If you're planning to transfer several domains from your Dynadot account, you can download your authorization codes in bulk by following these steps:

1. Sign in to your Dynadot account.
2. Select "My Domains" from the left-side menu bar and "Manage Domains" in the drop-down.
3. Unlock your domain(s).
4. Go back to "My Domains" in the left-side menu bar and then "Folders" from the drop-down.
5. Click the "Download" icon on the right side of the page.
6. If the domains are in a specific folder, you can select that folder in the top drop-down menu. Otherwise, you can leave it set to "All".
7. On the "Folder Download" page that opens up, check the box next to "Authorization Code" and any other information you want downloaded (optional).
8. Press the "Download" button to download your CSV file.