inet6num: 2001,67c,19dc,,/48 netname: SE-SVA country: SE org: ORG-SA988-RIPE admin-c: RJ173-RIPE tech-c: RJ173-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: IP-ONLY-MNT mnt-routes: IP-ONLY-MNT mnt-domains: IP-ONLY-MNT notify: firstname.lastname@example.org created: 2014-01-24T11,49,16Z last-modified: 2016-04-14T08,41,57Z source: RIPE sponsoring-org: ORG-ITCA1-RIPE organisation: ORG-SA988-RIPE org-name: Statens Veterinarmedicinska Anstalt org-type: OTHER address: Ulls Vag 2,756 51 Uppsala e-mail: email@example.com abuse-c: AR27122-RIPE mnt-ref: IP-ONLY-MNT mnt-by: IP-ONLY-MNT created: 2012-01-25T14,49,52Z last-modified: 2014-11-17T22,29,12Z source: RIPE person: Ronny Jansson address: Statens Veterinarmedicinska Anstalt address: S-751 89 Uppsala phone: +46 18 674000 fax-no: +46 18 309162 e-mail: firstname.lastname@example.org nic-hdl: RJ173-RIPE created: 2002-08-14T13,27,47Z last-modified: 2016-04-06T03,54,12Z mnt-by: RIPE-NCC-LOCKED-MNT source: RIPE route6: 2001,67c,19dc,,/48 descr: IP-ONLY origin: AS12552 mnt-by: IP-ONLY-MNT created: 2014-01-27T14,20,23Z last-modified: 2014-01-27T14,20,23Z 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.