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// File transfer & sharing

Port 6622: Multicast FTP

Port 6622 is assigned by IANA to mcftp (Multicast FTP).

6622

How mcftp works

File transfer & sharing
client:66221/32/33/3mcftp client:66221/32/33/3mcftp

Files are sent over port 6622 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 6622 dangerous?

We have no specific security note for port 6622. 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 6622

ServicePortTransportDescriptionReferenceUpdated
mcftp 6622 TCP, UDP Multicast FTP - 2006-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 6622, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6622'      # process listening on 6622
sudo lsof -nP -i :6622

macOS

sudo lsof -nP -i :6622

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6622 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6622
netstat -ano | findstr :6622

From another machine

nmap -p 6622 -sV <host>
sudo nmap -sU -p 6622 <host>
nc -zv <host> 6622

Block it in the firewall

sudo ufw deny 6622/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6622" -Direction Inbound -LocalPort 6622 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6622 used for?

Port 6622 is assigned by IANA to mcftp (Multicast FTP).

Is port 6622 TCP or UDP?

Port 6622 is registered for TCP and UDP.

Is it safe to open port 6622?

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 6622 is open?

On Linux run "ss -ltnup 'sport = :6622'", on macOS "lsof -nP -i :6622", and on Windows "netstat -ano | findstr :6622" to see the local process. From another machine, "nmap -p 6622 <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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