This article doesn't differentiate b/w 2.4 and 5 ghz but it does provide some information on device limitations
Please let me know if this answers your question
@ComcastHana I think that they mean the number of devices that can connect simultaneously ?
Correct. How many devices can be connected. Had 1 tech say 250. Another said 10. Yet another said 15. At the time, I had 25 connected to 2.4. But would not permit more. I purchased a separate router and now have 50ish running through it with no issues. Conclusion, even though xfinity techs are unaware of limits and, online info says 250....the modem/router does limit devices. For the cost of service, lame!
Thanks to those that responded!!
You seem to be confused here.
A typical Class C network will support around 250 IP addresses, yes, but that's not the same as having all of them on WiFi, much less have them all connected at once.
A modern wireless router will limit how many of those devices can connect at any time because of bandwidth limitations - not just radio interference from all the devices connected, but for practical reasons. If your WiFi has a 300 Mbps speed and you have 30 devices connected, each one will have 10 Mbps of bandwidth apiece. Considering that some devices like PCs will suck up bandwidth considerably (assume that you're downloading a large file and you wind up using 250 Mbps of your available pipe) then you're left with 50 Mbps to share between 29 devices... at an average of 1.72 Mbps per device.
Factor in radio interference from so many devices sharing the wireless network, well, you can see what problems this will create.
There are tools to lmiit bandwidth hogging for devices, but if you want to avoid congestion on your WiFi network, you will need to offload as many of them to Ethernet as you can, or split up your WiFi devices to connect to different wireless access points on your network.
You can read more here.