There's a very good chance that you're actually using third-party modern high-performance reimplementations of these libraries, like MKL or OpenBLAS. The origin

There's a very good chance that you're actually using third-party modern high-performance reimplementations of these libraries, like MKL or OpenBLAS. The original Netlib libraries are often a compatibility fallback. For example the Windows installer of Octave asks you which one you want to use.