inet6num: 2403:8600::/32 netname: TTSLISP descr: Tata Teleservices ISP country: IN org: ORG-TD1-AP admin-c: TTLC1-AP tech-c: TTLC1-AP mnt-lower: MAINT-IN-TTSLMEIS mnt-routes: MAINT-IN-TTSLMEIS mnt-by: APNIC-HM status: ALLOCATED PORTABLE mnt-irt: IRT-TTSLMEIS-IN last-modified: 2017-08-29T22:59:47Z 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.