We are upgrading the way we manage our network infrastructure to be more responsive to events and business need. In order to support these changes, we are changing the IP addresses used by our API endpoints. The URLs and domains for all Authorize.Net websites and services will remain the same.
On January 16th, 2019 starting at 9:00am PT, Authorize.Net will be disabling the old IP addresses for our API endpoints for a short period of time to test before the final cut over to the new IP addresses schedule for February 13th, 2019.
For more details, see our support article, Authorize.Net Domains and IP Addresses:https://support.authorize.net/s/article/Authorize-Net-Domains-and-IP-Addresses