What is the SRID for EPSG 102743?

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I am trying to create a table in PostGIS for some LiDAR data and I need to set the the_geom column to my data's SRID. My data is in EPSG 102743, but when I try to use 102743 as my SRID as the_geom I get this error:
ERROR: AddGeometryColumn() - invalid SRID
spatialreference.org and epsg.io both say that it should be 102743, but that isn't working. This is me PSQL statement:
ERROR: AddGeometryColumn() - invalid SRID

What is the correct SRID for EPSG 102743?



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