inet6num: 2001,818,,/29 netname: PT-TELECEL-20020711 country: PT org: ORG-VTCP1-RIPE admin-c: VTIM1-RIPE tech-c: VTIM1-RIPE status: ALLOCATED-BY-RIR notify: firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-by: AS12353-MNT mnt-lower: AS12353-MNT mnt-routes: AS12353-MNT created: 2013-06-11T15,23,30Z last-modified: 2016-06-02T09,35,51Z source: RIPE organisation: ORG-VTCP1-RIPE org-name: Vodafone Portugal - Communicacoes Pessoais S.A. org-type: LIR address: Alameda dos Oceanos - Lote 1.01.01, Parque das Nações Fracção S700 - Ala Sul - Stª Maria dos Olivais address: 1990-093 address: LISBOA address: PORTUGAL phone: +351919508824 fax-no: +351210915882 e-mail: email@example.com admin-c: CS2999-RIPE admin-c: LF1645-RIPE admin-c: AA2301-RIPE abuse-c: VTIM1-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: AS12353-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: AS12353-MNT created: 2004-04-17T11,49,25Z last-modified: 2016-07-21T13,43,22Z source: RIPE role: Vodafone Portugal IP Management address: Edificio da Vodafone address: Av. D. Joao II, Lote 1.04.01, address: Ala sul, 7o, Fraccao S701 address: Parque das Nacoes address: 1990-093 LISBOA address: PORTUGAL fax-no: +351 21 0915882 e-mail: firstname.lastname@example.org remarks: trouble, Abuse and SPAM reports, remarks: trouble, email@example.com remarks: Abuse and SPAM reports, remarks: firstname.lastname@example.org admin-c: CS2999-RIPE tech-c: AA2301-RIPE tech-c: LF1645-RIPE tech-c: VC1076-RIPE nic-hdl: VTIM1-RIPE mnt-by: AS12353-MNT created: 2003-01-06T12,02,06Z last-modified: 2012-05-16T13,23,33Z source: RIPE abuse-mailbox: email@example.com route6: 2001,818,,/29 descr: Vodafone Portugal mnt-lower: AS12353-MNT mnt-routes: AS12353-MNT origin: AS12353 mnt-by: AS12353-MNT created: 2013-06-17T14,53,42Z last-modified: 2013-06-17T14,53,42Z 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.