inet6num: 2a05,c4c0,,/29 netname: NL-SKYBERATE-20150211 country: NL org: ORG-SISB4-RIPE admin-c: ID1856-RIPE tech-c: ID1856-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: SKYBERATE-MNT mnt-lower: BIT-MNT mnt-lower: SKYBERATE-MNT mnt-routes: SKYBERATE-MNT mnt-routes: BIT-MNT created: 2015-02-11T14,09,14Z last-modified: 2017-09-25T13,19,25Z source: RIPE organisation: ORG-SISB4-RIPE org-name: Skyberate Internet Services B.V. org-type: LIR address: Jullianaplein 44 address: 7003DW address: Doetinchem address: NETHERLANDS phone: +31316712000 e-mail: email@example.com mnt-ref: RIPE-NCC-HM-MNT mnt-ref: SKYBERATE-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: SKYBERATE-MNT abuse-c: ID1856-RIPE created: 2015-02-04T15,19,33Z last-modified: 2017-09-25T13,19,26Z source: RIPE role: IT Department address: Julianaplein 44 7003DW Doetinchem e-mail: firstname.lastname@example.org admin-c: JB14761-RIPE tech-c: JB14761-RIPE abuse-mailbox: email@example.com nic-hdl: ID1856-RIPE mnt-by: SKYBERATE-MNT created: 2015-02-05T14,10,59Z last-modified: 2015-02-05T14,20,34Z source: RIPE route6: 2a05,c4c0,,/29 descr: Skyberate Internet Services B.V. origin: AS12859 notify: firstname.lastname@example.org mnt-by: BIT-MNT created: 2015-03-04T08,05,40Z last-modified: 2015-03-04T08,09,11Z 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.