Which one of the following prefixes matches 164.122.13.115?
Which one of the following prefixes matches both 63.247.29.198 and 63.245.228.243?
Which one of the following address prefixes contains 80.76.81.56/30?
Enter an address prefix that matches 36.155.220.35:
Enter an address that matches 211.194.168.204/31: