IP address whitelist to update WordPress core and plugins

I would look at finding the IP address of the WordPress website.

For example, downloading bbpress manually gives me the link https://downloads.wordpress.org/plugin/bbpress.2.5.8.zip which when using ping in command prompt gives me the IP address of

66.155.40.188 (this matches the subdomain of downloads.wordpress.com)

I would whitelist the IPs found by @gmazzap as I found them too, however the download section as a different subdomain could and seems to be a different server.

I expect that when we update through the WP admin, that it essentially sends the link through to this same location.

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