I have had the good luck of making my first ISS contacts over the past two weeks -- four contacts! It was very exciting!

Just for fun I looked up the callsign NA1ISS in the FCC database at http://fjallfoss.fcc.gov/General_Menu_Reports/callsign.cfm, and the response is [No Match for this Callsign in the Database! "NA1ISS" not found in FCC Databases].

Interestingly, it seems that the FCC rules (47 CFR 97.119(a)) specifically exclude a space station from the requirement to identify itself.

So I was just wondering... is the callsign "NA1ISS" just something that somebody made up?