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High port (10001–65535) Medium risk Community convention

Port 25565 MINECRAFT JAVA

Quick answer

Port 25565 is the community default for Minecraft Java, using TCP.

Check and block Is it safe? Troubleshooting FAQ
TransportTCP
RiskMedium
Typical useGaming

What is port 25565 used for?

Port 25565 is widely used by Minecraft Java (TCP), a community convention rather than an IANA assignment. Default Minecraft Java Edition multiplayer server port. It sits above the registered range, where most numbers are transient client ports. A fixed high port is worth documenting precisely because tooling often assumes the default.

Ports are the transport-layer address a service listens on. A client that wants to reach Minecraft Java connects to port 25565. If nothing is listening, the connection is refused. That is why a port conflict appears whenever two processes try to bind the same number.

Use the commands below to confirm whether port 25565 is actually in use before you change firewall rules. Blocking the port stops new inbound traffic at the firewall, but it does not stop a local process from listening, and it does not remove the service from the machine.

Because this number is not IANA-assigned, a different application may legitimately use it on a machine you do not control. Always identify the actual listening process before deciding that the port belongs to this technology.

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This port number is not assigned by IANA. The entry documents a widely adopted community convention.

Check and block port 25565

Copy-ready commands for the protocols assigned to this port. Run the check first, then block only what should not be reachable.

Check on Linux

sudo ss -tlpn 'sport = :25565'

Check on Windows

Get-NetTCPConnection -LocalPort 25565 -State Listen -ErrorAction SilentlyContinue

Block with UFW

sudo ufw deny 25565/tcp

Block with iptables

sudo iptables -A INPUT -p tcp --dport 25565 -j DROP

These commands are examples for a typical host. Check the listener before you change firewall rules, and persist iptables rules with iptables-save or netfilter-persistent. On Windows, use Windows Defender Firewall or New-NetFirewallRule for persistent blocks. The iptables rules here cover IPv4; mirror them with ip6tables if IPv6 is enabled.

Is port 25565 safe to expose?

Medium

Public Minecraft servers attract scanning, bot floods and DDoS attempts. Use a whitelist, rate limiting and DDoS protection. Expose this port only when the service is actually needed. Keep it patched, prefer an encrypted alternative, and limit source addresses with a firewall allowlist.

Where port 25565 is usually used

Most traffic on port 25565 falls into these scenarios. The demo below is a safe way to confirm the listener before you change anything.

Demo

Check the game server

Minecraft Java Edition uses TCP on 25565. Bedrock Edition is a different service on UDP 19132, so a TCP probe here does not test Bedrock.

nc -vz play.example.com 25565

Common problems with port 25565

Connection refused or timed out

Refused usually means the host is reachable but nothing is listening on port 25565. A timeout more often means a firewall drop, a wrong host or a service bound to a different interface.

Port already in use

Find the process holding the port with sudo ss -tlpn 'sport = :25565' or sudo lsof -i :25565. Stop that process or configure it to bind another port; killing it without identifying it can take down a production service.

Firewall rule did not survive a reboot

UFW and Windows Firewall keep rules across restarts. Raw iptables rules do not: save them with iptables-save or the netfilter-persistent package, and re-apply after upgrades that reset the ruleset.

The port is blocked but still reachable

A firewall rule filters inbound traffic; it does not close the listener. Confirm with the check command above and bind the service to 127.0.0.1 when only local clients need it.

Port 25565 at a glance

Port number25565
Service nameMinecraft Java
Transport protocolTCP
CategoryGaming
RangeHigh port (10001–65535)
Risk levelMedium
ReferenceCommunity convention (not IANA-assigned)
Registry descriptionDefault Minecraft Java Edition multiplayer server port
SourceCommunity convention

Frequently asked questions

What is port 25565 used for?

Port 25565 (MINECRAFT JAVA) uses TCP. Default Minecraft Java Edition multiplayer server port (community convention, not an IANA assignment).

How do I check if port 25565 is open?

On Linux run `sudo ss -tlpn 'sport = :25565'`. On Windows run `Get-NetTCPConnection -LocalPort 25565 -State Listen -ErrorAction SilentlyContinue` in PowerShell. If the port is open, the output shows a process listening on port 25565; empty output usually means nothing is bound to it.

How do I block port 25565?

With UFW run `sudo ufw deny 25565/tcp`. With iptables run `sudo iptables -A INPUT -p tcp --dport 25565 -j DROP`. Persist the iptables rules with your distribution's netfilter-persistent or iptables-save tooling so they survive a reboot.

Is port 25565 safe to expose?

Public Minecraft servers attract scanning, bot floods and DDoS attempts. Use a whitelist, rate limiting and DDoS protection. Nevertheless, expose this port only when the service is actually needed. Keep it patched, prefer an encrypted alternative, and limit source addresses with a firewall allowlist.

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Primary data: IANA Service Name and Transport Protocol Port Number Registry. This number is a community convention, not an IANA assignment.

Last reviewed 2026-10-30 · Methodology · About · Privacy