2404:f080::/32 - RUNSYSTEM-VN
inet6num: 2404:f080::/32 netname: RUNSYSTEM-VN descr: GMO-Z.com Runsystem Joint Stock Company descr: 6th Floor, Ocean Park Tower, No 1 Dao Duy Anh Street, Dong Da disstrict, Ha Noi City admin-c: PTH11-AP tech-c: NAT8-AP remarks: send spam and abuse report to firstname.lastname@example.org country: VN mnt-by: MAINT-VN-VNNIC mnt-lower: MAINT-VN-VNNIC mnt-irt: IRT-VNNIC-AP status: ALLOCATED PORTABLE last-modified: 2018-07-31T03:59:33Z 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.