2a0b:3100::/40 - NL-ROOTNET-20161014
inet6num: 2a0b,3100,,/29 netname: NL-ROOTNET-20161014 country: NL org: ORG-RNB4-RIPE admin-c: CDC484-RIPE tech-c: CDC484-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: nl-rootnet-1-mnt created: 2016-10-14T10,15,36Z last-modified: 2016-10-14T10,15,36Z source: RIPE organisation: ORG-RNB4-RIPE org-name: Rootnet NOC B.V. org-type: LIR address: Kerkenbos 1059 address: 6546 BB address: Nijmegen address: NETHERLANDS e-mail: email@example.com admin-c: CDC484-RIPE admin-c: EW1759-RIPE tech-c: CDC484-RIPE tech-c: EW1759-RIPE abuse-c: AR37945-RIPE mnt-ref: nl-rootnet-1-mnt mnt-by: RIPE-NCC-HM-MNT mnt-by: nl-rootnet-1-mnt created: 2016-10-13T13,23,45Z last-modified: 2016-10-13T13,24,06Z source: RIPE phone: +31 24 3500112 person: Colin du Croix address: Kerkenbos 1059 address: 6546 BB address: Nijmegen address: NETHERLANDS phone: +31 24 3500112 nic-hdl: CDC484-RIPE mnt-by: nl-rootnet-1-mnt created: 2016-10-13T13,23,44Z last-modified: 2016-10-13T13,23,45Z 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.