Given the following IP address with its subnet mask, the network ID will be $158\mathrm{.}20\mathrm{.}0\mathrm{.}0.$

$158\mathrm{.}20\mathrm{.}50\mathrm{.}66,$ subnet mask $255\mathrm{.}255\mathrm{.}0\mathrm{.}0.$

True or false