What must be enabled in our firewall to access the webservices?

Our servers are protected by a firewall. IT asks what needs to be enabled in the firewall. Which port, which IP?

The GET AG's webservices are accessible via HTTPs and HTTP under the following URLs.

webservice1.ag-server.de,  webservice2.ag-server.de

In a firewall, port 80 for http and/or port 443 for https must be enabled. The following IPs must be reachable: 85.232.9.81 for webservice1 and/or 85.232.9.82 for webservice2.