What is the moment of inertia of a rod of mass M and length L about an axis perpendicular to it and passing through one end ?

For the rod of mass M and length L the M.I of the rod about an axis passing through its centre of mass and perpendicular to its plane is $\mathrm{I}={\mathrm{ML}}^2/12$
Using the parallel axes theorem,
${\mathrm{I}}^{\mathrm{\prime }}=\mathrm{I}+{\mathrm{Ma}}^2$
With a = L/2
we get,
${\mathrm{I}}^{\mathrm{\prime }}=\mathrm{M}\frac{{\mathrm{L}}^2}{12}+\mathrm{M}{\left(\frac{\mathrm{L}}{2}\right)}^2=\frac{{\mathrm{ML}}^2}{3}$