AS10091 StarHub Ltd
2404:e800:103::/48 - SGCABLEVISION-SG-20110909
inet6num: 2404:e800::/31 netname: SGCABLEVISION-SG-20110909 descr: StarHub Cable Vision Ltd country: SG org: ORG-SCVL1-AP admin-c: ACS7-AP tech-c: ACS7-AP mnt-by: APNIC-HM mnt-routes: MAINT-SG-SCV mnt-lower: MAINT-SG-SCV mnt-irt: IRT-SGCABLEVISION-SG status: ALLOCATED PORTABLE last-modified: 2017-08-29T23:03:10Z 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.