As in the title.

Approx. 12 hours ago my server dissappeared from any listing in game. A quick search in the web got me this link from steamforums : https://steamcommunity.com/app/252490/discussions/0/2763442118816612303/
An official list of banned server IP's by facepunch..

I am running a non modded server with only admin tools like Vanish, Playeradministration, Grouplimits etc. 

Why would this happen? And after 3 years of running the same server layout. Why now?

You should contact their support instead.

I dont think Group Limits counts as admin tool since it affects everyone on the server.

What more plugins do you have?

PlayerAdministration.cs
BetterChatMute.cs
Arkan.cs
AdminHammer.cs
EnhancedBanSystem.cs
PlayerTracker.cs
ImageLibrary.cs
GodmodeIndicator.cs
ExplosionTracker.cs
RaidTracker.cs
Vanish.cs
Rename.cs
NoRecoil.cs
NoGreen.cs
NoGiveNotices.cs
NightVision.cs
InventoryCleaner.cs
GroupLimits.cs
EntityOwner.cs
DiscordMessages.cs
ConvertStatus.cs
CombatLogDb.cs
BypassQueue.cs
BackupExtended.cs
AdminRadar.cs

Mod that affect everyone seems to be GroupLimits only
But the enforce call is null so it only functions as a warning and notices the admin that's it.

Also inventorycleaner and nightvision permissions are only granted to admin group. (Maybe these are the problem?)

I mean there are full pop servers in my region with full 2x 3x modded with altered night times, furnace splitters, vipe kits, auto turning lights etc on Community. And they are operating since months and nothing happens despite my tickets to support. Yet from that pile, our vanilla ip gets into banned list. Frustrating

It doesn't matter who have permissions, you got tons of plugins in community listed server, you are allowed to use admin tools like rustdmin.... if you will email to facepunch they will answer really fast with a reason of ban. As i spoke with them, most of banned servers are banned by their auto ban mechanism and it's temporary ban for 24 hours unless you didn't fix your issue.

Yeah that definately counts as modded

I'm not sure if Facepunch is able to check what plugins your server have installed, but with a list like this and looking and what plugins you use (imagelibrary?) then i'm pretty sure it's visible for every player (including facepunch staff) that you have a (too) modded server

Just message them a list of your plugins or ask why they decided this

where do I end these ? I was also banned from the list

Is your server in the community server tab?