What is the ISS's SATCAT number?

The International Space Station’s SATCAT number is 25544. SATCAT, short for Satellite Catalog Number, is a numerical identifier used to track artificial objects in Earth orbit; the station is commonly listed as NORAD catalog number 25544.

The number was assigned after the first station elements began assembling in orbit. Unlike a spacecraft’s mission name or international designator, a SATCAT number identifies the tracked orbital object for space-surveillance purposes. The ISS is also associated with the international designator 1998-067A, which refers to its launch-era registration and is a different identifier.

The station’s catalog number can appear in satellite-tracking databases, orbital predictions, and amateur radio resources. Confusion often arises because individual visiting spacecraft, modules, and debris receive separate catalog numbers. The number 25544 refers to the assembled station as the primary tracked object, not to a particular expedition, module, or resupply vehicle.