CyberHunter
Local dataset, no network
// Other services

Port 490: micom-pfs

Port 490 is assigned by IANA to micom-pfs (micom-pfs).

490

How micom-pfs works

Other services
client:490micom-pfsresponse client:490micom-pfsresponse

The client sends a request to port 490 and the micom-pfs 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 490 dangerous?

We have no specific security note for port 490. 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 490

ServicePortTransportDescriptionReferenceUpdated
micom-pfs 490 TCP, UDP micom-pfs - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 490, and is it reachable?

Linux

sudo ss -ltnup 'sport = :490'      # process listening on 490
sudo lsof -nP -i :490

macOS

sudo lsof -nP -i :490

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 490 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 490
netstat -ano | findstr :490

From another machine

nmap -p 490 -sV <host>
sudo nmap -sU -p 490 <host>
nc -zv <host> 490

Block it in the firewall

sudo ufw deny 490/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 490" -Direction Inbound -LocalPort 490 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 490 used for?

Port 490 is assigned by IANA to micom-pfs (micom-pfs).

Is port 490 TCP or UDP?

Port 490 is registered for TCP and UDP.

Is it safe to open port 490?

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 490 is open?

On Linux run "ss -ltnup 'sport = :490'", on macOS "lsof -nP -i :490", and on Windows "netstat -ano | findstr :490" to see the local process. From another machine, "nmap -p 490 <host>" shows whether it is reachable.

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