inet6num: 2001,4cf8,,/32 netname: DE-MERCK-20050701 country: DE org: ORG-MK3-RIPE admin-c: MKRA1-RIPE tech-c: MKRA1-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: MERCK-MNT notify: firstname.lastname@example.org notify: email@example.com mnt-routes: MERCK-MNT mnt-domains: MERCK-MNT created: 2005-07-01T13,03,41Z last-modified: 2017-02-13T09,45,18Z source: RIPE organisation: ORG-MK3-RIPE org-name: Merck KGaA org-type: LIR address: Frankfurter Str. 250 HPC GO13/003 address: 64293 address: Darmstadt address: GERMANY phone: +496151728695 fax-no: +49615172918695 mnt-ref: RIPE-NCC-HM-MNT mnt-ref: MERCK-MNT notify: firstname.lastname@example.org notify: email@example.com notify: firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-by: MERCK-MNT admin-c: PH2998-RIPE admin-c: TT321-RIPE admin-c: AKO123-RIPE admin-c: SW1544-RIPE e-mail: email@example.com abuse-c: MA14484-RIPE created: 2005-05-20T10,11,05Z last-modified: 2017-02-13T09,45,19Z source: RIPE role: Merck KGaA Role Account address: Merck KGaA address: Frankfurter Str. 250 address: 64293 Darmstadt e-mail: firstname.lastname@example.org e-mail: email@example.com admin-c: MB826-RIPE admin-c: SW1544-RIPE admin-c: TT321-RIPE admin-c: AKO123-RIPE tech-c: TT321-RIPE nic-hdl: MKRA1-RIPE notify: firstname.lastname@example.org notify: email@example.com mnt-by: MERCK-MNT created: 2005-05-23T13,23,34Z last-modified: 2011-10-12T18,16,56Z source: RIPE route6: 2001,4cf8,,/32 descr: Merck KGaA origin: AS13167 mnt-by: MERCK-MNT created: 2011-04-21T08,52,11Z last-modified: 2011-04-21T08,52,11Z 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.