AS15169 Google LLC
2404:6800:4005::/48 - GOOGLE_IPV6_AP-20080930
inet6num: 2404:6800::/32 netname: GOOGLE_IPV6_AP-20080930 descr: Google IPv6 address block in AP country: AU org: ORG-GIL3-AP admin-c: JC2459-AP tech-c: JC2459-AP mnt-by: APNIC-HM mnt-lower: MAINT-GOOGLE-AP mnt-routes: MAINT-GOOGLE-AP status: ALLOCATED PORTABLE mnt-irt: IRT-GOOGLE-AP last-modified: 2017-09-26T23:30:12Z 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.