  Na4Ir3O8 is a unique case of a hyperkagome 3D corner sharing triangular
lattice which can be decorated with quantum spins. It has spurred a lot of
theoretical interest as a spin liquid candidate. We present a comprehensive set
of NMR data taken on both the 23Na and 17O sites. We show that disordered
magnetic freezing of all Ir sites sets in below Tf $\sim$ 7 K, well below J =
300 K, with a drastic slowing down of fluctuations to a static state revealed
by our T1 measurements. Above typically 2Tf, physical properties are relevant
to the spin liquid state induce by this exotic geometry. While the shift data
shows that the susceptibility levels off below 80 K, 1/T1 has little variation
from 300K to 2Tf. We discuss the implication of our results in the context of
published experimental and theoretical work.
