# of Unique Participants in a meeting

API and Webhooks
1

What is the number of participants listed on a Zoom report screen for an individual meeting based on?
I have one meeting that the report page inidicates had 256 participants. The meeting API lists 513 participants altogether, but that seems to include people who connected for a minute and then reconnected a second time. If I count only unique usernames I get 217. Where is the 256 number coming from? Is there some unexposed way to determine unique users based on IP address etc.?

Related point - is there a way to determine the peak number of concurrent participants?

2

Hey @stsimon,

Which API endpoint are you using?

Currently our API just shows the total number of participants who joined.

Thanks,
Tommy

3

Using the report endpoint, although I’ve tried with the dashboard too.
The number of unique participants zoom lists for a given meeting doesn’t seem to match what I can determine based on running the full report. (E.g. one meeting had about 513 participants, which was 270 approx unique participants, but running the report I only had ~230 unique names listed.
Is there really no way to calculate the “true” unique number of participants?

4

Hey @stsimon,

This may be related to the dashboard and report data issues happening right now. More details here: status.zoom.us

Thanks,
Tommy

5

I don’t think so. Maybe the unique participants is calculated from unique IPs?

6

Hey @stsimon,

Can you email these details along with the meeting IDs to developersupport@zoom.us so we can investigate further?

Thanks,
Tommy