Ultraborder
by Aleyz
Ultraborder is a Fabric server plugin that lets a world have one custom border shaped as a circle, a square or a set of straight diagonal walls.
What it does
Server owners set the border with the commands ub pos1 and ub pos2, which take two coordinates or use the player's current position when left blank. Walls can have finite height, bounded by two Y coordinates, or span the full world height. Changing the shape, center or radius while the server is running takes effect immediately, and a command writes the new value into the configuration file. Players with the bypass permission can cross the border freely.
Ultraborder is delivered as a Paper or Purpur server plugin, and a Fabric client mod is available as an add-on. Collision is enforced on the server in both cases. Without the client mod, players see particles as a fallback. Ultraborder requires Fabric API and runs on Fabric, Paper and Purpur, with files for 1.21 – 26.2 under the Creative Commons Attribution 4.0 license, and it is not open source.
Key features
Custom border shapes
A border can be a circle or a square with a configurable center and radius, and the walls can be freely aligned.
Diagonal and multiple walls
Straight diagonal walls can be placed in a world, and several independent walls can be defined at once.
Two-sided collision
Players are stopped by the walls from both sides, and teleports do not move them past the border.
Rendered borders on the client
The optional client mod draws the walls with the animated world-border texture, using the client's render distance rather than entity distance.
Particle fallback
Players without the client mod see particles that outline circular borders and walls, so the server-side plugin stays usable.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
How it compares
No Border is a Fabric, Forge and NeoForge mod for client and server, released under the BSD 2-Clause License and not open source, with files for 1.20.1 – 26.2. ShadowBorders is a server-side only Fabric mod under the GNU General Public License v3.0 only, with files for 1.21 – 1.21.8. Ultraborder is server-side with an optional client mod, and it is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Ultraborder | Fabric | 1.21 – 26.2 | Not published | 2026-08-16 |
| No Border | Fabric, Forge and NeoForge | 1.20.1 – 26.2 | Client and server | 2026-06-20 |
| ShadowBorders | Fabric | 1.21 – 1.21.8 | Server-side only | 2025-04-25 |
Questions
Does Ultraborder need Fabric API?
Do players have to install the client mod?
Can Ultraborder run on Paper or Purpur?
In the catalog
Ultraborder is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 13,894 mods support Minecraft 26.2.
More from Aleyz
Similar mods
What the author says
UltraBorder is a server plugin with an optional Fabric client mod. It supports circular or square world borders and freely aligned, two-sided walls. This command saves the new value to the configuration file.
Official listing
- Modrinth page
- modrinth.com/mod/ultraborder
- Owner
- Aleyz
- Published
- 2026-08-10
- Updated on Modrinth
- 2026-08-16
- Facts verified
- 2026-10-15