPE role: IT Garden Registry address: IT Garden i Landskrona AB address: Orja Skolvag 15 address: 261 91 LANDSKRONA address: Sweden phone: +46 418 44 88 40 fax-no: +46 418 769 29 e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org admin-c: ANPA1-RIPE tech-c: ANPA1-RIPE admin-c: FRAN2-RIPE tech-c: FRAN2-RIPE admin-c: JEHA2-RIPE tech-c: JEHA2-RIPE admin-c: JOTI2-RIPE tech-c: JOTI2-RIPE admin-c: mist8-ripe tech-c: mist8-ripe nic-hdl: ITGR2-RIPE mnt-by: ITGARDEN-MNT created: 2011-05-11T14,12,57Z last-modified: 2013-03-07T13,48,08Z source: RIPE route6: 2001,678,240,,/48 descr: TELE2/ SWIPNET descr: TELE2-ITGARDEN In case of improper use originating from this network, please mail or origin: AS1257 notify: email@example.com notify: firstname.lastname@example.org mnt-by: AS1257-MNT created: 2016-10-20T11,50,59Z last-modified: 2016-10-20T11,50,59Z source: RIPE
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.