What happens when Zoom registration is full?

Hi!

We have been working within the 100 capacity for our Pro license for the time being, but attendees may soon be exceeding the 100 limit. We require registrations at our meetings. My question is, do potential registrants receive a message that the meeting is full when we reach 100 registrations? Also, is there any way that we can determine how many people over the 100 limit tried to join, but couldn't? Knowing that number would give us a better handle on whether or not to increase capacity.

Thanks!