25544 is the unique ID assigned by NORAD to the ISS. Amateur astronomers and satellite trackers use this ID to pull real-time orbital data (TLEs) to know exactly when the station will pass over their location. What’s Inside 25544.mp4?
To capture your own footage of the ISS, you don’t need a NASA-sized budget, but you do need timing: 25544mp4
Use tools like NASA's Sight the Station to find out when it's visible in your area. 25544 is the unique ID assigned by NORAD to the ISS