2001:4020::/32 - PL-ICP-20040624
inet6num: 2001:4020::/32 netname: PL-ICP-20040624 country: PL org: ORG-IICP1-RIPE admin-c: INEA-RIPE tech-c: INEA-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: INEA-MNT mnt-lower: ICP-MNT mnt-lower: INEA-MNT mnt-routes: ICP-MNT mnt-routes: INEA-MNT mnt-domains: ICP-MNT mnt-domains: INEA-MNT notify: firstname.lastname@example.org created: 2004-06-24T09:21:06Z last-modified: 2018-07-12T23:10:59Z source: RIPE organisation: ORG-IICP1-RIPE org-name: INEA S.A. org-type: LIR address: ul. Klaudyny Potockiej 25 address: 60-211 address: Poznan address: POLAND phone: +48612222222 fax-no: +48612221241 mnt-ref: ICP-MNT mnt-ref: INEA-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: INEA-MNT admin-c: PSZY admin-c: PA7317-RIPE abuse-c: IAT31-RIPE created: 2004-04-17T11:47:18Z last-modified: 2018-07-12T23:11:03Z source: RIPE e-mail: email@example.com role: INEA S.A. address: ul. Klaudyny Potockiej 25 address: 60-211 Poznan notify: firstname.lastname@example.org e-mail: email@example.com nic-hdl: INEA-RIPE mnt-by: INEA-MNT admin-c: PA7317-RIPE tech-c: PA7317-RIPE tech-c: PSZY created: 2014-07-14T09:26:21Z last-modified: 2015-01-21T10:25:56Z source: RIPE route6: 2001:4020::/32 descr: INEA S.A. descr: Poznan origin: AS13110 mnt-by: INEA-MNT created: 2012-06-01T11:55:12Z last-modified: 2015-01-27T10:14:29Z 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.