CyberHunter
Local dataset, no network
// Other services

Port 16367: Network Serial Extension Ports Three

Port 16367 is assigned by IANA to netserialext3 (Network Serial Extension Ports Three).

16367

How netserialext3 works

Other services
client:16367netserialext3response client:16367netserialext3response

The client sends a request to port 16367 and the netserialext3 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 16367 dangerous?

We have no specific security note for port 16367. 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 16367

ServicePortTransportDescriptionReferenceUpdated
netserialext3 16367 TCP, UDP Network Serial Extension Ports Three - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 16367, and is it reachable?

Linux

sudo ss -ltnup 'sport = :16367'      # process listening on 16367
sudo lsof -nP -i :16367

macOS

sudo lsof -nP -i :16367

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 16367 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 16367
netstat -ano | findstr :16367

From another machine

nmap -p 16367 -sV <host>
sudo nmap -sU -p 16367 <host>
nc -zv <host> 16367

Block it in the firewall

sudo ufw deny 16367/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 16367" -Direction Inbound -LocalPort 16367 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 16367 used for?

Port 16367 is assigned by IANA to netserialext3 (Network Serial Extension Ports Three).

Is port 16367 TCP or UDP?

Port 16367 is registered for TCP and UDP.

Is it safe to open port 16367?

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 16367 is open?

On Linux run "ss -ltnup 'sport = :16367'", on macOS "lsof -nP -i :16367", and on Windows "netstat -ano | findstr :16367" to see the local process. From another machine, "nmap -p 16367 <host>" shows whether it is reachable.

05 Related
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