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// Other services

Port 1620: faxportwinport

Port 1620 is assigned by IANA to faxportwinport (faxportwinport).

1620

How faxportwinport works

Other services
client:1620faxportwinportresponse client:1620faxportwinportresponse

The client sends a request to port 1620 and the faxportwinport 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 1620 dangerous?

We have no specific security note for port 1620. 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 1620

ServicePortTransportDescriptionReferenceUpdated
faxportwinport 1620 TCP, UDP faxportwinport - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1620, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1620'      # process listening on 1620
sudo lsof -nP -i :1620

macOS

sudo lsof -nP -i :1620

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1620 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1620
netstat -ano | findstr :1620

From another machine

nmap -p 1620 -sV <host>
sudo nmap -sU -p 1620 <host>
nc -zv <host> 1620

Block it in the firewall

sudo ufw deny 1620/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1620" -Direction Inbound -LocalPort 1620 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1620 used for?

Port 1620 is assigned by IANA to faxportwinport (faxportwinport).

Is port 1620 TCP or UDP?

Port 1620 is registered for TCP and UDP.

Is it safe to open port 1620?

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 1620 is open?

On Linux run "ss -ltnup 'sport = :1620'", on macOS "lsof -nP -i :1620", and on Windows "netstat -ano | findstr :1620" to see the local process. From another machine, "nmap -p 1620 <host>" shows whether it is reachable.

05 Related
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