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What is an “Alien Registration Number”?

The Alien Registration Number is a unique code that identifies foreigners in the U.S., fundamental for tracking immigration processes, ensuring benefits, and maintaining legal status in the country.

Written by

Victoria Harper

Editor-in-Chief

Updated on November 3, 2025
2 min read
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Immigration processes in the United States involve a series of important terms and numbers that help authorities track each case uniquely and organized. One of these is the Alien Registration Number, frequently seen in various situations, including cases involving the U visa.

The Alien Registration Number, also known as the A-Number, is a unique number assigned by the U.S. Department of Homeland Security (DHS) and the U.S. Citizenship and Immigration Services (USCIS) to identify foreigners who enter or are already in the country. This number, usually composed of the letter “A” followed by a series of digits, is essential to track the individual”s immigration history.

For example, when someone applies for benefits or status changes, as is the case with processes involving the U visa, the A-Number is recorded in their documents and helps compose their history with the responsible agencies. Keeping this number safe and properly documented is crucial, as it is used to link records, update processes, and verify eligibility for various benefits.

Therefore, it is very important to strictly follow U.S. immigration laws, consult reliable sources, and avoid scams or marketing campaigns that promise quick and guaranteed solutions in immigration processes. Getting information through official channels, such as USCIS itself, is always the best practice to avoid setbacks.

In summary, the Alien Registration Number serves as a kind of “identity” for the foreign individual within the American immigration system, being a key piece for the organization and management of their situation in the country. Remember that being well informed and following official regulations is essential to maintain your legal status in the country.

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Victoria Harper

Editor-in-Chief

Meet the author

Leading journalism and editorial content at Visto n’ Visa, Victoria helps make immigration topics clear, trustworthy, and easy to understand. Her focus is on delivering useful, human, and relevant content for people exploring new paths abroad.

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What is an “Alien Registration Number”?

The Alien Registration Number is a unique code that identifies foreigners in the U.S., fundamental for tracking immigration processes, ensuring benefits, and maintaining legal status in the country.

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