inet6num: 2a01,4400,,/32 netname: SE-ITGARDEN-20101228 country: SE org: ORG-IGiL2-RIPE admin-c: ANPA1-RIPE admin-c: FRAN2-RIPE tech-c: ANPA1-RIPE tech-c: FRAN2-RIPE status: ALLOCATED-BY-RIR notify: email@example.com mnt-by: RIPE-NCC-HM-MNT mnt-by: ITGARDEN-MNT mnt-lower: ITGARDEN-MNT mnt-routes: AS1257-MNT created: 2010-12-28T12,43,47Z last-modified: 2016-09-02T13,30,52Z source: RIPE organisation: ORG-IGiL2-RIPE org-name: IT Garden i Landskrona AB org-type: LIR address: Orja Skolvag 15 address: 26191 address: Landskrona address: SWEDEN phone: +46418448840 fax-no: +4641876929 e-mail: firstname.lastname@example.org admin-c: FRAN2-RIPE admin-c: ANPA1-RIPE admin-c: MIST8-RIPE admin-c: JOTI2-RIPE admin-c: MC1414-RIPE admin-c: JEHA2-RIPE abuse-c: itgr2-ripe mnt-ref: RIPE-NCC-HM-MNT mnt-ref: ITGARDEN-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: ITGARDEN-MNT created: 2009-08-11T09,06,32Z last-modified: 2016-10-06T15,34,07Z source: RIPE person: Andreas Paulsson address: IT Garden i Landskrona AB address: Orja Skolvag 15 address: 261 91 Landskrona address: Sweden phone: +46 418 769 12 fax-no: +46 418 769 29 e-mail: email@example.com nic-hdl: ANPA1-RIPE mnt-by: ITGARDEN-MNT created: 2009-07-14T12,15,49Z last-modified: 2009-08-12T06,48,00Z source: RIPE person: Fredrik Andersson address: IT Garden i Landskrona AB address: Orja Skolvag 15 address: 261 91 Landskrona address: Sweden phone: +46 418 44 88 40 fax-no: +46 418 769 29 e-mail: firstname.lastname@example.org nic-hdl: FRAN2-RIPE mnt-by: ITGARDEN-MNT created: 2009-08-12T06,53,39Z last-modified: 2009-08-12T06,53,39Z source: RIPE route6: 2a01,4400,,/32 descr: It Garden i Landskrona AB origin: AS1257 notify: email@example.com notify: firstname.lastname@example.org mnt-by: AS1257-MNT created: 2012-07-31T13,06,34Z last-modified: 2012-07-31T13,06,34Z 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.