Alien number for F1 Visa OPT EAD holder

The alien registration number, which the Department of Homeland Security assigns to each alien. It is an "A" followed by eight numbers. For example: A12 345 678. Some recently-issued A numbers consist of an "A" followed by nine digits. For example: A 200 345 678. The number you are referring to is most likely your A number.

Whenever an EAD is issued the alien is assigned a number. When your AOS application is receipted you will get a new alien registration number.

You Alien number may be listed on the top of your approval letters. Usually starts with an "A" at the beginning.