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// File transfer & sharing

Port 21554: MineScape Design File Server

Port 21554 is assigned by IANA to dfserver (MineScape Design File Server).

21554

How dfserver works

File transfer & sharing
client:215541/32/33/3dfserver client:215541/32/33/3dfserver

Files are sent over port 21554 in pieces and reassembled on the other side.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
File transfer & sharing
01 Security

Is port 21554 dangerous?

We have no specific security note for port 21554. Its risk depends on the program actually listening on it. General advice for file transfer & sharing services:

  • Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).
  • Disable anonymous access and restrict shares or exports to known hosts.
  • Never publish file sharing protocols to the Internet.
02 Registry

IANA registry entries for port 21554

ServicePortTransportDescriptionReferenceUpdated
dfserver 21554 TCP, UDP MineScape Design File Server - 2006-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 21554, and is it reachable?

Linux

sudo ss -ltnup 'sport = :21554'      # process listening on 21554
sudo lsof -nP -i :21554

macOS

sudo lsof -nP -i :21554

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 21554 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 21554
netstat -ano | findstr :21554

From another machine

nmap -p 21554 -sV <host>
sudo nmap -sU -p 21554 <host>
nc -zv <host> 21554

Block it in the firewall

sudo ufw deny 21554/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 21554" -Direction Inbound -LocalPort 21554 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 21554 used for?

Port 21554 is assigned by IANA to dfserver (MineScape Design File Server).

Is port 21554 TCP or UDP?

Port 21554 is registered for TCP and UDP.

Is it safe to open port 21554?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).

How do I check if port 21554 is open?

On Linux run "ss -ltnup 'sport = :21554'", on macOS "lsof -nP -i :21554", and on Windows "netstat -ano | findstr :21554" to see the local process. From another machine, "nmap -p 21554 <host>" shows whether it is reachable.

05 Related
:445 SMB tcp · udp · critical risk :21 FTP tcp · udp · sctp · high risk :139 NetBIOS Session tcp · udp · high risk :69 TFTP udp · tcp · high risk :2049 NFS tcp · udp · sctp · high risk :873 rsync tcp · udp · high risk :20 File Transfer [Default Data] tcp · udp · sctp :115 Simple File Transfer Protocol tcp · udp

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