2a03:1380::/32 - PL-UMK-20110811
inet6num: 2a03,1380,,/32 netname: PL-UMK-20110811 country: PL org: ORG-NCUi1-RIPE admin-c: KK8208-RIPE tech-c: TMAN-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-lower: TORMAN-MNT mnt-routes: TORMAN-MNT notify: firstname.lastname@example.org created: 2011-08-11T13,45,50Z last-modified: 2016-04-14T09,42,32Z source: RIPE organisation: ORG-NCUi1-RIPE org-name: Nicolaus Copernicus University in Torun org-type: LIR address: Pl. Rapackiego 1 address: 87-100 address: Torun address: POLAND phone: +48566112750 fax-no: +48566221850 e-mail: email@example.com mnt-ref: RIPE-NCC-HM-MNT mnt-ref: TORMAN-MNT mnt-by: RIPE-NCC-HM-MNT admin-c: KK8208-RIPE abuse-c: TMAN-RIPE created: 2011-04-11T09,24,33Z last-modified: 2015-12-18T07,40,43Z source: RIPE role: TORMAN NOC address: Nicolaus Copernicus University in Torun address: Information and Communication Technology Centre address: Metropolitan Area Network TORMAN NOC address: Pl. Rapackiego 1 address: 87-100 Torun address: POLAND e-mail: firstname.lastname@example.org abuse-mailbox: email@example.com phone: +48 56 611 27 60 fax-no: +48 56 622 18 50 admin-c: KK8208-RIPE tech-c: KK8208-RIPE tech-c: KK3578-RIPE nic-hdl: TMAN-RIPE mnt-by: TORMAN-MNT created: 2011-07-04T09,10,54Z last-modified: 2011-09-13T13,20,49Z source: RIPE person: Kamil Ksiadz address: Nicolaus Copernicus University in Torun address: Information and Communication Technology Centre address: Metropolitan Area Network TORMAN address: Pl. Rapackiego 1 address: 87-100 Torun address: POLAND phone: +48 56 611 27 60 fax-no: +48 56 622 18 50 e-mail: firstname.lastname@example.org abuse-mailbox: email@example.com mnt-by: TORMAN-MNT nic-hdl: KK8208-RIPE created: 2009-03-12T14,08,18Z last-modified: 2011-07-04T09,42,44Z source: RIPE route6: 2a03,1380,,/32 descr: TORMAN IPv6 origin: AS12423 mnt-by: TORMAN-MNT created: 2011-09-15T10,54,20Z last-modified: 2011-09-15T10,54,20Z 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.