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I always thought WhatsApp published their list of IPs (segregated by standard chats vs media), but it seems they only share CIDR blocks with operators privately: https://www.whatsapp.com/cidr.txt

And you say there's no segregation between chat and media - and I trust your out of date info more than my completely made up guesses.

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Yeah, that text file included messaging and multimedia (and verification and the website, etc); there was another one that included those and VoIP relay servers (but VoIP also can do p2p, so it's harder to include in special pricing), until it moved to the private portal. Customer service would sometimes provide the link to that text file, and operators we had an active agreement with would get an email when the file was updated (or sometimes when my scripts broke and did stupid things, sorry operators). (While I was there) We never provided a chat only file, because chat only is not a user experience we wanted to have happen.

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