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// Other services

Port 3167: Now Contact Public Server

Port 3167 is assigned by IANA to nowcontact (Now Contact Public Server).

3167

How nowcontact works

Other services
client:3167nowcontactresponse client:3167nowcontactresponse

The client sends a request to port 3167 and the nowcontact 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 3167 dangerous?

We have no specific security note for port 3167. 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 3167

ServicePortTransportDescriptionReferenceUpdated
nowcontact 3167 TCP, UDP Now Contact Public Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3167, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3167'      # process listening on 3167
sudo lsof -nP -i :3167

macOS

sudo lsof -nP -i :3167

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3167 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3167
netstat -ano | findstr :3167

From another machine

nmap -p 3167 -sV <host>
sudo nmap -sU -p 3167 <host>
nc -zv <host> 3167

Block it in the firewall

sudo ufw deny 3167/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3167" -Direction Inbound -LocalPort 3167 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3167 used for?

Port 3167 is assigned by IANA to nowcontact (Now Contact Public Server).

Is port 3167 TCP or UDP?

Port 3167 is registered for TCP and UDP.

Is it safe to open port 3167?

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 3167 is open?

On Linux run "ss -ltnup 'sport = :3167'", on macOS "lsof -nP -i :3167", and on Windows "netstat -ano | findstr :3167" to see the local process. From another machine, "nmap -p 3167 <host>" shows whether it is reachable.

05 Related
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