// modpack server guide
ATM10 To the Sky server hosting & setup guide
An ATM10 To the Sky server needs Java 21 and about 9.5–11 GB of RAM for up to 8 players.
A sky-world spin-off of All the Mods 10 on NeoForge 1.21.1: you start with only a tree in the void and automate your way through ATM10's tech and magic mods to the endgame.
Pack details checked by hand against All the Mods 10: To the Sky on CurseForge on October 5, 2026.
All the Mods 10: To the Sky is a NeoForge modpack for Minecraft 1.21.1 with 321 mods. We'd pick our Heavy plan (12 GB) for it.
Quick facts
| Loader | NeoForge |
|---|---|
| Minecraft versions | 1.21.1 |
| Java needed | Java 21 for Minecraft 1.21.1 Java version chart. |
| Mods | 321 modsThe number of mods CurseForge lists for the pack, client-side ones included. |
| RAM | About 8.5–9 GB for 1–3 playersBy player count. |
| Downloads | 3,479,258 on CurseForgeAs of October 5, 2026. |
| Latest version | September 21, 2026 (version 2.0.6)The newest version when we checked on October 5, 2026. |
| Official server files | Download pagePublished next to each version on CurseForge, for example ATM10SKY-2.0.6-server.zip for version 2.0.6. |
| Authors' RAM advice | The authors' performance tip is to allocate at least 6 to 8 GB of RAM.Source |
| Where to get it | All the Mods 10: To the Sky on CurseForge |
| Tags | skyblock, magic, tech |
ATM10 To the Sky server files
ATM10 To the Sky's authors publish official server files. Published next to each version on CurseForge, for example ATM10SKY-2.0.6-server.zip for version 2.0.6. 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 an ATM10 To the Sky server need?
| Players online | RAM | DSN plan |
|---|---|---|
| 1–3 players | About 8.5–9 GB | Heavy (12 GB) |
| 4–8 players | About 9.5–11 GB | Heavy (12 GB) |
| 9–15 players | About 10.5–14 GB | Heavy (12 GB) if players stay closeMore than 12 GB if they spread out. |
Estimated from 321 mods with our RAM calculator, set against the authors' own advice, not measured: low end if players stay together, high end if they spread out. What the authors say: The authors' performance tip is to allocate at least 6 to 8 GB of RAM.
With 9–15 players spread across the map, ATM10 To the Sky can need more than 12 GB, our biggest plan. A lower view distance and a pre-generated world help it fit; past that, a host with bigger plans is the better choice.
Set Java's heap (-Xmx) 10–15% under the RAM you have, about -Xmx10500M on 12 GB. NeoForge 1.21.1 reads it from user_jvm_args.txt: uncomment the -Xmx line. RAM guide.
ATM10 To the Sky server requirements
| Java | Java 21 |
|---|---|
| Loader | NeoForge for Minecraft 1.21.1 |
| CPU | Fast single-core speed (one main thread). With 321 mods, the first start takes minutes. |
| RAM | About 8.5–14 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 ATM10 To the Sky
Heavy
12 GB RAM · planned launch price $42/month
The authors suggest at least 6 to 8 GB, and with 321 mods on CurseForge's list this is a heavy pack even though a sky world starts small, so 12 GB keeps it clear of out-of-memory crashes.
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 Heavy servers open.
Heavy is our biggest plan. 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 an ATM10 To the Sky server on your own PC
What's specific to ATM10 To the Sky, 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 the
run.sh/run.batthe NeoForge 1.21.1 installer writes, then seteula=trueineula.txtif you accept Mojang's EULA (EULA step). With 321 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 ATM10 To the Sky on DSN
Once we relaunch (join the launch list), on DSN you'd install ATM10 To the Sky from the panel's CurseForge modpack installer, pick Java 21 on the Startup tab and accept the EULA in the console. No port forwarding.
How to play ATM10 To the Sky with friends
Each player installs ATM10 To the Sky with the CurseForge app or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.
Different versions of ATM10 To the Sky 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 ATM10 To the Sky
Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once ATM10 To the Sky has enough (tick lag guide). For ATM10 To the Sky:
- 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. - Chunk loaders keep machines running with nobody nearby; in a pack this size, dozens add up.
Common ATM10 To the Sky crashes
What a NeoForge 1.21.1 server running ATM10 To the Sky hits most. For any other error, paste the log into the free crash log analyzer.
- Out of memory. ATM10 To the Sky (321 mods) needs about 8.5–9 GB for 1–3 players;
java.lang.OutOfMemoryErrormeans it ran out. Out-of-memory fix. - Wrong Java version. ATM10 To the Sky 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. - 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 ATM10 To the Sky 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 ATM10 To the Sky past version 2.0.6, back up the world: see updating a modpack server without losing your world.
Bugs in ATM10 To the Sky itself go to its authors: issue tracker. Server problems on DSN: hello@dsnservers.com or Discord.
Packs like ATM10 To the Sky
More: NeoForge server hosting, all modpack guides and how to make a modded server.
Run ATM10 To the Sky on DSN when we relaunch.
Our pick, Heavy: 12 GB, planned at $42/month.
DSN Servers isn't affiliated with All the Mods 10: To the Sky 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, github.com.