The First Digipeater and Last Digipeater filters allow you to view only stations and objects forwarded by specific digipeaters and/or I-Gates.
The digipeater lists show all the stations that showed up first and last in any packet transmissions' digipeat paths. If that message was relayed through a station that did not implement tracing (also known as UITRACE), the last alias through which the message was digipeated is counted (since the relaying station did not identify itself).
Unchecking the box for any digipeater stops the display of stations and/or objects using that particular first or last digipeater. Note that unchecking a standard digipeating alias will not filter out stations that were UItraced on their digipeater.
Clicking the column heading sorts the table by the specified column.