The sites — which require payments for the bogus tips — turn up then disappear almost as soon as they’re spotted, according to Hong Kong Jockey Club spokesman Wilson Cheng.
The club is a nonprofit charity that runs Hong Kong’s lottery, horse races and football betting.
Hong Kong lottery officials claim there’s no way anyone can have “inside” information on which winning numbers will be chosen in the random drawings.
Top prizes run into the hundreds of thousands of US dollars, and sometimes more.
The South China Morning Post newspaper reported Monday that one site was offering memberships for between 4,800 yuan and 8,800 yuan, and promising to provide members with winning numbers for the next draw.
The site was no longer available when The Associated Press tried to enter it on Monday.
“These fake websites have been surfacing for nearly a year,” Cheng said. “We’ve had 50 or 60 such cases. They live for a very, very short time period … so nobody can trace them.”
Lottery officials file complaints with mainland and Taiwanese authorities whenever they learn of a new site, but Cheng does not believe there have been any arrests. He said the Jockey Club has also taken out newspaper ads to warn the public.