inet6num: 2a03,aa40,,/34 netname: TOCARIO_CUSTOMER_POOL descr: tocario GmbH country: DE admin-c: ML14929-RIPE tech-c: ML14929-RIPE status: AGGREGATED-BY-LIR assignment-size: 56 mnt-by: ML63566-MNT created: 2013-10-09T09,50,32Z last-modified: 2013-10-09T10,24,49Z source: RIPE mnt-routes: TXX-MNT person: Mario Lombardo address: Rotebuehlplatz 20a address: 70173 Stuttgart phone: +49 711 46057140 e-mail: firstname.lastname@example.org nic-hdl: ML14929-RIPE mnt-by: ML63566-MNT created: 2012-12-20T14,09,50Z last-modified: 2016-08-11T09,29,14Z source: RIPE route6: 2a03,aa40,,/34 descr: tocario GmbH origin: AS12843 mnt-by: TXX-MNT created: 2013-10-10T08,22,11Z last-modified: 2013-10-10T08,22,11Z 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.