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// Other services

Port 4553: ICS host services

Port 4553 is assigned by IANA to icshostsvc (ICS host services).

4553

How icshostsvc works

Other services
client:4553icshostsvcresponse client:4553icshostsvcresponse

The client sends a request to port 4553 and the icshostsvc service answers.

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
Other services
01 Security

Is port 4553 dangerous?

We have no specific security note for port 4553. 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 4553

ServicePortTransportDescriptionReferenceUpdated
icshostsvc 4553 TCP ICS host services - 2009-09-23
-4553-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4553, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4553'      # process listening on 4553
sudo lsof -nP -i :4553

macOS

sudo lsof -nP -i :4553

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4553 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4553
netstat -ano | findstr :4553

From another machine

nmap -p 4553 -sV <host>
nc -zv <host> 4553

Block it in the firewall

sudo ufw deny 4553/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4553" -Direction Inbound -LocalPort 4553 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4553 used for?

Port 4553 is assigned by IANA to icshostsvc (ICS host services).

Is port 4553 TCP or UDP?

Port 4553 is registered for TCP.

Is it safe to open port 4553?

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 4553 is open?

On Linux run "ss -ltnup 'sport = :4553'", on macOS "lsof -nP -i :4553", and on Windows "netstat -ano | findstr :4553" to see the local process. From another machine, "nmap -p 4553 <host>" shows whether it is reachable.

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