There is an ability to include or exclude IP whitelist addresses or ranges in the Player Insights section of the Vidyard Platform.
When you type in a valid IP address or range, an error appears saying that it is not a valid IP Range.
The likely cause is that the IP address was copied into the platform but has white space at the front or end of text.
Remove the white space and hit Enter on your keyboard. This should add it to the list where it's possible to set whether to have it as a range to include or exclude.