inet6num: 2001,67c,448,,/48 netname: UPPLANDS-VASBY-KOMMUN-NET country: SE org: ORG-UVK1-RIPE sponsoring-org: ORG-TA44-RIPE admin-c: MW2589-RIPE tech-c: PM5377-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: SWIPNET-LIR-MNT mnt-routes: SWIPNET-LIR-MNT mnt-domains: SWIPNET-LIR-MNT notify: firstname.lastname@example.org created: 2014-02-19T06,49,00Z last-modified: 2016-11-08T11,42,03Z source: RIPE organisation: ORG-UVK1-RIPE org-name: Upplands Vasby Kommun org-type: OTHER address: Dragonvagen 86 address: S-194 80 UPPLANDS VASBY address: SE phone: +46 8 590 970 00 fax-no: +46 8 590 733 40 e-mail: email@example.com abuse-c: AR18475-RIPE mnt-ref: DGCSYSTEMS-MNT mnt-by: DGCSYSTEMS-MNT abuse-mailbox: firstname.lastname@example.org created: 2005-02-10T13,07,24Z last-modified: 2014-02-21T08,17,19Z source: RIPE person: Magnus Walldie address: Upplands Vasby Kommun address: Dragonvagen 86 address: S-194 80 UPPLANDS VASBY address: SE e-mail: email@example.com phone: +46 8 590 87 815 fax-no: +46 8 590 89 876 mnt-by: DGCSYSTEMS-MNT nic-hdl: MW2589-RIPE created: 2005-02-09T15,38,16Z last-modified: 2005-02-09T15,38,16Z source: RIPE person: Peter Mwaka address: Upplands Vasby Kommun address: Dragonvagen 86 address: S-194 80 UPPLANDS VASBY address: SE e-mail: firstname.lastname@example.org phone: +46 8 590 97 861 fax-no: +46 8 590 89 876 mnt-by: DGCSYSTEMS-MNT nic-hdl: PM5377-RIPE created: 2005-02-09T15,27,56Z last-modified: 2005-02-09T15,27,56Z source: RIPE route6: 2001,67c,448,,/48 descr: Upplands Vasby kommun descr: TELE2 In case of improper use originating from our network, please mail or origin: AS1257 notify: email@example.com notify: firstname.lastname@example.org mnt-by: AS1257-MNT created: 2016-11-08T11,43,09Z last-modified: 2016-11-08T11,43,09Z 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.