IP search results are based on ARP data from routers. Typically ARP
data entries are kept by the routers 4 hours after the last packet
seen. Also keep in mind, the ARP collector only runs twice an hour
(0,30). Subtracting 4-4.5 hours from the end time gives you a
fairly good idea.
Since NAV 3.3 port numbers have been removed from the search in
favor of interface names. Historical search results will still
contain port numbers instead of interface names, as historical port
number data cannot be accurately mapped to interface names.
Checking the "inactive" checkbox will have no effect when
searching IPv6 address ranges. The output would be huge (about
1019 resulting rows for a /64 subnet).