Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
This page provides the message formats and technical specifications necessary to electronically transmit data to CBP's automated systems.
| Attachment | Ext. | Size | Date |
|---|---|---|---|
| ACE Appendix S – AES Acronyms and Definitions | 322.83 KB | 03/22/2024 |
