ModsFinder

IPAuth

by weisrc

IPAuth restricts each user account on a server to a specific IP address, so a name can only be joined from its registered address.

FabricServer-side onlyMIT LicenseOpen source1.17

What it does

On an offline mode server, anyone can connect under any username. IPAuth ties each username to an IP address, so only the address assigned to a user can join with that name. This keeps a player from impersonating another user and taking their items or progress. The mod runs server-side only: players join without installing anything, and only the server needs the Fabric file for 1.17.

Key features

  1. Per-user IP authorization

    Each user is authorized by the IP address assigned to that username, checked when the connection is made.

  2. Protection for offline servers

    Offline mode servers gain a check that a username can only be used from its specified address.

  3. Protection against impersonation

    A player cannot take on another user's name to reach their resources from a different address.

Compatibility

Latest build for each game version and loader.

1.171
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

How it compares

Full comparison

EasyAuth Local Sessions is also a Fabric mod, released under the MIT License, with files for 1.20.1 – 1.20.6, so it covers later game versions than IPAuth. RpSessionMod is client-side only, published for 1.20.5 – 26.2 under All rights reserved, which means it does not act on the server.

ModLoadersGame versionsEnvironmentUpdated
IPAuthFabric1.17Server-side only2021-06-30
EasyAuth Local SessionsFabric1.20.1 – 1.20.6Not published2026-01-24
RpSessionModFabric1.20.5 – 26.2Client-side only2026-06-30

Questions

Does IPAuth need to be installed on the client?

No. The environment is server-side only, so players join without installing anything, and only the server runs the Fabric file for 1.17.

In the catalog

IPAuth is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 2,801 mods support Minecraft 1.17.

Utility mods36,990Fabric modsMods for 1.172,801

Similar mods

Mod Menu1.14.4 – 26.3Reese's Sodium Options1.16.5 – 26.3Jade 🔍1.16.4 – 26.3FancyMenu1.12 – 26.3Indium1.16.5 – 1.21.1Controlling1.7.10 – 26.3

What the author says

This mod adds per user IP based authorization. This mod is very useful for offline mode Minecraft servers because it ensures that a user with a username can only join from a specified IP. This avoids impersonating other users and stealing their dear resources.
weisrc, on the Modrinth page

Official listing

Owner
weisrc
Published
2021-06-30
Updated on Modrinth
2021-06-30
Facts verified
2026-10-15

Tags

Utility
Open on ModrinthCompare