ModsFinder

LAN World Plug-n-Play (mcwifipnp)

by satxm

Players who open a singleplayer world to others use LAN World Plug-n-Play to control how joining accounts are checked, which port the world uses and whether it is mapped through UPnP.

FabricForgeNeoForgeQuiltClient or server, optionalApache License 2.0Open source1.15.2 – 26.3

What it does

The mod adds an Online Mode setting with three options. Enable checks each login against the Mojang server database, so only players signed in with a genuine Microsoft account can join. Disable accepts any login, including offline players. Disable with the UUID fixer also accepts offline players, but maps their usernames to the UUIDs Mojang has issued for those names, and keeps UUIDs for Microsoft accounts, which helps preserve backpacks and inventory contents when a world switches from Enable to Disable. Two console commands set this mode up by hand.

Beyond the login setting, the mod lets the host change the LAN world port, choose whether the port is mapped to the public internet through UPnP where the router supports it, toggle PvP, edit the server MOTD shown in the multiplayer list, and decide whether joining players receive operator rights or cheat access. Whitelist and OP lists can be managed with /whitelist, /op and /deop. Fabric API or Quilted Fabric API (QFAPI) / Quilt Standard Libraries (QSL) is required, depending on the loader.

Key features

  1. Three online mode options

    The Online Mode button selects Enable, Disable or Disable with the UUID fixer for the world.

  2. UUID fixer rules

    A rule list maps offline usernames to UUIDs, and admins edit it with /uuidfixer list, force, remove and test.

  3. Port and UPnP control

    The host sets the LAN port and can map it to the internet through UPnP, via the graphical screen or the /upnp command.

  4. PvP and MOTD settings

    Hosts toggle player-versus-player combat and change the message shown under the server name in the multiplayer list.

  5. Operator and whitelist control

    Joining players can be given OP rights or cheat access, and a whitelist limits who may enter the world.

Compatibility

Latest build for each game version and loader.

26.x5 of 5 versions with builds
26.32.1.42.1.42.1.4Not available
26.22.1.32.1.32.1.3Not available
26.1.22.0.82.0.82.0.8Not available
26.1.12.0.82.0.82.0.8Not available
26.12.0.82.0.82.0.8Not available
1.21.x12 of 12 versions with builds
1.21.112.0.82.0.82.0.8Not available
1.21.102.0.82.0.82.0.8Not available
1.21.92.0.82.0.82.0.8Not available
1.21.81.9.61.9.61.9.6Not available
1.21.71.9.61.9.61.9.6Not available
1.21.61.9.61.9.61.9.6Not available
1.21.51.9.01.9.01.9.0Not available
1.21.41.9.01.9.01.9.01.8.5
1.21.31.9.01.9.01.9.01.8.5
1.21.21.9.01.9.01.9.01.8.5
1.21.11.9.01.9.01.9.01.9.0
1.211.9.01.9.01.9.01.9.0
1.20.x7 of 7 versions with builds
1.19.x5 of 5 versions with builds
1.18.x3 of 3 versions with builds
1.17.x2 of 2 versions with builds
1.16.x4 of 4 versions with builds
1.15.x1 of 1 version with builds
ReleaseBetaAlphaNot available

This mod also publishes snapshot builds. Snapshots are not shown in the matrix.

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required

Use cases

Friends joining a singleplayer world

A host who wants friends with and without Microsoft accounts to join a LAN game can pick the online mode that fits the group.

Keeping inventories after a mode switch

A world moved from Enable to Disable can keep player backpacks and inventories with the UUID fixer option.

Who it’s for: Players who host LAN worlds for friends, and server owners who want fine control over offline and online login checks.

Questions

Which loader does LAN World Plug-n-Play need?

The mod is published for Fabric, Forge, NeoForge and Quilt. Fabric API is required on Fabric, and Quilted Fabric API (QFAPI) or Quilt Standard Libraries (QSL) is required on Quilt.

Do friends need the mod installed to join?

Either side can run it, and neither needs it, so a joining player does not need the mod to connect to a world that runs it.

What does the offline-player fix change?

With the fix enabled, offline usernames are matched to the UUIDs Mojang has issued so inventories are kept, and /uuidfixer test shows which rule applies to a name.

What the author says

1 对于正版验证按钮，现在有三个选项： - 启用：启用正版验证，将会比对Mojang服务器数据库验证登录信息，即只允许使用微软帐户登录的玩家加入； - 禁用：即不验证登录信息，允许使用离线模式登录的玩家加入； - 禁用 + 修复UUID：尝试使用离线模式登录的玩家名匹配Mojang服务器用户名称以获取唯一UUID，同时为使用微软帐户登录的用户保留UUID，它也可以防止背包和物品栏内容丢失。 - 禁用 + 修复UUID对应的控制台命令为 /onlinemode false 与 /uuidfixer enabled true 。 1 The Online Mode button has three options: …
satxm, on the Modrinth page

Official listing

Owner
satxm
Published
2021-07-21
Updated on Modrinth
2026-09-22
Facts verified
2026-10-15
Open on ModrinthCompare