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// Other services

Port 16368: Network Serial Extension Ports Four

Port 16368 is assigned by IANA to netserialext4 (Network Serial Extension Ports Four).

16368

How netserialext4 works

Other services
client:16368netserialext4response client:16368netserialext4response

The client sends a request to port 16368 and the netserialext4 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 16368 dangerous?

We have no specific security note for port 16368. 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 16368

ServicePortTransportDescriptionReferenceUpdated
netserialext4 16368 TCP, UDP Network Serial Extension Ports Four - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 16368, and is it reachable?

Linux

sudo ss -ltnup 'sport = :16368'      # process listening on 16368
sudo lsof -nP -i :16368

macOS

sudo lsof -nP -i :16368

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 16368 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 16368
netstat -ano | findstr :16368

From another machine

nmap -p 16368 -sV <host>
sudo nmap -sU -p 16368 <host>
nc -zv <host> 16368

Block it in the firewall

sudo ufw deny 16368/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 16368" -Direction Inbound -LocalPort 16368 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 16368 used for?

Port 16368 is assigned by IANA to netserialext4 (Network Serial Extension Ports Four).

Is port 16368 TCP or UDP?

Port 16368 is registered for TCP and UDP.

Is it safe to open port 16368?

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 16368 is open?

On Linux run "ss -ltnup 'sport = :16368'", on macOS "lsof -nP -i :16368", and on Windows "netstat -ano | findstr :16368" to see the local process. From another machine, "nmap -p 16368 <host>" shows whether it is reachable.

05 Related
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