How to Set Up an ATM11 Server in 2026

What is ATM11?

All the Mods 11, usually shortened to ATM11, is the newest large kitchen-sink pack from ATMTeam. It combines technology, magic, exploration, storage, automation, and newer mods that are available for the Minecraft 26.1 generation. The pack is designed for players who want several progression paths in one shared world rather than one tightly scripted campaign.

ATM11 is a natural multiplayer pack because players can specialize. One person can build power and automation, another can explore, and someone else can focus on storage or magic without blocking the rest of the group. The tradeoff is operational: ATM11 is still moving quickly, so server owners need stricter version matching and backups than they would with the mature ATM10 branch.

Current Version, Loader, and Java

As of September 22, 2026, the official file history lists ATM11 0.9.0-beta for Minecraft 26.1.2 on NeoForge, with matching server files published September 19. Use the same ATM11 release on every client and on the server. This does not make ATM11 compatible with vanilla Minecraft 26.3.

Minecraft 26.1 requires Java 25. This is a hard runtime change from ATM10 and most Minecraft 1.21.1 packs, which use Java 21. Check the active runtime with java -version before troubleshooting anything else.

ATM11 RAM Requirements

ATM11 is an extra-large pack. RAM helps it load a large mod set, but CPU speed and disciplined chunk loading matter just as much once factories and multiple bases appear.

These are practical starting points, not promises that more memory fixes every problem. If TPS falls while memory is still available, profile the server before upgrading. Our Minecraft server lag guide explains how to separate CPU, chunk, entity, and memory issues.

Quick Setup with ModReady

ATM11 is changing faster than ModReady's pinned catalog entries, so use the custom modpack request instead of assuming an older ATM profile is the same pack.

1. Choose Modded Pro for a 10 GB starting point, or a larger plan for a busy group.
2. In the custom modpack field, enter All the Mods 11 - ATM11 0.9.0-beta, or the exact release agreed with your group.
3. Ask for the matching official server pack and Java 25 runtime.
4. Pick the region closest to most players and complete checkout.
5. Keep automatic backups enabled before accepting future ATM11 updates.

Confirm availability of the requested release before moving an existing world. Keep the current server and its backup intact until the replacement has passed a test with matching clients.

Self-Hosting ATM11

1. Install a 64-bit Java 25 runtime. Minecraft 26.1 will not start on Java 21.
2. Download the official ATM11 server pack from the ATM11 CurseForge page. Match the client release exactly.
3. Extract into a clean folder. Do not merge ATM11 into an ATM10 server directory.
4. Run the included server-start script for your operating system and let it download the required NeoForge files.
5. Accept the EULA by setting eula=true.
6. Start with conservative settings and open port 25565 if players connect to a machine on your home network.

view-distance=8 simulation-distance=6 max-players=8 online-mode=true allow-flight=true

Use the server pack's included NeoForge build. Installing a newer loader because its version number looks better can create subtle compatibility bugs. The pack manifest, server pack, and client release should remain a matched set.

Safe ATM11 Update Workflow

ATM11 is beta software, so treat updates as planned maintenance rather than an automatic button press.

1. Read the ATM11 changelog and issue tracker before updating.
2. Stop the server cleanly and create a complete backup.
3. Keep the old server directory until the new version has passed a test boot.
4. Update every player to the exact same ATM11 version.
5. Check world loading, player inventories, dimensions, and core automation before reopening the server.

If your group wants a season that runs for months with minimal maintenance, read our ATM11 beta readiness verdict before choosing ATM11 over ATM10.

Common ATM11 Server Issues

For a complete test-and-rollback checklist, follow our modpack server update guide. A beta release should be tested on a copy of your world before it replaces your group's server.

Sources Checked

Version details were checked September 22, 2026 against the official ATM11 file history. Runtime context comes from Mojang's Minecraft 26.1 technical notes. RAM figures above are planning estimates, not benchmark results for this beta.