inet6num: 2405:b300::/32 netname: CYPRESSTEL descr: CYPRESS TELECOM (CHINA) LIMITED descr: Room 809B, 8/F, Modern International Building, descr: No.3038 Jintian Road descr: Futian CBD, Shenzhen, Guangdong China country: CN admin-c: LX2386-AP tech-c: YG790-AP mnt-by: MAINT-CNNIC-AP mnt-lower: MAINT-CNNIC-AP mnt-routes: MAINT-CNNIC-AP mnt-irt: IRT-CNNIC-CN status: ALLOCATED PORTABLE last-modified: 2012-11-16T00:01:16Z 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.