ATLANTIC CITY, N.J. — New Jersey gambling regulators gave six casinos the green light to offer Internet gambling statewide on Monday.

The state Division of Gaming Enforcement’s decision, which came after more than four days of testing the technology involved in online betting and making sure gamblers are within New Jersey, allows the state to join Nevada and Delaware as the only ones offering Internet gambling. It authorized six of the seven casinos that hold Internet gambling permits to immediately offer online gambling throughout New Jersey.

“At this point in time, the casinos are trying to gear up for larger play in the state,” division director David Rebuck said in an afternoon conference call with reporters.

He didn’t immediately have an estimate of how many people had logged on during the test period but said it had topped 10,000 fairly early during the test.

“I don’t expect any widespread, significant problems,” he said.

Technically, Rebuck’s order authorized the casinos to continue unrestricted play beyond the test period’s midnight Monday expiration. But because the casinos were already in around-the-clock play as part of the testing, his decision effectively gave them permission to do statewide gambling immediately, he said.

The six casinos approved are the Borgata Hotel Casino & Spa; the Tropicana Casino and Resort; Trump Plaza Hotel and Casino; the Trump Taj Mahal Casino Resort; Bally’s Atlantic City and Caesars Atlantic City. They immediately began offering promotional deposits to players. The Tropicana announced a $50 sign-up bonus.