inet6num: 2a02,214d,8000,,/33 netname: IPV6-RESIDENTIAL-CUSTOMERS-ATH descr: IPV6 ADDRESS SPACE FOR RESIDENTIAL ATH CUSTOMERS country: GR admin-c: FARO1-RIPE tech-c: FTO1-RIPE status: ALLOCATED-BY-LIR mnt-by: FORTHNETGR-MNT created: 2016-06-17T06,11,43Z last-modified: 2016-06-17T06,11,43Z source: RIPE role: Forthnet Administrative Role address: 58, Antigonis Str address: 104 42, ATHENS address: GR phone: +30 2119557000 fax-no: +30 2119557222 e-mail: firstname.lastname@example.org abuse-mailbox: email@example.com admin-c: CK4191-RIPE tech-c: FTO1-RIPE nic-hdl: FARO1-RIPE mnt-by: FORTHNETGR-MNT created: 2011-05-03T09,51,08Z last-modified: 2013-12-20T09,45,56Z source: RIPE role: Forthnet Technical Operations address: 58, Antigonis Str address: 104 42, ATHENS address: GR e-mail: firstname.lastname@example.org phone: +30 2119557000 fax-no: +30 2119557222 admin-c: FARO1-RIPE tech-c: DK637-RIPE tech-c: KG290-RIPE tech-c: VB3058-RIPE nic-hdl: FTO1-RIPE mnt-by: FORTHNETGR-MNT notify: email@example.com created: 1970-01-01T00,00,00Z last-modified: 2016-11-01T07,58,58Z source: RIPE abuse-mailbox: firstname.lastname@example.org route6: 2a02,214d,8000,,/33 descr: FORTHNET-AS1241-IPv6-ADDRESS-BLOCK origin: AS1241 mnt-by: FORTHNETGR-MNT created: 2014-09-17T10,17,36Z last-modified: 2014-09-17T10,17,36Z 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.