No, this is just a self help solution.
Their documentation is also sometimes out of date or simply wrong, so, idk what’s better lol.
They’re on cloudflare, and the IPs might even be managed by cloudflare(?), if that link is compromised then we’re all gonna have big issues lol.
That said, you’re not the first to ask (OpenAI Rest API IP CIDR for Connections), so I’m gonna tag your question as a feature request and let’s hope that an employee considers it 