Compare IP_address field in 2 indexes and ignore the data with the same values / or matches and display the rest.

Want to run a report by comparing 2 indexes on " IP_Addresses" field. Ignore any matching " IP addresses" (If IP are present in both indexes then ignore else display in query / report) or list any unique " IP addresses" in either index (If present in one but not in one of the other index) in last 7 days. Thanks in advance.