AS45609 Bharti Airtel Ltd. AS for GPRS Service
2401:4900:234c::/48 - SIRUSERI
inet6num: 2401:4900:234c::/64 netname: SIRUSERI descr: Bharti Airtel Limited, Plot No. F8, 1St Floor, SIPCOT IT Park, Siruseri, Padur Post,Kanchipuram - 603103 country: IN admin-c: RK250-AP tech-c: RK250-AP status: ASSIGNED NON-PORTABLE notify: firstname.lastname@example.org mnt-by: MAINT-IN-MOBILITY mnt-lower: MAINT-IN-MOBILITY mnt-routes: MAINT-IN-MOBILITY mnt-irt: IRT-BHARTI-MO-IN last-modified: 2019-03-07T10:07:19Z 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.