Čtyřicetdva

C-O-D-O-S-T-A-N-E-T-E-K-D-Y-Ž-V-Y-N-Á-S-O-B-Í-T-E-Š-E-S-T-K-U-D-E-V-Í-T-I-?

Install the Remote Server Administration Tools (RSAT).
Go to Control Panel → Programs and Features → Turn Windows features on or off
In the treeview, go to Remote Server Administration Tools → Role Administration Tools → AD DS and AD LDS Tools and select AD DS Tools. Click OK.

Netdom should be located in your system32 folder.