I've been wondering about this too, im not banned but just don't want to be posting on honeypotchan with my raw ip address. I have been researching about ways to post with proxy/vpn. So far this is what i came across but haven't pulled the trigger yet because I don't want to waste money and maybe im just better off not wasting time shitposting on 4chan
1.rotating proxy (from blazing proxies)
costs about $10. Problem is other people share the same ips that get rotated meaning they might of been burnt already. Im guessing you will have to keep retrying every 10 mins until you get a working ip address.
2.ipv6 proxy ip
it says guaranteed clean ip, and it only costs only a dollar. But can you actually use these to post on 4chan?
3.obscure vps provider or AWS
When I went ip fishing on honeypotchan i noticed a few ip's that were VPS servers from linode and Amazon AWS instances. These are also cheaper than using a rotating proxy but they are kind of a pain to setup. There were also some ips from vps providers I've never heard of and were too obscure to have been used to abuse 4chan. Problem is i dont know if those ips are saw were using a 4chanpass or not so they might not be clean ips.
I have a question about range banning technology though, how the hell do 4chan and sites detect that your ip is a proxy or vpn? Is there a database of marked ips that get shared somewhere? I've tried signing up to other honeypot sites in the past and they somehow know im using a vpn and it leads me to think they're using a shared list of known ips. If they are doing this then what is the database called?