inet6num: 2001,7f8,2a,,/48 netname: CATNIX-20040702 remarks: CATalunya Neutral Internet eXchange country: ES org: ORG-CdSd1-RIPE admin-c: MH3879-RIPE tech-c: CNOC6-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-lower: RIPE-NCC-END-MNT mnt-by: CESCA-MNT mnt-routes: CESCA-MNT mnt-domains: CESCA-MNT notify: firstname.lastname@example.org created: 2004-07-02T11,42,19Z last-modified: 2016-04-14T10,54,12Z source: RIPE organisation: ORG-CdSd1-RIPE org-name: Consorci de Serveis Universitaris de Catalunya org-type: LIR address: Edifici Nexus Gran Capita 2 address: E-08034 address: Barcelona address: SPAIN phone: +34932056464 fax-no: +34932056979 e-mail: email@example.com admin-c: MH3879-RIPE admin-c: MIGC1-RIPE admin-c: CPC1-RIPE tech-c: CNOC6-RIPE abuse-c: CNOC6-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: CESCA-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: CESCA-MNT created: 2004-04-17T11,16,24Z last-modified: 2016-05-18T16,36,26Z source: RIPE role: CESCA Network Operation Center address: CSUC address: Edifici Nexus address: Gran Capita, 2-4 address: E-08034 Barcelona address: SPAIN phone: +34 93 2056464 fax-no: +34 93 2056979 e-mail: firstname.lastname@example.org admin-c: MH3879-RIPE admin-c: CPC1-RIPE tech-c: MIGC1-RIPE tech-c: FBA10-RIPE tech-c: MPE14-RIPE tech-c: EJS36-RIPE nic-hdl: CNOC6-RIPE abuse-mailbox: email@example.com notify: firstname.lastname@example.org mnt-by: CESCA-MNT created: 2004-04-06T11,59,13Z last-modified: 2015-12-29T10,17,10Z source: RIPE person: Miguel Huguet address: CSUC address: Edifici Nexus address: Gran Capita, 2-4 address: E-08034 Barcelona address: SPAIN phone: +34 93 2056464 fax-no: +34 93 2056979 e-mail: email@example.com nic-hdl: MH3879-RIPE notify: firstname.lastname@example.org mnt-by: CESCA-MNT created: 1970-01-01T00,00,00Z last-modified: 2014-10-17T08,51,09Z source: RIPE route6: 2001,7f8,2a,,/48 descr: CATNIX Catalonia Internet Exchange origin: AS13041 notify: email@example.com mnt-by: CESCA-MNT created: 2010-03-17T14,21,12Z last-modified: 2011-04-29T07,35,58Z 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.