Government revenues largely come from sales of fishing licences, income from the Tuvalu Trust Fund, and from the lease of its ".tv" Internet Top Level Domain (TLD). In 1998, Tuvalu began deriving revenue from the use of its area code for premium-rate telephone numbers and from the commercialisation of its ".tv" Internet domain name, which is now managed by Verisign until 2021. Tuvalu also generates income from postage stamps by the Tuvalu Philatelic Bureau, and from the Tuvalu Ship Registry.