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// Other services

Port 5639: Symantec Integrity Checking Service

Port 5639 is assigned by IANA to ics (Symantec Integrity Checking Service).

5639

How ics works

Other services
client:5639icsresponse client:5639icsresponse

The client sends a request to port 5639 and the ics 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 5639 dangerous?

We have no specific security note for port 5639. 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 5639

ServicePortTransportDescriptionReferenceUpdated
ics 5639 TCP Symantec Integrity Checking Service - 2012-05-07
-5639-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5639, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5639'      # process listening on 5639
sudo lsof -nP -i :5639

macOS

sudo lsof -nP -i :5639

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5639 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5639
netstat -ano | findstr :5639

From another machine

nmap -p 5639 -sV <host>
nc -zv <host> 5639

Block it in the firewall

sudo ufw deny 5639/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5639" -Direction Inbound -LocalPort 5639 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5639 used for?

Port 5639 is assigned by IANA to ics (Symantec Integrity Checking Service).

Is port 5639 TCP or UDP?

Port 5639 is registered for TCP.

Is it safe to open port 5639?

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 5639 is open?

On Linux run "ss -ltnup 'sport = :5639'", on macOS "lsof -nP -i :5639", and on Windows "netstat -ano | findstr :5639" to see the local process. From another machine, "nmap -p 5639 <host>" shows whether it is reachable.

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