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Thanks for posting your question to the History Hub! This would require some research to answer-- there are no centralized or federally-created registration or roll numbers for Native Americans. Qualifications for tribal membership and registration identifiers are determined by each tribe, so it would depend on the group you are interested in. MaryFrances Ronan, a National Archives archivist, has posted several blogs about roll numbers here on the History Hub that may be helpful to you:
About roll numbers-- continued [https://historyhub.history.gov/groups/american-indian-records/blog/2017/06/30/about-roll-numbers-continued]
One more thing about Indian roll numbers [https://historyhub.history.gov/groups/american-indian-records/blog/2017/07/06/one-more-thing-about-indian-roll-numbers]
You want to find out about an Indian ancestor- [https://historyhub.history.gov/groups/american-indian-records/blog/2017/07/10/you-want-to-find-out-about-an-indian-ancestor]
Another example can be found on the National Archives web page describing Native American Heritage that offers clues on enrollment numbers as they relate, at least, to the “Dawes Rolls” and the Five Civilized Tribes. You’ll note from the examples on the page that on the ‘Dawes Rolls” each family member had a unique enrollment or roll number listed on the census card: https://www.archives.gov/research/native-americans/dawes/dawes-census.html
I hope this is helpful.