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// File transfer & sharing

Port 4573: A port for communication between a server and client for a custom backup system

Port 4573 is assigned by IANA to cardifftec-back (A port for communication between a server and client for a custom backup system).

4573

How cardifftec-back works

File transfer & sharing
client:45731/32/33/3cardifftec-back client:45731/32/33/3cardifftec-back

Files are sent over port 4573 in pieces and reassembled on the other side.

Transport
TCP
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 4573 dangerous?

We have no specific security note for port 4573. 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 4573

ServicePortTransportDescriptionReferenceUpdated
cardifftec-back 4573 TCP A port for communication between a server and client for a custom backup system - 2016-05-19
-4573-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4573, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4573'      # process listening on 4573
sudo lsof -nP -i :4573

macOS

sudo lsof -nP -i :4573

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4573 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4573
netstat -ano | findstr :4573

From another machine

nmap -p 4573 -sV <host>
nc -zv <host> 4573

Block it in the firewall

sudo ufw deny 4573/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4573" -Direction Inbound -LocalPort 4573 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4573 used for?

Port 4573 is assigned by IANA to cardifftec-back (A port for communication between a server and client for a custom backup system).

Is port 4573 TCP or UDP?

Port 4573 is registered for TCP.

Is it safe to open port 4573?

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 4573 is open?

On Linux run "ss -ltnup 'sport = :4573'", on macOS "lsof -nP -i :4573", and on Windows "netstat -ano | findstr :4573" to see the local process. From another machine, "nmap -p 4573 <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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