The CCL in the EAR, Part 774 can determined what ECCN applies to a particular item. After determining the ECCN, determine if General Prohibitions 4-10 apply. If so a license will be needed. If a License Exception is available the item can be shiped under that License Exception. If not, you must submit a License Application.
First digit identifies the general categories within which each entries falls.
The letter immediately following the first digit identifies under which of the five groups the item is listed. The second digit differentiates individual entries by identifying the type of controls associated with the items contained in the entry. Contact the manufacturer, producer, or developer of the item in question. If the item has been exported in the past, then they may know the ECCN, what countries require an export license, and whether the item qualifies for a license exception. Instructions on how to use the CCL can be found in Part 738.