inet6num: 2a02,c2c0,,/29 netname: UK-ECLIPSE-20120918 country: GB org: ORG-EN5-RIPE admin-c: EIR3-RIPE tech-c: EIR3-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-lower: ECHM1-RIPE-MNT mnt-routes: ECHM1-RIPE-MNT notify: email@example.com created: 2012-09-18T14,20,39Z last-modified: 2016-04-14T08,32,47Z source: RIPE organisation: ORG-EN5-RIPE org-name: KCOM GROUP PLC org-type: LIR address: Phoenix House, 32 West Street address: BN1 2RT address: Brighton address: UNITED KINGDOM phone: +44 1392333333 fax-no: +44 1392333334 e-mail: firstname.lastname@example.org admin-c: EIR3-RIPE admin-c: MA15819-RIPE admin-c: AR20994-RIPE admin-c: JT5873-RIPE admin-c: ECHM1-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: ECHM1-RIPE-MNT mnt-by: RIPE-NCC-HM-MNT abuse-c: EIR3-RIPE created: 2004-04-17T12,13,57Z last-modified: 2016-03-24T15,11,47Z source: RIPE role: Eclipse Internet - Ripe Admin address: Eclipse Internet, address: Osprey House, Osprey Road, address: Exeter, Devon EX2 7JG address: GB phone: +44 1392 333333 fax-no: +44 1392 333310 e-mail: email@example.com remarks: spam and abuse complaints = mailto,firstname.lastname@example.org admin-c: JT5873-RIPE tech-c: ECHM1-RIPE tech-c: JT5873-RIPE nic-hdl: EIR3-RIPE remarks: Eclipse Internet notify: email@example.com mnt-by: ECLINET-NMC created: 2002-08-19T14,56,52Z last-modified: 2008-11-03T14,36,53Z source: RIPE abuse-mailbox: firstname.lastname@example.org route6: 2a02,c2c0,,/29 descr: Eclipse Internet origin: AS12513 mnt-by: ECHM1-RIPE-MNT created: 2013-01-02T16,20,18Z last-modified: 2013-01-02T16,20,18Z 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.