inet6num: 2a03,36c0,,/32 netname: CH-SPAIXX-20121026 country: CH org: ORG-sG96-RIPE admin-c: MP24157-RIPE tech-c: MP24157-RIPE status: ALLOCATED-BY-RIR notify: email@example.com mnt-by: RIPE-NCC-HM-MNT mnt-by: spaixx-mnt created: 2012-10-26T14,11,13Z last-modified: 2016-06-30T10,25,50Z source: RIPE organisation: ORG-sG96-RIPE org-name: spaixx GmbH org-type: LIR address: Seemattweg 21 address: 6403 address: Kuessnacht am Rigi address: SWITZERLAND phone: +41418541020 fax-no: +41418541027 e-mail: firstname.lastname@example.org admin-c: MP24157-RIPE abuse-c: SGAT1-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: spaixx-mnt abuse-mailbox: email@example.com mnt-by: RIPE-NCC-HM-MNT mnt-by: spaixx-mnt created: 2012-10-23T13,21,52Z last-modified: 2016-06-30T10,25,49Z source: RIPE person: Martin Paierl address: Seemattweg 21 phone: +41 41 854 10 20 e-mail: firstname.lastname@example.org nic-hdl: MP24157-RIPE mnt-by: spaixx-mnt created: 2012-10-24T14,19,15Z last-modified: 2012-10-24T14,19,16Z source: RIPE route6: 2a03,36c0,,/32 descr: CH-SPAIXX-20121026 descr: spaixx GmbH origin: AS12329 notify: email@example.com notify: firstname.lastname@example.org mnt-by: spaixx-mnt created: 2014-12-10T11,40,28Z last-modified: 2014-12-10T11,40,28Z 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.