AS133798 PT. Smartfren Telecom, Tbk
2402:5680:4400::/38 - SMARTFREN-ID
inet6num: 2402:5680::/32 netname: SMARTFREN-ID descr: PT. SMARTFREN TELECOM descr: Internet Service Provider descr: Jl. Pahlawan Seribu Lot 12A descr: CBD BSD, Serpong descr: Tangerang Selatan 15321 admin-c: KU33-AP tech-c: MIB2-AP country: ID mnt-by: MNT-APJII-ID mnt-lower: MAINT-ID-SMARTFREN mnt-irt: IRT-SMARTFREN-ID mnt-routes: MAINT-ID-SMARTFREN status: ALLOCATED PORTABLE last-modified: 2015-05-13T04:56:53Z 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.