inet6num: 2a00,fa00,,/32 netname: PT-JAZZTEL-20110128 country: PT org: ORG-JPSd1-RIPE admin-c: ATNO2-RIPE tech-c: ATNO2-RIPE status: ALLOCATED-BY-RIR notify: email@example.com mnt-by: RIPE-NCC-HM-MNT mnt-by: AS12926-MNT mnt-lower: AS12926-MNT mnt-routes: AS12926-MNT created: 2011-01-28T09,12,44Z last-modified: 2016-07-26T14,45,28Z source: RIPE organisation: ORG-JPSd1-RIPE org-name: AR TELECOM - Acessos e Redes de Telecomunicacoes, S.A. org-type: LIR address: Edificio Diogo Cao - Doca de Alcantara address: 1350-352 address: LISBOA address: PORTUGAL phone: +351210301030 fax-no: +351210301300 e-mail: firstname.lastname@example.org admin-c: ATNO2-RIPE admin-c: NMA35-RIPE admin-c: RMS145-RIPE admin-c: JMC69-RIPE abuse-c: ATAC4-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: AS12926-MNT abuse-mailbox: email@example.com mnt-by: RIPE-NCC-HM-MNT mnt-by: AS12926-MNT created: 2004-04-17T11,49,06Z last-modified: 2016-07-26T14,45,26Z source: RIPE role: Ar Telecom Network Operation Center address: Edificio Diogo Cao e-mail: firstname.lastname@example.org mnt-by: JAZZ-MNT admin-c: NMA35-RIPE tech-c: JMC69-RIPE tech-c: NMA35-RIPE tech-c: RMS145-RIPE nic-hdl: ATNO2-RIPE created: 2005-10-28T15,31,19Z last-modified: 2016-01-04T14,22,36Z source: RIPE route6: 2a00,fa00,,/32 descr: Ar Telecom, Acessos e Redes Telecomunicacoes. S.A. origin: AS12926 mnt-by: AS12926-MNT created: 2015-05-06T14,14,18Z last-modified: 2015-05-06T14,14,18Z 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.