inet6num: 2a00,1cb8,2,b,,/64 netname: Server_Farm_FBKT2 country: GR admin-c: GEBE-RIPE tech-c: MBAL-RIPE status: ASSIGNED mnt-by: AS12713-MNT created: 2016-06-28T10,07,29Z last-modified: 2016-06-28T10,07,29Z source: RIPE person: George Benekos address: OTEGlobe S.A. address: 47 Em. Benaki Str. address: 10681, Athens, Hellas phone: +30-210-3303545 fax-no: +30-210-3303524 nic-hdl: GEBE-RIPE notify: email@example.com mnt-by: AS12713-MNT created: 2007-11-12T16,42,04Z last-modified: 2015-06-05T09,09,53Z source: RIPE person: Minas Balaskas address: OTEGlobe S.A. address: 47 Em. Mpenaki Str. address: 10681, Athens, Hellas phone: +30-210-3303369 fax-no: +30-210-3303524 nic-hdl: MBAL-RIPE notify: firstname.lastname@example.org mnt-by: AS12713-MNT created: 2008-06-25T08,31,42Z last-modified: 2015-06-05T09,09,00Z source: RIPE route6: 2a00,1cb8,2,b,,/64 descr: OTEGlobe - OTE Global Solutions SA origin: AS12713 mnt-by: AS12713-MNT created: 2015-11-13T11,56,50Z last-modified: 2015-11-13T11,56,50Z 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.