ARISS is an abbreviation for "Amateur Radio on the International Space Station" and is a program that lets students experience the excitement of amateur radio by talking directly with crew members of the International Space Station.

Astronauts aboard the ISS use these amateur radio callsigns -

Russian: RS0ISS USA: NA1SS European: DP0ISS, OR4ISS, IR0ISS

Packet Station Mailbox: RS0ISS-11 and RS0ISS-1