inet6num: 2a02,ba0,,/32 netname: IL-IPPLANET-20090318 country: IL org: ORG-IPNL1-RIPE admin-c: TECH6-RIPE tech-c: TECH6-RIPE status: ALLOCATED-BY-RIR remarks: Please send abuse notifications to firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-lower: AS12491-MNT mnt-routes: AS12491-MNT notify: email@example.com created: 2009-03-18T10,18,37Z last-modified: 2016-04-14T08,21,13Z source: RIPE organisation: ORG-IPNL1-RIPE org-name: Gilat Satcom org-type: LIR address: 21 Yegia Kapayim St. address: 49130 address: Petach-Tikva address: ISRAEL phone: +97239255055 fax-no: +97239217938 e-mail: firstname.lastname@example.org abuse-c: AR15570-RIPE abuse-mailbox: email@example.com admin-c: VT3361-RIPE admin-c: EB10760-RIPE admin-c: AH2932-RIPE mnt-ref: AS12491-MNT mnt-ref: RIPE-NCC-HM-MNT notify: firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT created: 2004-04-17T11,27,43Z last-modified: 2016-07-28T08,16,51Z source: RIPE person: Tech IP Planet address: 21 Yegia Kapaim St. Petach-Tikva, Israel phone: +972 3 9255015 e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org nic-hdl: TECH6-RIPE notify: email@example.com mnt-by: AS12491-MNT created: 2004-04-29T09,43,08Z last-modified: 2009-08-17T06,30,13Z 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.