Several people have reached out to us regarding the CTA's drone serial number standard, ANSI/CTA-2063, and not being able to get a copy without paying for it.  We located a page on the CTA's webpage where the standard can be downloaded for free (link below).  Additionally, ANSI/CTA-2063 calls for manufacturers to get an ICAO Manufacturer's Code (link below).  The process to get the Manufacture's Code took one email and about one business day to receive from ICAO.  

ANSI/CTA-2063 is available from the CTA for free from the following page:

In order to obtain an ICAO Manufacturer's Code, follow the directions on this page: