inet6num: 2a02,c40,,/29 netname: PL-LEON-20090325 country: pl org: ORG-LSzo6-RIPE admin-c: MK2139-RIPE admin-c: MM11992-RIPE tech-c: MK2139-RIPE tech-c: MM11992-RIPE status: ALLOCATED-BY-RIR notify: email@example.com mnt-by: RIPE-NCC-HM-MNT mnt-by: LEON-MNT mnt-lower: LEON-MNT mnt-routes: LEON-MNT created: 2012-07-10T11,34,54Z last-modified: 2016-08-10T17,30,06Z source: RIPE organisation: ORG-LSzo6-RIPE org-name: Leon Sp. z o.o. org-type: LIR address: ul. Kilinskiego 33d address: 44-200 address: Rybnik address: POLAND phone: +48324408000 fax-no: +48327557577 e-mail: firstname.lastname@example.org abuse-c: LSZO1-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: LEON-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: LEON-MNT created: 2009-03-25T13,08,47Z last-modified: 2016-08-10T17,30,15Z source: RIPE person: Marcin Kuczera address: Leon Sp. z o.o. address: ul. Kilinskiego 33D address: 44-200 Rybnik address: POLAND phone: +48327557575 nic-hdl: MK2139-RIPE mnt-by: LEON-MNT created: 2002-06-10T08,25,35Z last-modified: 2014-01-10T07,24,08Z source: RIPE person: Marcin Markowski address: Leon Sp. z o.o. address: ul. Kilinskiego 33D address: 44-200 Rybnik address: Poland phone: +48 32 7557575 fax-no: +48 32 7557577 nic-hdl: MM11992-RIPE mnt-by: LEON-MNT e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org created: 2005-10-26T21,10,24Z last-modified: 2013-01-04T18,19,37Z 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.