2404:b680::/32 - SAN-TH
inet6num: 2404:b680::/32 netname: SAN-TH descr: Server & Networking Co.,Ltd. country: TH org: ORG-SNC1-AP admin-c: SNCA1-AP tech-c: SNCA1-AP mnt-routes: MAINT-SAN-TH mnt-irt: IRT-SAN-TH mnt-lower: MAINT-SAN-TH mnt-by: APNIC-HM status: ALLOCATED PORTABLE last-modified: 2018-09-14T05:15:24Z 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.