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// Other services

Port 3016: Notify Server

Port 3016 is assigned by IANA to notify_srvr (Notify Server), notify-srvr (Notify Server IANA assigned this well-formed service name as a replacement for "notify_srvr".).

3016

How notify_srvr works

Other services
client:3016notify_srvrresponse client:3016notify_srvrresponse

The client sends a request to port 3016 and the notify_srvr service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 3016 dangerous?

We have no specific security note for port 3016. 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 3016

ServicePortTransportDescriptionReferenceUpdated
notify_srvr 3016 TCP, UDP Notify Server - -
notify-srvr 3016 TCP, UDP Notify Server IANA assigned this well-formed service name as a replacement for "notify_srvr". - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3016, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3016'      # process listening on 3016
sudo lsof -nP -i :3016

macOS

sudo lsof -nP -i :3016

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3016 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3016
netstat -ano | findstr :3016

From another machine

nmap -p 3016 -sV <host>
sudo nmap -sU -p 3016 <host>
nc -zv <host> 3016

Block it in the firewall

sudo ufw deny 3016/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3016" -Direction Inbound -LocalPort 3016 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3016 used for?

Port 3016 is assigned by IANA to notify_srvr (Notify Server), notify-srvr (Notify Server IANA assigned this well-formed service name as a replacement for "notify_srvr".).

Is port 3016 TCP or UDP?

Port 3016 is registered for TCP and UDP.

Is it safe to open port 3016?

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 3016 is open?

On Linux run "ss -ltnup 'sport = :3016'", on macOS "lsof -nP -i :3016", and on Windows "netstat -ano | findstr :3016" to see the local process. From another machine, "nmap -p 3016 <host>" shows whether it is reachable.

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