inet6num: 2a02,ff0,c00,,/40 netname: AnkaraPop_Customers descr: TurkNet Iletisim Hizmetleri A.S country: TR admin-c: TL143-RIPE tech-c: TL143-RIPE status: ALLOCATED-BY-LIR mnt-by: MNT-TURKNET-MNT created: 2013-07-09T07,19,29Z last-modified: 2013-07-09T07,19,29Z source: RIPE person: TurkNet LIR address: TurkNet Iletisim Hizmetleri A.S. address: Buyukdere Cad. Ercan Han No.121 address: Gayrettepe / Istanbul / Turkey phone: +90 212 355 17 00 nic-hdl: TL143-RIPE created: 2009-03-05T10,03,41Z last-modified: 2011-08-24T12,18,33Z source: RIPE mnt-by: MNT-TURKNET-MNT route6: 2a02,ff0,c00,,/40 descr: TurkNet Iletisim Hizmetleri A.S origin: AS12735 mnt-by: MNT-TURKNET-MNT created: 2013-07-09T07,35,39Z last-modified: 2013-07-09T07,35,39Z 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.