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The $A\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Pi -X\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Sigma (0,0)$ band of MoN between 5990 and 6350 {\AA} has been studied using intermodulated laser induced fluorescence spectroscopy. MoN was produced by reacting vapourized $MoCl5$ with microwave discharged $N2$ gas in a flow system. The sub-Doppler spectrum obtained was at a resolution of less than 100 MHz. The magnetic hyperfine structure caused by $\mathrm{<mrow\; data-mjx-texclass="ORD">95</mrow>}Mo$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">97</mrow>}Mo$ nucleus $(1=5/2)$ is mostly resolved. The hyperfine linewidths vary with J in the manner expected for spin uncoupling from case $(ab)$ to Case $(bbj)$ in a high spin multiplicity state. Acknowledgement: The work was carried out with support from the Hong Kong Research Grants Council under Grant HKU 253/95P.