If the reason for holding IPs is to be able to, say, mitigate network abuse, then a salt or other addition which is only available for a brief period would prevent being able to test a long-term datastore for a given IP.
If the reason for holding IPs is to be able to, say, mitigate network abuse, then a salt or other addition which is only available for a brief period would prevent being able to test a long-term datastore for a given IP.