inet6num: 2001,67c,28c4,,/48 netname: SE-KEMINSIPv6 country: SE org: ORG-KEMI1-RIPE admin-c: PL2352-RIPE tech-c: PL2352-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: RESILANS-MNT mnt-domains: RESILANS-MNT mnt-routes: DGCSYSTEMS-MNT created: 2012-05-18T09,14,11Z last-modified: 2016-04-14T10,15,14Z source: RIPE sponsoring-org: ORG-RESI1-RIPE organisation: ORG-KEMI1-RIPE org-name: Kemikalieinspektionen org-type: OTHER abuse-c: ABUS2121-RIPE address: Kemikalieinspektionen address: Box 2 address: SE-171 13 Sundbyberg address: Sweden e-mail: firstname.lastname@example.org admin-c: PL2352-RIPE mnt-by: RESILANS-MNT mnt-ref: RESILANS-MNT created: 2012-03-30T11,38,13Z last-modified: 2014-04-16T09,03,02Z source: RIPE person: Peter Linden address: Kemikalieinspektionen address: Box 2 address: S-172 13 Sundyberg address: Sweden phone: +46 8 51941100 fax-no: +46 8 7357698 e-mail: email@example.com nic-hdl: PL2352-RIPE mnt-by: RESILANS-MNT created: 2005-03-21T12,08,53Z last-modified: 2008-02-14T18,55,35Z source: RIPE route6: 2001,67c,28c4,,/48 descr: Kemikalieinspektionen origin: AS21195 mnt-by: DGCSYSTEMS-MNT created: 2013-07-11T16,43,34Z last-modified: 2013-07-11T16,43,34Z 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.