That's a REALLY broad question - do you mean for international orange or international red? Or do you mean the company, International?
What I can tell you is that from here at home, I was able to type in "coatings and color manual" into Google, and the top response was COMDTINST M10360.3C. And I can tell you that it has an appendix at the end with all the authorized coatings, including their stock numbers if applicable.
If you're looking for paints by the company International, like GromitCU said, the Coatings and Color manual (M10360.3) will help you out. You can also contact the company or visit the website: international-marine (dot) com. Page 16-9 of the manual has a table specifically with International products and NSNs. The company can probably provide you with NSNs, and another option is to search GSA Advantage. My advice is to be sure to use the manual while coordinating with the company to get the right (CG-approved) product for the job. Not sure if you have much experience using this manual, but it's worth knowing how to use it... so if you have any questions about using it (for example, cross-referencing between a chapter and appendix), I'd recommend that you either ask a supervisor or post your question on the boards. Good luck, -BM2 W.