Search one file to see if it contains information from another file

I have two files. The first is unip.txt and the second is ipex.txt and each file contains IP addresses. unip.txt:

49.235.113.205
50.115.166.136
51.15.70.104
51.15.87.74
51.15.134.103
146.148.13.9
148.70.23.131
148.72.212.161
148.216.29.46
149.56.141.193

ipex.txt:

51.15.134.103
148.70.23.131
151.141.0.0
97.89.32.238

I'm trying to figure out how to basically search the unip.txt file to see if it contains any IP from the ipex.txt file. I imagine that it would be a loop to search through every line, but I'm not sure how to do it.