inet6num: 2a02:2248:6553::/64 netname: BG-GCN-20151012 descr: GCN's GGC infrastructure country: BG admin-c: VIV30-RIPE tech-c: VIV30-RIPE status: ASSIGNED mnt-by: GCN-LIR-MNT created: 2015-10-12T19:37:11Z last-modified: 2018-03-07T09:34:38Z source: RIPE person: Venko Velev address: Bulgaria, Sofia address: Slivnitza 245 bld. phone: +359882960009 phone: +35924200555 e-mail: email@example.com nic-hdl: VIV30-RIPE mnt-by: GCN-LIR-MNT created: 2013-11-08T10:00:37Z last-modified: 2013-11-08T10:00:37Z source: RIPE route6: 2a02:2248:6553::/64 descr: GCN's GGC infrastructure origin: AS12615 mnt-by: GCN-LIR-MNT created: 2015-10-12T19:32:08Z last-modified: 2015-10-12T19:32:08Z 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.