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// Other services

Port 5001:

Port 5001 is assigned by IANA to commplex-link ().

5001

How commplex-link works

Other services
client:5001commplex-linkresponse client:5001commplex-linkresponse

The client sends a request to port 5001 and the commplex-link 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 5001 dangerous?

We have no specific security note for port 5001. 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 5001

ServicePortTransportDescriptionReferenceUpdated
commplex-link 5001 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5001, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5001'      # process listening on 5001
sudo lsof -nP -i :5001

macOS

sudo lsof -nP -i :5001

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5001 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5001
netstat -ano | findstr :5001

From another machine

nmap -p 5001 -sV <host>
sudo nmap -sU -p 5001 <host>
nc -zv <host> 5001

Block it in the firewall

sudo ufw deny 5001/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5001" -Direction Inbound -LocalPort 5001 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5001 used for?

Port 5001 is assigned by IANA to commplex-link ().

Is port 5001 TCP or UDP?

Port 5001 is registered for TCP and UDP.

Is it safe to open port 5001?

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 5001 is open?

On Linux run "ss -ltnup 'sport = :5001'", on macOS "lsof -nP -i :5001", and on Windows "netstat -ano | findstr :5001" to see the local process. From another machine, "nmap -p 5001 <host>" shows whether it is reachable.

05 Related
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