I am assuming you are asking this question because you are possibly applying primarily to European colleges and want to know where else you can throw the hoop. I took TOEFL when I was applying for colleges. I remember that TOEFL has a list of colleges who subscribe to TOEFL scores and that list is visible from the TOEFL dashboard. I am guessing similar such list might exist on IELTS dashboard also.

Here you can find the IELTS score that you need in order to apply to universities:
 

https://www.ielts.org/about-the-test/who-accepts-ielts-scores
 

I hope you find it useful!