AS38004 FastLink Wireless ISP, DrukCom Pvt. Enterprise.
2401:5f40::/32 - FASTLINK
inet6num: 2401:5f40::/32 netname: FASTLINK descr: DrukCom Pvt. Enterprise, descr: 1 Norzin Lam, PO Box 810, Thimphu, descr: Bhutan, Internet country: BT org: ORG-FI5-AP admin-c: RD175-AP tech-c: RD175-AP mnt-routes: MAINT-BT-FASTLINK mnt-irt: IRT-FASTLINK-BT mnt-lower: MAINT-BT-FASTLINK mnt-by: APNIC-HM status: ALLOCATED PORTABLE last-modified: 2017-08-29T23:16:37Z source: APNIC irt: IRT-FASTLINK-BT address: DrukCom Pvt. Enterprise address: 1 Norzin Lam address: PO Box 180, Thimphu address: Bhutan e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org admin-c: RD175-AP tech-c: RD175-AP auth: # Filtered mnt-by: MAINT-BT-FASTLINK last-modified: 2013-07-29T11:26:53Z source: APNIC person: Rinzy Dorji nic-hdl: RD175-AP e-mail: email@example.com address: DrukCom Pvt. Enterprise address: 1 Norzin Lam address: PO Box 180, Thimphu address: Bhutan phone: +975-2332809 fax-no: +975-2332742 country: bt mnt-by: MAINT-NEW last-modified: 2008-09-04T07:29:24Z 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.