inet6num: 2a03,f440,,/32 netname: SE-MAINTRAC-20130206 country: SE org: ORG-MA687-RIPE admin-c: MR16640-RIPE tech-c: MR16640-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-lower: MAINTRAC-SE-MNT mnt-routes: IP-ONLY-MNT notify: firstname.lastname@example.org created: 2013-02-06T10,38,59Z last-modified: 2016-04-14T08,27,23Z source: RIPE organisation: ORG-MA687-RIPE org-name: Maintrac AB org-type: LIR address: Wallenbergs gata 4 address: 58330 address: Linkoping address: SWEDEN phone: +4613131300 fax-no: +46 e-mail: email@example.com admin-c: AM35723-RIPE admin-c: NH3581-RIPE mnt-ref: MAINTRAC-SE-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT abuse-c: MR16640-RIPE created: 2013-02-04T15,44,55Z last-modified: 2015-09-23T17,49,58Z source: RIPE role: Maintrac Registry address: Wallenbergs Gata 4 address: 58330 Linkoping address: Sweden phone: +4613131300 e-mail: firstname.lastname@example.org admin-c: AM35723-RIPE tech-c: AM35723-RIPE nic-hdl: MR16640-RIPE notify: email@example.com abuse-mailbox: firstname.lastname@example.org mnt-by: MAINTRAC-SE-MNT created: 2013-02-05T10,01,52Z last-modified: 2015-01-05T17,17,33Z source: RIPE route6: 2a03,f440,,/32 descr: Maintrac origin: AS12552 mnt-by: IP-ONLY-MNT created: 2013-04-03T07,30,08Z last-modified: 2013-04-03T07,30,08Z 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.