Ipv4 allocation update

[Anvil]

Hello again!

So while trying to solve my own issue with asyncwhois incomplete IPv4 allocations list (#78), I've made a small tool to retrieve the data from iana and produce the structure currently used by asyncwhois.

Here's what I did:

• put a program in tools/ipv4-allocations-update (it's commented/documented). It relies on httpx and netaddr. Netaddr allowed me to easly minimize the number of entries in the resulting output to try speeding up the asyncwhois lookup process a bit.
• Call that program and produce the data in asyncwhois/servers/ipv4.py through tools/ipv4-allocations-update | black -l 79 - > asyncwhois/servers/ipv4.py.
• Modified the servers.py a bit to receive the new file. The point was to separate the code from the generated data. It would not any good to mix up the two files, I think.

[pogzyb]

This is great! I really appreciate your contribution.

Modified the servers.py a bit to receive the new file. The point was to separate the code from the generated data. It would not any good to mix up the two files, I think.

I like this approach and I'll probably reuse your same method for auto-generating the domains root db too.

Thanks again