Connecting to Marketplace (Provider Firewall Whitelisting information)

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Hello everyone,

I've recently installed concrete5 for the first time on our new host and we're loving it. However we're having a problem connecting to the marketplace right now. I've contacted our provider to confirm that we can use outbound connections and they have said they would add it to their firewall for whitelisting if I can: "Can you confirm the external host to which the site connects and if possible the ports in use we can then open up access on our outbound firewall cluster this side."
Does anyone have any idea what the ports and host are? I'm not sure what to tell them and I'd love to get this problem resolved. I guess I basically need the ports used to connect to the marketplace?

Just to rule it out, cURL and allow_url_fopen are indeed enabled.

Regards,
Dan