// modpack server guide
Cobblemon Academy server hosting & setup guide
A Cobblemon Academy server needs Java 21 and about 6–6.5 GB of RAM for up to 3 players.
A Cobblemon pack on Fabric 1.21.1 from the team that runs the Cobblemon Academy public server: new biomes, hundreds of structures, trainer and gym battles, and an easy economy.
Pack details checked by hand against Cobblemon Academy 2.0 on CurseForge on October 5, 2026.
Cobblemon Academy 2.0 is a Fabric modpack for Minecraft 1.21.1 with 221 mods. We'd pick our Premium plan (8 GB) for it.
- The authors say raids, dungeons, hideouts, ranked battles, the safari world, daycare and the shop system from their public server don't work on privately hosted worlds yet.
- Versions 2.4.2 to 2.7.0 have no official server files, so the 2.4.0 server files only suit players who also install 2.4.0. However you set the server up, its pack version must match the one your players install exactly.
- See also: Cobblemon Official Modpack (Fabric) server guide.
Quick facts
| Loader | Fabric |
|---|---|
| Minecraft versions | 1.21.1 |
| Java needed | Java 21 for Minecraft 1.21.1 Java version chart. |
| Mods | 221 modsThe number of mods CurseForge lists for the pack, client-side ones included. |
| RAM | About 6–6.5 GB for 1–3 playersBy player count. |
| Downloads | 518,174 on CurseForgeAs of October 5, 2026. |
| Latest version | September 23, 2026 (version 2.7.0)The newest version when we checked on October 5, 2026. |
| Official server files | Download pageThe authors published server files on CurseForge up to version 2.4.0 (Cobblemon Academy Server Files 2.4.0.zip); the later versions, 2.4.2 to 2.7.0, came without them. |
| Where to get it | Cobblemon Academy 2.0 on CurseForge |
| Tags | adventure and rpg, exploration |
Cobblemon Academy server files
Cobblemon Academy's authors publish official server files. The authors published server files on CurseForge up to version 2.4.0 (Cobblemon Academy Server Files 2.4.0.zip); the later versions, 2.4.2 to 2.7.0, came without them. Get the official server files.
Use the server files for the exact version your players install: a server and client on different pack versions won't connect.
How much RAM does a Cobblemon Academy server need?
| Players online | RAM | DSN plan |
|---|---|---|
| 1–3 players | About 6–6.5 GB | Premium (8 GB) |
| 4–8 players | About 6.5–8.5 GB | Heavy (12 GB)Premium (8 GB) can do if players stay close. |
| 9–15 players | About 8–10.5 GB | Heavy (12 GB)Premium (8 GB) can do if players stay close. |
Estimated from 221 mods with our RAM calculator, not measured: low end if players stay together, high end if they spread out.
Set Java's heap (-Xmx) 10–15% under the RAM you have, about -Xmx7000M on 8 GB. Fabric 1.21.1 takes it in the java command (-Xmx), usually in the start script. RAM guide.
Cobblemon Academy server requirements
| Java | Java 21 |
|---|---|
| Loader | Fabric for Minecraft 1.21.1 |
| CPU | Fast single-core speed (one main thread). With 221 mods, the first start takes minutes. |
| RAM | About 6–10.5 GB for 1–15 players (table above) |
| Disk | The server files, a growing world and backups |
| Network | TCP port 25565 open to players |
Recommended plan
Our pick for Cobblemon Academy
Premium
8 GB RAM · planned launch price $30/month
The authors don't publish RAM advice, and CurseForge lists 221 mods for the pack, client-side ones included, so 8 GB suits a small group.
Ordering is closed until we relaunch. We aren't taking orders or payments while we move to new hardware. Join the launch list and we'll email you when Premium servers open.
Running it for a bigger group or a public server? Go up to Heavy (12 GB, $42/month). Not sure? Email hello@dsnservers.com.
Planned launch price in USD, billed monthly once ordering opens, with a 7-day refund window.
How to make a Cobblemon Academy server on your own PC
What's specific to Cobblemon Academy, step by step. The full walkthrough for any pack: how to make a modded Minecraft server.
- Install Java 21.
Check with
java -version. Java version chart. - Get the server files.
Download the official server files for the version your players use and unzip them into an empty folder. Follow the readme that comes with them.
- Start it and accept the EULA.
Run the start script in the server files, or
java -jaron the Fabric 1.21.1 server launcher, then seteula=trueineula.txtif you accept Mojang's EULA (EULA step). With 221 mods, the first start takes minutes. - Set the RAM with
-Xmx, sized from the table above. - Let friends connect: forward TCP 25565, or use a tunnel or host behind CGNAT (can't connect?).
Or run Cobblemon Academy on DSN
Once we relaunch (join the launch list), on DSN you'd install Cobblemon Academy from the panel's CurseForge modpack installer, pick Java 21 on the Startup tab and accept the EULA in the console. No port forwarding. We haven't tested the panel's installer with this pack: its newest versions have no server files, so a CurseForge installer builds the server from the client pack. Check that it starts, and remove any client-only mod the log names.
How to play Cobblemon Academy with friends
Each player installs Cobblemon Academy with the CurseForge app or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.
Different versions of Cobblemon Academy on the server and a client show up as Mismatched mod channel list or mod rejections. Why friends can't join, timeouts included.
Lag and performance on Cobblemon Academy
Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once Cobblemon Academy has enough (tick lag guide). For Cobblemon Academy:
- Measure first: spark's
/spark tpsand profiler work on 1.21.1 and name the mod or machine using the tick time. - Distances:
view-distance=8and a lowersimulation-distanceinserver.properties. - Pre-generate: Chunky for 1.21.1,
/chunky radius 3000then/chunky start, before people explore.
Common Cobblemon Academy crashes
What a Fabric 1.21.1 server running Cobblemon Academy hits most. For any other error, paste the log into the free crash log analyzer.
- Wrong Java version. Cobblemon Academy on Minecraft 1.21.1 needs Java 21. Started on Java 17, it stops with
UnsupportedClassVersionError: ... class file version 65.0, this version of the Java Runtime only recognizes class file versions up to 61.0. Java version fix. - Out of memory. Cobblemon Academy (221 mods) needs about 6–6.5 GB for 1–3 players;
java.lang.OutOfMemoryErrormeans it ran out. Out-of-memory fix. - Client-only mod on the server. This one shows up when the mods folder is copied from a player's game instead of installed as a server. Check a mods list with the client-or-server-side checker. Client-only mod fix.
- After adding or updating a mod. Mods you add to Cobblemon Academy by hand usually crash it with a missing dependency or a mixin conflict.
- Ticking entity or block entity. The crash report names it and gives its coordinates. Ticking entity fix.
Updates and support
Before moving Cobblemon Academy past version 2.7.0, back up the world: see updating a modpack server without losing your world.
Bugs in Cobblemon Academy itself go to its authors through its CurseForge page. Server problems on DSN: hello@dsnservers.com or Discord.
Packs like Cobblemon Academy
More: Cobblemon server hosting, all modpack guides and how to make a modded server.
Run Cobblemon Academy on DSN when we relaunch.
Our pick, Premium: 8 GB, planned at $30/month.
DSN Servers isn't affiliated with Cobblemon Academy 2.0 or CurseForge. We wrote the summary and checked the pack's facts by hand on October 5, 2026. Sources: curseforge.com, curseforge.com (2), curseforge.com (3), curseforge.com (4), api.cfwidget.com.