2a00:4800:a0::/44 - BG-MTELNET-20101208
inet6num: 2a00:4800::/29 netname: BG-MTELNET-20101208 country: BG org: ORG-MN1-RIPE admin-c: GG15027-RIPE tech-c: GG15027-RIPE status: ALLOCATED-BY-RIR notify: firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-by: AS12716-MNT created: 2014-02-20T13:32:59Z last-modified: 2017-11-08T10:11:13Z source: RIPE organisation: ORG-MN1-RIPE org-name: A1 Bulgaria EAD org-type: LIR address: 1 Kukush Str. address: 1309 address: Sofia address: BULGARIA phone: +359 88 8088088 phone: +35 988 1010 fax-no: +359 88 110 3970 e-mail: email@example.com abuse-c: AR14215-RIPE admin-c: GG15027-RIPE admin-c: BH3761-RIPE admin-c: MG14247-RIPE mnt-ref: AS12716-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: AS12716-MNT created: 2004-04-17T11:01:14Z last-modified: 2018-09-13T11:11:28Z source: RIPE person: Georgi Gaydarov address: Sofia kukush1 phone: +359888088088 nic-hdl: GG15027-RIPE mnt-by: SPNET-MNT created: 2015-12-14T09:16:03Z last-modified: 2017-05-02T06:18:13Z source: RIPE route6: 2a00:4800::/29 descr: Blizoo origin: AS13124 mnt-by: AS13124-MNT created: 2014-02-28T14:12:24Z last-modified: 2014-02-28T14:12:24Z 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.