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// Other services

Port 4555: RSIP Port

Port 4555 is assigned by IANA to rsip (RSIP Port).

4555

How rsip works

Other services
client:4555rsipresponse client:4555rsipresponse

The client sends a request to port 4555 and the rsip service answers.

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
Other services
01 Security

Is port 4555 dangerous?

We have no specific security note for port 4555. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 4555

ServicePortTransportDescriptionReferenceUpdated
rsip 4555 TCP, UDP RSIP Port RFC 3103 -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4555, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4555'      # process listening on 4555
sudo lsof -nP -i :4555

macOS

sudo lsof -nP -i :4555

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4555 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4555
netstat -ano | findstr :4555

From another machine

nmap -p 4555 -sV <host>
sudo nmap -sU -p 4555 <host>
nc -zv <host> 4555

Block it in the firewall

sudo ufw deny 4555/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4555" -Direction Inbound -LocalPort 4555 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4555 used for?

Port 4555 is assigned by IANA to rsip (RSIP Port).

Is port 4555 TCP or UDP?

Port 4555 is registered for TCP and UDP.

Is it safe to open port 4555?

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. Close the port if nothing on the host needs it.

How do I check if port 4555 is open?

On Linux run "ss -ltnup 'sport = :4555'", on macOS "lsof -nP -i :4555", and on Windows "netstat -ano | findstr :4555" to see the local process. From another machine, "nmap -p 4555 <host>" shows whether it is reachable.

05 Related
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