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// Other services

Port 607: nqs

Port 607 is assigned by IANA to nqs (nqs).

607

How nqs works

Other services
client:607nqsresponse client:607nqsresponse

The client sends a request to port 607 and the nqs 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 607 dangerous?

We have no specific security note for port 607. 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 607

ServicePortTransportDescriptionReferenceUpdated
nqs 607 TCP, UDP nqs - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 607, and is it reachable?

Linux

sudo ss -ltnup 'sport = :607'      # process listening on 607
sudo lsof -nP -i :607

macOS

sudo lsof -nP -i :607

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 607 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 607
netstat -ano | findstr :607

From another machine

nmap -p 607 -sV <host>
sudo nmap -sU -p 607 <host>
nc -zv <host> 607

Block it in the firewall

sudo ufw deny 607/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 607" -Direction Inbound -LocalPort 607 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 607 used for?

Port 607 is assigned by IANA to nqs (nqs).

Is port 607 TCP or UDP?

Port 607 is registered for TCP and UDP.

Is it safe to open port 607?

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 607 is open?

On Linux run "ss -ltnup 'sport = :607'", on macOS "lsof -nP -i :607", and on Windows "netstat -ano | findstr :607" to see the local process. From another machine, "nmap -p 607 <host>" shows whether it is reachable.

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