Subdomain Manager
by spcv_
Subdomain Manager keeps a free Minecraft server subdomain pointed at the server's current IP and port, so the address players use stays valid when the IP changes.
What it does
The mod runs a plugin on the server that watches the server's public IP address and port and updates the subdomain record to match. Players keep joining through one fixed name even when the address behind it changes, which suits home connections with dynamic IPs. Free subdomains can be used this way, and the sync runs in the background without any manual step.
The plugin is written for Bukkit-based server software and is listed for Paper, Spigot, Bukkit, Purpur, Folia, Velocity and BungeeCord. Proxy networks that often change their environment can use it to keep the entry address current. Files are published for Fabric and Forge across 46 game versions, 1.13 – 1.21.11, and the code is open source under the MIT License.
Subdomain Manager is designed for the server side, so players join without installing anything. The latest Fabric and Forge files are 1.0.0 for 1.21.11, published on 2026-03-01.
Key features
Automatic IP and port sync
The plugin checks the server's address and port and updates the subdomain whenever either one changes.
Free subdomain support
The subdomain can be a free one, so the server keeps a readable address without buying a domain.
Proxy and dynamic IP setups
Networks behind changing addresses or several proxies can keep one entry name that always points to the live server.
Compatibility
Latest build for each game version and loader.
1.21.x12 of 12 versions with builds
1.20.x7 of 7 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Home-hosted servers
A server on a residential connection with a changing IP can keep a single subdomain that players always use.
Proxy networks
Operators running several servers behind a proxy can keep the public entry address synced without manual edits.
Who it’s for: Server owners who host on dynamic IP connections or run proxy networks where the address changes often, and who want a stable subdomain without manual DNS updates.
How it compares
KmDDNS is a Fabric and NeoForge mod for 1.21.1 – 1.21.11 under the MIT License, so it covers a different loader set and version span. forge-plugin-message is a Forge plugin for 1.20.1 – 1.21.6 under the MIT License, which places it on another loader and version range. Subdomain Manager is limited to updating the subdomain record and is open source under the MIT License.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Subdomain Manager | Fabric and Forge | 1.13 – 1.21.11 | Not published | 2026-03-01 |
| KmDDNS | Fabric and NeoForge | 1.21.1 – 1.21.11 | Server-side only | 2026-03-15 |
| forge-plugin-message | Forge | 1.20.1 – 1.21.6 | Server-side only | 2025-06-26 |
Questions
Does Subdomain Manager need to be installed on the client?
Which server software does Subdomain Manager support?
Which game versions have files?
In the catalog
Subdomain Manager is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
Get free subdomains for your Minecraft server and keep them automatically updated. The SubdomainManager plugin ensures your server’s IP and port are always synced with your subdomain. This is especially useful for dynamic IP setups, proxy networks, or frequently changing environments.
Official listing
- Modrinth page
- modrinth.com/mod/subdomain-manager
- Owner
- spcv_
- Published
- 2026-03-01
- Updated on Modrinth
- 2026-03-01
- Facts verified
- 2026-10-15