This documentation list the public communicating servers for print partners.
As a print partner you can expect to get order data posted from the following IP addresses.
Signals back to Cloudprinter are posted to the CloudSignal API, which is handled by the CloudSignal service. The CloudSignal service have the following DNS names.
|CloudSignal||api.cloudprinter.com||443||TLSv1, TLSv1.1, TLSv1.2|
See the CloudSignal API documentation for the specific endpoints