inet6num: 2a03,db80,3410,,/48 netname: Fraunhofer-IGD-Main-Site-Intranet descr: Fraunhofer IGD Main Site Intranet country: DE admin-c: FHG20-RIPE tech-c: FHG20-RIPE status: ASSIGNED mnt-by: MNT-FHG-LIR mnt-routes: AS12643-MNT created: 2012-05-06T11,22,31Z last-modified: 2012-07-17T13,59,34Z source: RIPE role: FHG LIR ROLE address: Fraunhofer Institut fuer Optronik, Systemtechnik und Bildauswertung IOSB e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org admin-c: HS5806-RIPE tech-c: HS5806-RIPE nic-hdl: FHG20-RIPE mnt-by: MNT-FHG-LIR created: 2012-05-06T10,25,23Z last-modified: 2013-04-29T17,24,56Z source: RIPE route6: 2a03,db80,3410,,/48 descr: Fraunhofer IGD origin: AS12643 mnt-lower: AS12643-MNT mnt-routes: AS12643-MNT mnt-by: AS12643-MNT created: 2012-07-18T07,32,23Z last-modified: 2012-07-18T07,33,26Z 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.