Block Blocker
by kreezxil
Block Blocker lets a server administrator stop chosen blocks from being broken or placed in the world, through a configuration file.
What it does
The mod adds an event prevention layer to the server. Its configuration has a prevent-placement section where the administrator lists block IDs that players may not place, and a separate list for blocks that may not be broken or harvested. Blocks in these lists behave as if they were unbreakable, much like bedrock, which suits hard-mode packs and servers that want fewer builds of certain materials.
Common targets include stone, gravel and sand, and blocks that crafting recipes use, where an administrator wants to limit the material supply. Placement can also be blocked for fluids such as lava sources, which stops players from building dirt towers or lava pools. The configuration is generated on the first run, already filled with examples, and changes take effect after the server restarts. Block Blocker runs on the server alone, so players join without installing anything. It is published for Fabric, Forge and NeoForge, with files covering 1.7.10 and 1.21.11, released under the MIT License and open source.
Key features
Block placement prevention
Block IDs listed in the prevent-placement section cannot be placed by players in the world.
Block breaking prevention
Listed blocks cannot be broken or harvested, so they behave like bedrock for the players.
Fluid placement control
Fluid sources, such as lava, can be blocked from being placed, which prevents large lava pools from being built.
Generated example configuration
The first run writes a configuration with example entries, which an administrator can edit and apply after a server restart.
Compatibility
Latest build for each game version and loader.
1.21.x3 of 3 versions with builds
1.20.x3 of 3 versions with builds
1.19.x3 of 3 versions with builds
1.18.x1 of 1 version with builds
1.16.x1 of 1 version with builds
1.14.x1 of 1 version with builds
1.12.x1 of 1 version with builds
1.11.x1 of 1 version with builds
1.7.x1 of 1 version with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners and modpack authors who want to restrict which blocks players can break, place or harvest. Players only need the mod when it is installed on their server.
How it compares
Network Blocker is a client-side mod for Fabric, Forge, NeoForge and Quilt, covering 1.20.1 – 26.3, released under the GNU Lesser General Public License v3.0 only. Lightning Prevention is server-side only, open source under the MIT License, and published for Fabric across 1.16.2 – 1.18.1. Block Blocker is server-side only, open source under the MIT License, and covers Fabric, Forge and NeoForge.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Block Blocker | Fabric, Forge and NeoForge | 1.7.10 – 1.21.11 | Server-side only | 2026-09-09 |
| Network Blocker | Fabric, Forge, NeoForge and Quilt | 1.20.1 – 26.3 | Client-side only | 2026-04-18 |
| Lightning Prevention | Fabric | 1.16.2 – 1.18.1 | Server-side only | 2024-05-28 |
Questions
Does Block Blocker need to be installed on the client?
How are blocked blocks changed on a running server?
Which loaders does Block Blocker support?
In the catalog
Block Blocker is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from kreezxil
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What the author says
If you want a server setup using Block Blocker with zero effort, get a server with BisectHosting and receive 25% off your first month as a new customer using the code kreezxil There are a few cases in the course of modding history where it is evident that a mechanism is required to prevent the breaking or placing of…
Official listing
- Modrinth page
- modrinth.com/mod/block-blocker
- Owner
- kreezxil
- Published
- 2022-05-26
- Updated on Modrinth
- 2026-09-09
- Facts verified
- 2026-10-15