The sex.com domain name has been sold for $13m (£8.2m), according to court documents filed in California.
The domain, thought to be the most expensive in the world, was put on sale earlier this year by its bankrupt owner Escom, and has been bought by Clover Holdings, based in the Caribbean island of St Vincent.
Escom bought sex.com for $12m, plus $2m in stock and other options, in 2006 from Gary Kremen.
"Possibly the most interesting thing is that the domain has gone up in price by only $1m [£633m] in nearly five years," said Kieren McCarthy, author of the book Sex.com, in a blog post.
"Does this mean that Gary Kremen got a great price back in 2006? Does it mean that the value of dotcoms, even sex.com, is stabilising?
"Or does it mean that the buyers kept Escom down to the original price because they knew Escom had no real choice? My feeling is a bit of all of them, but mainly the last one."
Twelve companies entered bids for the domain name, which is estimated to bring in around $1m a month in advertising, before Clover Holdings clinched the deal.
"The proposed sale was the product of arms length, good faith negotiations in which the debtor bargained for maximum possible purchase price for the assets," Escom attorney Jeffrey Dulberg wrote in a court filing.
"The negotiations involved substantial time and effort by the parties, and [the agreement] reflects give-and-take and compromises by both sides."
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