The classic Casinos or the new online Casinos have defined over the time a set of specific rules for the dealer, those rules start when the points of the dealer reaches 17 or near but below, he must adhere to the rules written on the BlackJack table, most common hit on “Soft 17” or “stand on all 17”. 

Soft 17 will be a hand in which there is an Ace and another card making 17, that could be a Ace+2+4 or Ace+6.