inet6num: 2a04,c180,,/29 netname: RO-OLTENIA-20150721 country: RO org: ORG-IOS6-RIPE admin-c: SI3199-RIPE tech-c: SI3199-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: OLTENIA-MNT mnt-routes: OLTENIA-MNT created: 2015-07-21T12,27,19Z last-modified: 2017-02-16T11,55,07Z source: RIPE organisation: ORG-IOS6-RIPE org-name: Internet Oltenia SRL org-type: LIR address: str. Calea Bucuresti Bl A23 ap12 address: 200523 address: Craiova address: ROMANIA e-mail: firstname.lastname@example.org admin-c: SI3199-RIPE tech-c: SI3199-RIPE abuse-c: AR32951-RIPE mnt-ref: OLTENIA-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: OLTENIA-MNT mnt-ref: RIPE-NCC-HM-MNT created: 2015-07-20T08,01,14Z last-modified: 2017-02-16T11,55,11Z source: RIPE phone: +40251419111 person: Sorin Istrate address: str. Calea Bucuresti Bl A23 ap12 address: 200523 address: Craiova address: ROMANIA phone: +40251419111 nic-hdl: SI3199-RIPE mnt-by: OLTENIA-MNT created: 2015-07-20T08,01,13Z last-modified: 2015-07-20T08,01,13Z source: RIPE route6: 2a04,c180,,/29 descr: Internet Oltenia origin: AS12842 mnt-by: OLTENIA-MNT created: 2015-08-20T12,53,20Z last-modified: 2015-08-20T12,53,20Z 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.