CyberHunter
Local dataset, no network
// Other services

Port 12004: IBM Enterprise Extender SNA COS Low Priority

Port 12004 is assigned by IANA to entextlow (IBM Enterprise Extender SNA COS Low Priority).

12004

How entextlow works

Other services
client:12004entextlowresponse client:12004entextlowresponse

The client sends a request to port 12004 and the entextlow 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 12004 dangerous?

We have no specific security note for port 12004. 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 12004

ServicePortTransportDescriptionReferenceUpdated
entextlow 12004 TCP, UDP IBM Enterprise Extender SNA COS Low Priority - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 12004, and is it reachable?

Linux

sudo ss -ltnup 'sport = :12004'      # process listening on 12004
sudo lsof -nP -i :12004

macOS

sudo lsof -nP -i :12004

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 12004 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 12004
netstat -ano | findstr :12004

From another machine

nmap -p 12004 -sV <host>
sudo nmap -sU -p 12004 <host>
nc -zv <host> 12004

Block it in the firewall

sudo ufw deny 12004/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 12004" -Direction Inbound -LocalPort 12004 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 12004 used for?

Port 12004 is assigned by IANA to entextlow (IBM Enterprise Extender SNA COS Low Priority).

Is port 12004 TCP or UDP?

Port 12004 is registered for TCP and UDP.

Is it safe to open port 12004?

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 12004 is open?

On Linux run "ss -ltnup 'sport = :12004'", on macOS "lsof -nP -i :12004", and on Windows "netstat -ano | findstr :12004" to see the local process. From another machine, "nmap -p 12004 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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