How to get the ID Ranges:
To get an id range, you must enter in a lol king profile of someone that plays in the server that you want to scrape
For example www.lolking.net/summoner/euw/21407243
Start range 21407243, end range 31407243 for example, make sure the end range is an active summoners id so that it actually works!
Another Example:
i have this www.lolking.net/summoner/br/4430000
I can open in my browser www.lolking.net/summoner/br/4440000 and www.lolking.net/summoner/br/4450000 and see if the end range is not an empty id, without summoner name, if there's a summoner name in the end range, then you can conclude that you won't have "ids without summoner name" in the interval between the start and the end range.