E4MC Mod opens your single-player world to friends anywhere with one click. Press Open to LAN, copy the public domain that appears in chat, and your friends join from a normal Minecraft client. No port forwarding, no server rental, no router settings.
A small Minecraft: Java Edition mod that turns Open to LAN into Open to Internet, built around a public relay tunnel.
E4MC is a reverse-tunnel mod for Minecraft: Java Edition. When you open a world to LAN, it connects outward to a relay and receives a public domain such as amber-fox.eu.e4mc.link. Anyone with that domain can join as if your world were a regular server. Friends do not need the mod; only the host installs it.
Created by developer vgskye, e4mc grew from a simple LAN helper into one of Modrinth's most downloaded utilities, with more than a hundred releases across four loaders.
Remove the networking chores between "let's play" and actually playing: port rules, public IPs and firewall exceptions.
Friends who play together occasionally, modpack groups, teachers running class worlds and creators hosting quick viewer sessions.
Many players sit behind CG-NAT or shared routers where port forwarding is impossible. A relay tunnel works almost anywhere.
"For casual co-op, e4mc is the lowest-friction hosting method we have tested. One jar on the host, nothing on the guests."
E4MC is not a replacement for a 24/7 dedicated server. It is the fastest way to share a world tonight. Pair it with the user guide and you will be hosting in under five minutes.
Everything E4MC Mod does is aimed at one outcome: getting your friends into your world faster.
Open to LAN and a shareable e4mc.link address appears in chat, ready to copy.
The tunnel connects outward, so you never touch router settings or firewall rules.
Only the host installs the mod. Guests connect with an unmodified client.
Traffic routes through a relay near you to keep latency low for the whole group.
Friends connect to the relay domain, not to your home IP address.
Builds for Fabric, Quilt, Forge and NeoForge fit into almost any modpack.
A few megabytes with no settings screens and no measurable FPS impact.
Client and relay code are public under the MIT license for anyone to audit.
New Minecraft releases, including the 26.x line, get builds quickly.
E4MC Mod adds almost nothing on top of Minecraft itself. The host's upload speed matters more than raw hardware.
Every button below leads to an official source. We never rehost or repackage the jar.
Choose the file that matches your loader and Minecraft version. Operating systems: Windows, macOS and Linux, plus Android and iOS through Java Edition launchers.
Pick your platform. The steps are nearly identical everywhere because e4mc runs inside Minecraft: Java Edition.
From your first shared world to smoother sessions with bigger groups.
For modded worlds, export your instance so friends run identical content mods. Share a new domain each session, since addresses can change. Give Minecraft 6 to 8 GB of RAM for large packs, and set simulation distance to 8 or lower when four or more players are online. Use the in-game Allow Cheats toggle only for trusted groups.
Host on a wired connection, keep the domain in private chats, and back up the world before big building sessions.
| Esc | Open the pause menu and Open to LAN |
| T | Open chat to see the domain |
| Ctrl + V | Paste the domain when joining |
| Tab | Show who is connected |
| F3 | Check performance while hosting |
Five steps happen in the few seconds between clicking Start LAN World and your friend spawning next to you.
Minecraft starts its built-in LAN server on a local port.
E4MC opens an outbound QUIC connection to the nearest relay.
The relay assigns a unique e4mc.link address and shows it in chat.
The friend's client connects to the domain like any server.
Packets travel through the tunnel to the host and back.
Where E4MC Mod runs, what it works with, and the limits worth knowing before you download.
| Area | Supported | Notes |
|---|---|---|
| Operating systems | Windows 10/11, macOS, Linux | Android and iOS via Java launchers |
| Browsers | Not required to play | Any modern browser to download files |
| Devices | Desktop and laptop PCs, Macs | Phones and tablets with limited performance |
| Mod loaders | Fabric, Quilt, Forge, NeoForge | One loader per instance |
| Minecraft versions | 1.18 to 1.21.11, 26.1 to 26.2 | 1.16.5 and 1.12.2 not listed |
| Launchers | Official, Prism, Modrinth App, CurseForge | Any launcher that supports loaders |
| Friends' clients | Vanilla or modded | Must match version and content mods |
An honest look at where E4MC Mod shines and where another tool might suit you better.
Different groups, same need: getting people into one Minecraft world with no setup.
Run a shared class world for a building project without asking IT to open ports.
Jump into co-op survival with friends the moment someone says let's play.
Test your own mods in multiplayer with a teammate across town.
Host team-building sessions or community events with no server bill.
Share controlled Minecraft environments with study participants remotely.
Let viewers join a stream world for an hour without a permanent server.
See each step of an E4MC Mod session, from opening to LAN to friends spawning in. Click any image to enlarge.
The six problems players report most, and the fix that solves each one.
Minimap mods may treat each new domain as a new server, so waypoints can reset between sessions. Some school and office networks block the outbound tunnel. Worlds close for everyone when the host exits.
Allocate more RAM for big packs, add a performance mod such as Sodium on Fabric, keep render distance moderate, and restart the world if a session has run for many hours. More fixes are in our troubleshooting article.
What E4MC Mod can see, what it cannot, and how to keep your sessions private.
Avoid "e4mc" downloads from unofficial sites; repackaged jars are the real risk.
Privacy summary: the relay handles the traffic needed to connect players while your world is open. Read our privacy policy for how this website handles data.
How E4MC Mod compares with other ways to play Minecraft together online. Ratings are our editorial scores.
| Software | Price | License | OS Support | Features | Rating | Pros | Cons |
|---|---|---|---|---|---|---|---|
| E4MC Mod | Free | MIT | Win, Mac, Linux | Domain tunnel, host-only install | ★ 4.8 | Zero setup | Session-only |
| Essential Mod | Free + cosmetics | Proprietary | Win, Mac, Linux | Invites, friends list, cosmetics | ★ 4.5 | Social features | Larger install |
| World Host | Free | Open source | Win, Mac, Linux | Friends list, LAN sharing | ★ 4.3 | Friend-based | Friends need mod |
| playit.gg | Free / Premium | Proprietary | Win, Mac, Linux | Tunnel agent for any server | ★ 4.4 | Works for servers | Separate app |
| Radmin VPN | Free | Proprietary | Windows | Virtual LAN network | ★ 4.0 | Simple VPN | Everyone installs |
| ZeroTier | Free tier | Source-available | All major OS | Virtual network | ★ 4.2 | Flexible | Technical setup |
| Port forwarding | Free | N/A | Any | Direct router rule | ★ 3.6 | No middleman | Exposes IP |
Detailed head-to-heads: E4MC vs Essential Mod and E4MC vs port forwarding.
What hosts, students, teachers and creators say after using E4MC Mod.
My ISP uses CG-NAT, so port forwarding never worked. E4MC gave us a working domain on the first try. Four of us played for three hours without a single disconnect.
I test my own Fabric mod with a classmate. Being able to share a world in seconds instead of setting up a server has sped up our debugging a lot.
Works great on NeoForge 1.21.1 with a 180-mod pack. Friends still need the pack itself, which is expected. Minimap waypoints reset when the domain changes.
Our class built a city together from home. Students used the normal launcher and just pasted the address. No help desk tickets at all.
I open my world to viewers for an hour after streams. Posting the domain in chat and closing the world afterwards keeps it simple and controlled.
Took me two tries because I first downloaded the Forge file for a Fabric profile. Once I fixed that it just worked. The install guide here helped.
Straight answers to the questions players ask most, grouped into two categories.
Download E4MC Mod only from the developer's official sources: the GitHub releases page, Modrinth or CurseForge. Our download page links directly to all three. These sources host the original jar published by the developer, so you avoid repackaged files that may contain unwanted code. Never install an e4mc file from a random mirror or a video description link.
Yes. E4MC Mod is completely free and released under the MIT open-source license. There is no premium tier, no subscription and no in-game advertising. The relay network that issues your domain is also free to use for normal play sessions. You only need a legitimate copy of Minecraft: Java Edition and a supported mod loader to start hosting.
Yes. The developer publishes separate builds for Fabric, Quilt, Forge and NeoForge. Each file targets a specific loader and range of Minecraft versions, so choose the one that matches your launcher profile. Fabric and NeoForge builds cover the newest releases, while Forge builds focus on versions 1.18 to 1.20.4, which are popular for older modpacks.
Install a mod loader for your Minecraft version, download the matching e4mc jar and place it in your .minecraft/mods folder. Launch the loader profile, open any world, press Esc and choose Open to LAN. A public e4mc.link domain appears in chat. Our installation page has step-by-step instructions for Windows, macOS, Linux, Android and iOS.
No. Only the host needs E4MC Mod. Friends join by pasting the domain into Direct Connection or Add Server on a normal client. The one requirement is matching content: they must use the same Minecraft version, and if your world includes content mods such as new blocks or creatures, they need the same mods and loader too.
No. E4MC Mod is built for Minecraft: Java Edition and runs through Java mod loaders. Bedrock Edition on Windows, consoles and mobile uses a different codebase and does not support Java mods. Bedrock players who want to host friends should look at Realms or Bedrock-specific solutions instead of e4mc.
There are no official builds for 1.12.2 or 1.16.5 in the current release listings. E4MC Mod supports Minecraft 1.18 through 1.21.11 and the newer 26.x versions, depending on the loader. Be cautious of sites offering 1.12.2 files under the e4mc name, since they do not come from the developer and could be unsafe to install.
Download the newest file for your loader and game version, delete the old e4mc jar from your mods folder and place the new one inside. Launchers like Prism, the Modrinth App and CurseForge can update it for you with one click. Always update when you move to a new Minecraft version, because older builds will not load there.
Yes. The MIT license allows you to include E4MC Mod in modpacks, and many public packs on Modrinth and CurseForge already do. Keep the license notice intact and link to the official project page. Including it lets any player of your pack host a world for friends without extra setup or separate downloads.
Official E4MC Mod builds are safe. The client and relay code are open source, and files on Modrinth and CurseForge are scanned by those platforms. Your home IP address is not shown to guests because they connect through the relay domain. Minecraft's account verification also stays active, so players still need legitimate accounts to join your world.
The mod itself does not include analytics, advertising or account tracking. To connect players, the relay handles the game traffic that passes through the tunnel while your world is open to LAN. When you close the world, the tunnel closes too. Review the project's source and documentation if you need full technical details for your organisation.
Anyone who has your domain can try to connect while the world is open. Minecraft's account verification still applies, so they need a valid account. To stay private, share the domain only in private chats, close the world when you finish, and avoid posting the address publicly unless you intend to host an open session for viewers.
If chat shows only the local port, E4MC Mod did not load. The usual causes are a jar for the wrong loader, a file for a different Minecraft version, or the jar placed in another instance's folder. Open your mod list to confirm e4mc appears. Firewalls and restricted networks can also block the outbound tunnel connection.
Invalid Session comes from Minecraft's login check, not from e4mc itself. Fully close your launcher, sign out of your Microsoft account, sign back in and relaunch. Both the host and the joining player should do this. Also check that both computers show the correct date and time, since a wrong clock can break authentication.
Lag usually comes from the host's upload speed or hardware, not the relay. Host from the most powerful computer on a wired connection, lower simulation distance, allocate enough RAM and pause downloads or streams. The relay adds a small amount of latency, but sessions for small groups normally feel just like a regular server.
The domain can change each time you open the world to LAN, so share the new address at the start of every session. Saved server entries with an old domain will stop working. Some minimap mods treat each new address as a separate server, which is why waypoints may appear to reset between sessions.
Popular alternatives include Essential Mod for social features, World Host for friend-list hosting, playit.gg for tunnelling dedicated servers, and VPN-style tools like Radmin VPN or ZeroTier. Traditional port forwarding also works if your router allows it. Our comparison table breaks down price, license, platforms and trade-offs for each option.
E4MC Mod is designed for sessions while the host is playing. When the host closes the world, everyone disconnects and the domain stops working. For a server that stays online around the clock, use a dedicated Minecraft server on your own hardware or a hosting provider, optionally with a tunnel agent designed for always-on servers.
Tutorials, fixes and comparisons written by players who host with E4MC Mod every week.
Which Minecraft versions does E4MC Mod support? A clear look at 1.12.2, 1.16.5, 1.18 to 1.21.11 and the new 26.x builds by loader.
Read guidePort forwarding or E4MC Mod? See how a relay tunnel compares with opening router ports for speed, security, setup time and reliability.
Read guideE4MC Mod or Essential Mod for hosting Minecraft worlds with friends? Compare setup, who needs the mod, extra features and privacy.
Read guideQuestions about this website, corrections or partnership ideas? Reach the E4MC Mod team directly.
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Download the official jar, open to LAN and send one link.
