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Google Inc. will be placing a detection system on one of its advertising programs in an effort to stamp out a practice used to generate income from domain names without paying for them.

The practice, called "domain kiting," takes advantage of a five-day grace period that exists when registering domain names with the Internet Corporation for Assigned Names and Numbers (ICANN), the group that oversees the registry of domain names.

Originally designed to allow people to rectify mistakes, such as spelling errors, the grace period has since become controversial because automation allows savvy computer users to sample domain names in large numbers and keep those that might generate ad revenue. This practice is called "domain tasting."

Because domain kiting is essentially a perpetual motion scheme for domain tasting, curtailing kiting will limit tasting. In January 2007, VeriSign said that among the top 10 domain registrars, 95 percent of all deleted .com and .net domain names were the result of domain tasting.

"We have long discouraged domain kiting as a practice," Google said in an e-mailed statement. "In order to more effectively deter it, we are launching a new domain kiting detection system. If we determine that a domain is being kited, we will not allow Google ads to appear on the site. We believe that this policy will have a positive impact for users and domain purchasers across the Web."

As of second week of February, Google plans to begin blocking AdSense for Domains ads from appearing on kited domains. The company did not provide further details about how its kiting detection system will work.

In October, Yahoo sued several domain name registration companies over tasting, accusing them of targeting trademarks owned by Yahoo and other leading brands. The lawsuit is pending in U.S. District Court in Fort Lauderdale, Fla. Dell Inc. and BMW have filed similar federal lawsuits in Florida.

ICANN already is looking into name tasting and will soon ask a committee to review the issue and craft recommendations. A public comment period on draft procedures closes Monday.

The operators of the ".org" suffix already won approval to charge companies that make too many returns. The number of deletions dropped to 152,700 in June, compared with 2.4 million in May, after the new fee took effect.