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// Other services

Port 5265: 3Com Network Jack Port 2

Port 5265 is assigned by IANA to 3com-njack-2 (3Com Network Jack Port 2).

5265

How 3com-njack-2 works

Other services
client:52653com-njack-2response client:52653com-njack-2response

The client sends a request to port 5265 and the 3com-njack-2 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 5265 dangerous?

We have no specific security note for port 5265. 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 5265

ServicePortTransportDescriptionReferenceUpdated
3com-njack-2 5265 TCP, UDP 3Com Network Jack Port 2 - 2003-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 5265, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5265'      # process listening on 5265
sudo lsof -nP -i :5265

macOS

sudo lsof -nP -i :5265

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5265 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5265
netstat -ano | findstr :5265

From another machine

nmap -p 5265 -sV <host>
sudo nmap -sU -p 5265 <host>
nc -zv <host> 5265

Block it in the firewall

sudo ufw deny 5265/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5265" -Direction Inbound -LocalPort 5265 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5265 used for?

Port 5265 is assigned by IANA to 3com-njack-2 (3Com Network Jack Port 2).

Is port 5265 TCP or UDP?

Port 5265 is registered for TCP and UDP.

Is it safe to open port 5265?

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 5265 is open?

On Linux run "ss -ltnup 'sport = :5265'", on macOS "lsof -nP -i :5265", and on Windows "netstat -ano | findstr :5265" to see the local process. From another machine, "nmap -p 5265 <host>" shows whether it is reachable.

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