inet6num: 2a01,4400,2,,/48 netname: SE-TPNETWORK-IPV6 descr: TP Network IPv6 assignment country: SE admin-c: ANPA1-RIPE admin-c: JOTI2-RIPE tech-c: ANPA1-RIPE tech-c: JOTI2-RIPE status: ASSIGNED mnt-by: ITGARDEN-MNT created: 2012-02-29T16,22,02Z last-modified: 2012-02-29T16,22,02Z source: RIPE person: Andreas Paulsson address: IT Garden i Landskrona AB address: Orja Skolvag 15 address: 261 91 Landskrona address: Sweden phone: +46 418 769 12 fax-no: +46 418 769 29 e-mail: firstname.lastname@example.org nic-hdl: ANPA1-RIPE mnt-by: ITGARDEN-MNT created: 2009-07-14T12,15,49Z last-modified: 2009-08-12T06,48,00Z source: RIPE person: Jonas Tillberg address: IT Garden i Landskrona AB address: Orja Skolvag 15 address: 261 91 Landskrona address: Sweden phone: +46 418 769 16 fax-no: +46 418 769 29 e-mail: email@example.com nic-hdl: JOTI2-RIPE mnt-by: ITGARDEN-MNT created: 2010-05-19T18,06,48Z last-modified: 2010-05-19T18,06,48Z source: RIPE route6: 2a01,4400,,/32 descr: It Garden i Landskrona AB origin: AS1257 notify: firstname.lastname@example.org notify: email@example.com mnt-by: AS1257-MNT created: 2012-07-31T13,06,34Z last-modified: 2012-07-31T13,06,34Z 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.