CelesTrak
FreeLiveLast verified 24 Sept 2026
Satellite orbital element sets (TLE/OMM) and catalog data for tracking objects in space.
Example request
curl -s 'https://celestrak.org/NORAD/elements/gp.php?CATNR=25544&FORMAT=JSON'
Free tier, in plain English
Free and key-free for everyone; CelesTrak just asks that you follow its usage policy and not hammer the same data repeatedly.
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