inet6num: 2a01,2b0,,/29 netname: SE-IP-ONLY-20070216 country: SE org: ORG-ITCA1-RIPE admin-c: IR514-RIPE tech-c: IR514-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: IP-ONLY-MNT mnt-routes: IP-ONLY-MNT notify: email@example.com created: 2012-08-09T13,31,44Z last-modified: 2016-12-13T23,30,34Z source: RIPE organisation: ORG-ITCA1-RIPE org-name: IP-Only Networks AB org-type: LIR address: Bäverns Gränd 17 address: 753 81 address: UPPSALA address: SWEDEN phone: +46188431000 fax-no: +46188431399 e-mail: firstname.lastname@example.org admin-c: IR514-RIPE tech-c: IR514-RIPE admin-c: FR514-RIPE mnt-ref: IP-ONLY-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: IP-ONLY-MNT abuse-c: IR514-RIPE created: 2004-04-17T12,03,43Z last-modified: 2016-12-13T23,32,15Z source: RIPE role: IP-ONLY Registry address: S-753 81 Uppsala address: Sweden admin-c: FR514-RIPE tech-c: AL5633-RIPE nic-hdl: IR514-RIPE mnt-by: IP-ONLY-MNT e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org created: 2001-10-11T13,03,08Z last-modified: 2013-10-09T12,15,51Z source: RIPE route6: 2a01,2b0,,/29 descr: IP-ONLY origin: AS12552 mnt-by: IP-ONLY-MNT created: 2012-08-16T09,28,13Z last-modified: 2012-08-16T09,28,13Z 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.