inet6num: 2a00,ef60,,/32 netname: FR-CONSEILS-ET-SYSTEMES-INFORMATIQUES descr: CONSEILS & SYSTEMES INFORMATIQUES - INFRA & MUT Services country: FR admin-c: CSI92-RIPE tech-c: CSI92-RIPE status: ALLOCATED-BY-LIR mnt-by: CETSI-MNT created: 2015-08-25T15,42,26Z last-modified: 2015-09-15T13,36,53Z source: RIPE role: CetSI Networks Tech Contacts address: Conseils et Systemes Informatiques 93-105 Rue Veuve Lacroix 920022 Nanterre France e-mail: firstname.lastname@example.org admin-c: CN1260-RIPE tech-c: CN1260-RIPE tech-c: FRED-RIPE tech-c: OP69-RIPE abuse-mailbox: email@example.com nic-hdl: CSI92-RIPE mnt-by: CETSI-MNT created: 2006-12-11T15,00,47Z last-modified: 2013-07-25T16,08,08Z source: RIPE route6: 2a00,ef60,,/32 descr: CONSEILS ET SYSTEMES INFORMATIQUES origin: AS12826 mnt-by: CETSI-MNT created: 2014-06-16T07,03,40Z last-modified: 2014-06-16T07,03,40Z 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.