Assign entire subnets of public IP4/IP6 to a single app?

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Is it possible to assign, say a /48 or /32 or /24 (and so on) IP6 (or IP4) to a single Fly app?

I presume that using IP4 may be charged per IP per mo, while IP6 would be free…?

If assigning subnets isn’t supported currently, does Fly intend to in near future?

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We’ve thought about building this, at least for IPv6. What are you trying to do?

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Vend those addresses out to downstream clients, as a way to ID traffic coming from them, and apply whatever policies as set by them. The appeal is, such a mechanism would be protocol agnostic… I realise that today fly only supports TCP (over 4 and 6) and UDP (over 4) transports.