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// Other services

Port 11600: Tempest Protocol Port

Port 11600 is assigned by IANA to tempest-port (Tempest Protocol Port).

11600

How tempest-port works

Other services
client:11600tempest-portresponse client:11600tempest-portresponse

The client sends a request to port 11600 and the tempest-port 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 11600 dangerous?

We have no specific security note for port 11600. 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 11600

ServicePortTransportDescriptionReferenceUpdated
tempest-port 11600 TCP, UDP Tempest Protocol Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 11600, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11600'      # process listening on 11600
sudo lsof -nP -i :11600

macOS

sudo lsof -nP -i :11600

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11600 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11600
netstat -ano | findstr :11600

From another machine

nmap -p 11600 -sV <host>
sudo nmap -sU -p 11600 <host>
nc -zv <host> 11600

Block it in the firewall

sudo ufw deny 11600/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11600" -Direction Inbound -LocalPort 11600 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 11600 used for?

Port 11600 is assigned by IANA to tempest-port (Tempest Protocol Port).

Is port 11600 TCP or UDP?

Port 11600 is registered for TCP and UDP.

Is it safe to open port 11600?

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 11600 is open?

On Linux run "ss -ltnup 'sport = :11600'", on macOS "lsof -nP -i :11600", and on Windows "netstat -ano | findstr :11600" to see the local process. From another machine, "nmap -p 11600 <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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