inet6num: 2001,4b00,,/29 netname: CH-TICINOCOM-20041202 country: CH org: ORG-IL3-RIPE admin-c: TCOM-RIPE tech-c: TCOM-RIPE status: ALLOCATED-BY-RIR notify: firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-by: TICINOCOM-MNT mnt-lower: TICINOCOM-MNT mnt-routes: TICINOCOM-MNT mnt-domains: TICINOCOM-MNT created: 2013-01-02T13,05,36Z last-modified: 2016-08-09T13,37,03Z source: RIPE organisation: ORG-IL3-RIPE org-name: Ticinocom SA org-type: LIR address: Via Stazione 5 address: 6600 address: Locarno-Muralto address: SWITZERLAND phone: +41912200000 fax-no: +41912200010 e-mail: email@example.com admin-c: KHF2-RIPE tech-c: TCOM-RIPE abuse-c: TCOM-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: TICINOCOM-MNT notify: firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-by: TICINOCOM-MNT created: 2004-04-17T11,02,32Z last-modified: 2016-09-02T14,05,50Z source: RIPE role: Ticinocom SA address: Ticinocom SA address: Via Stazione 5 address: CH-6600 Muralto address: Switzerland org: ORG-IL3-RIPE phone: +41 91 22 00 000 fax-no: +41 91 22 00 010 e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org remarks: ======================================================== remarks: Spam and abuse issues , email@example.com remarks: ======================================================== admin-c: KHF2-RIPE tech-c: KHF2-RIPE nic-hdl: TCOM-RIPE mnt-by: TICINOCOM-MNT created: 2011-05-04T07,58,52Z last-modified: 2014-02-24T09,14,50Z source: RIPE route6: 2001,4b00,,/29 descr: Ticinocom SA origin: AS12620 mnt-by: TICINOCOM-MNT created: 2013-01-02T14,24,01Z last-modified: 2013-01-02T14,24,01Z 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.