2a04:9e40::/29 - UK-DXNETWORKS-20140109
inet6num: 2a04,9e40,,/29 netname: UK-DXNETWORKS-20140109 country: GB org: ORG-DNL3-RIPE admin-c: SDX-RIPE tech-c: SDX-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: DXNET-MNT mnt-routes: DXNET-MNT notify: firstname.lastname@example.org created: 2014-01-09T09,41,47Z last-modified: 2017-04-19T09,24,23Z source: RIPE organisation: ORG-DNL3-RIPE org-name: Dexterity Networks Limited org-type: LIR address: 91 Ellesborough Road address: Wendover address: HP22 6ES address: UNITED KINGDOM phone: +441296623318 fax-no: +441296622829 e-mail: email@example.com mnt-ref: dxNET-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: DXNET-MNT admin-c: SDX-RIPE admin-c: SS10967-RIPE abuse-c: DNAC1-RIPE created: 2008-10-09T14,01,17Z last-modified: 2017-04-19T09,25,22Z source: RIPE person: Sam Barham address: Barclays House address: Gatehouse Way address: Aylesbury address: Bucks address: HP19 8DB phone: +441296343430 nic-hdl: SDX-RIPE mnt-by: DXNET-MNT created: 2009-01-12T21,33,05Z last-modified: 2012-11-19T23,05,44Z source: RIPE route6: 2a04,9e40,,/29 descr: DX Networks origin: AS12658 mnt-by: DXNET-MNT created: 2015-11-05T15,29,09Z last-modified: 2015-11-05T15,29,09Z 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.