inet6num: 2001,67c,24cc,,/48 netname: PW-NET descr: Warsaw University of Technology country: PL org: ORG-PW9-RIPE admin-c: TR2080-RIPE tech-c: PJ1343-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: AS12464-MNT mnt-routes: AS12464-MNT mnt-domains: AS12464-MNT created: 2011-10-05T15,04,51Z last-modified: 2016-04-14T09,52,44Z source: RIPE sponsoring-org: ORG-NRaA1-RIPE organisation: ORG-PW9-RIPE org-name: Politechnika Warszawska org-type: OTHER address: Plac Politecniki 1, 00-661 Warszawa e-mail: firstname.lastname@example.org mnt-ref: AS12464-MNT mnt-by: AS12464-MNT abuse-c: PW3686-RIPE created: 2011-10-03T06,17,51Z last-modified: 2014-10-04T20,20,19Z source: RIPE person: Piotr Jankowski address: Politechnika Waszawska address: 00-661 Warszawa address: Plac Politechniki 1 phone: +48 22 2345388 fax-no: +48 22 6218657 e-mail: P.Jankowski@coi.pw.edu.pl nic-hdl: PJ1343-RIPE abuse-mailbox: email@example.com created: 1970-01-01T00,00,00Z last-modified: 2013-01-17T19,51,56Z source: RIPE mnt-by: AS12464-MNT person: Tadeusz Rogowski address: Politechnika Waszawska address: 00-661 Warszawa address: Plac Politechniki 1 abuse-mailbox: firstname.lastname@example.org phone: +48 22 2345392 fax-no: +48 22 6218657 e-mail: T.Rogowski@coi.pw.edu.pl nic-hdl: TR2080-RIPE notify: email@example.com created: 1970-01-01T00,00,00Z last-modified: 2013-01-17T19,53,34Z source: RIPE mnt-by: AS12464-MNT route6: 2001,67c,24cc,,/48 descr: Politechnika Warszawska origin: AS12464 mnt-by: AS12464-MNT created: 2011-10-19T14,49,14Z last-modified: 2011-10-19T14,49,14Z 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.