AS132040 Citylink Ltd
2001:4410:1000::/40 - CITYLINKV6-20050602
inet6num: 2001:4410::/32 netname: CITYLINKV6-20050602 descr: CityLink descr: PO Box 9328 descr: Wellington country: NZ org: ORG-CL4-AP admin-c: CRA1-AP tech-c: CRA1-AP status: ALLOCATED PORTABLE mnt-by: APNIC-HM mnt-lower: MAINT-NZ-CITYLINK mnt-irt: IRT-CITYLINK-NZ last-modified: 2017-08-29T23:07:46Z source: APNIC
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.