title: Determine credit card type by number?
body: <p>Can credit card type be determined solely from the credit card number?</p>
  
  <p>Is this recommended or should we always ask client for the type of credit card they're using?</p>
  
  <p>I Googled about it and found this algorithm: <a href="http://cuinl.tripod.com/Tips/o-1.htm" rel="nofollow noreferrer">http://cuinl.tripod.com/Tips/o-1.htm</a> , is this reliable?</p>