Originally the company targeted just corporate customers, but from 1 December 1998, when the Irish telecommunications market was fully deregulated, domestic customers were also targeted, under the "Esat Clear" brand name. 1,300 customers signed up before it had even launched. In 1999, Esat entered the Internet service provider market, initially through the purchase of EUnet Ireland, which became Esat Net. However, it was the acquisition of Ireland On-Line from An Post that year which made Esat the biggest ISP in the country for a time. Also in 1999, Esat bid for Cablelink Limited, the cable and television company owned jointly by Telecom Éireann and RTÉ. However, NTL won.