Modded Minecraft Servers for 1.21
Every Modded server on the list that runs Minecraft 1.21, ranked by votes this month. Point releases count, so a server reporting 1.21.4 is listed here too.
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Clear filtersYou need the same pack the server runs
A modded server runs a mod loader — Forge, NeoForge or Fabric — and you cannot join it with a plain client. You install the same pack the server runs, usually through CurseForge, Modrinth, Prism or the ATLauncher, and the version has to match exactly, down to the pack build number. Servers that publish a pack code in their listing save you an hour of guessing.
Packs come in flavours. Kitchen-sink packs like All the Mods throw everything in at once; expert packs gate progression behind a recipe chain that takes months; magic, adventure and modded skyblock packs are different games again. The pack decides what the server is far more than the server rules do.
Because mods are heavy, ask about memory and chunk loading before you commit. A 300-mod pack wants six gigabytes allocated on the client, and a server that bans chunk loaders makes most automation pointless. A modlist you can read before joining is a good sign; a refusal to share one is not.
What 1.21 added, and why it took servers a while to move
Tricky Trials landed in June 2024, and its centrepiece is the trial chamber: a generated copper-and-tuff dungeon full of trial spawners that stop producing once you clear them. Run one with an ominous bottle active and the vaults pay out better. It also brought the Breeze, the Bogged and the mace, which hits harder the further you fall onto something.
For a server, the crafter mattered more than any of that. Automated crafting had been a modded feature for a decade, and having it in the base game changes what a redstone farm can do without a single plugin. Copper bulbs and the full tuff block set filled out building palettes at the same time.
The 1.21 line kept moving after release — the pale garden and the creaking arrived in 1.21.4, and later point releases added more again. That is worth remembering when you read a listing, because 1.21 can mean anything from 1.21.1 to the newest patch. Most servers run Paper behind ViaVersion and accept a range of clients, so connecting is usually the fastest way to find out.