I have two primary IP addresses. My home IP and my work IP, but I also login from my phone fairly often and that gives me a 3rd IP. Napiform and I moved a few months ago and all of our IP addresses changed. None of that matters, you may be logged in to multiple instances of Abrosia from your account at once.
Regarding multi-accounts and Neocodex it is actually completely against the rules to have more than one account or to share an account, especially if that account has higher privileges.
SOURCE: The Neocodex Rules (Long Version)
Section 7 - Accounts
7.1 - Members agree not to, in any way, "share" their account with another member. Rankings do not matter; sharing of accounts is strictly non-permissible. Neocodex does not let you own more than one account due to security and organizational purposes (unless you have a valid excuse).
- 7.1.1 - Duplicate accounts will likely be investigated by staff, and are subject to deletion. Being a previously banned member will earn you another ban.
- 7.1.2 - Sharing of accounts for the purposes of sharing higher privileges (such as advanced member access) will be considered an offence of rule 4.2, and action 4.2.2 will be taken on the user. Please note that doing this is also a violation of the TOS that you agree to if purchasing a subscription, so therefore, no compensation will be issued for subscribers.
- 7.1.3 - Creating duplicate accounts in a disruptive way, or a way that bypasses an account restriction (such as trading post privileges or a suspension) will earn you 30% warn per instance, and an extension of your suspension if applicable.
Finally, regarding earning Advanced+ basically you are an Advanced Member that doesn't have to pay, there are several community members that had far exceeded the posting criteria set in place (500+ posts) and yet they were not voted in until much later. Off the top of my head it was Ivysaur (Pikachu/Venusaur), Tristen (Dorky), and myself that had exceeded the posting requirements. Other ways to earn Advanced+ include making substantial contributions to the community; creating good programs, finding AoBs, and writing guides are all ways of accomplishing this feat.
All in all, just be active and helpful. Try not to be annoying.