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// Other services

Port 186: KIS Protocol

Port 186 is assigned by IANA to kis (KIS Protocol).

186

How kis works

Other services
client:186kisresponse client:186kisresponse

The client sends a request to port 186 and the kis 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 186 dangerous?

We have no specific security note for port 186. 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 186

ServicePortTransportDescriptionReferenceUpdated
kis 186 TCP, UDP KIS Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 186, and is it reachable?

Linux

sudo ss -ltnup 'sport = :186'      # process listening on 186
sudo lsof -nP -i :186

macOS

sudo lsof -nP -i :186

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 186 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 186
netstat -ano | findstr :186

From another machine

nmap -p 186 -sV <host>
sudo nmap -sU -p 186 <host>
nc -zv <host> 186

Block it in the firewall

sudo ufw deny 186/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 186" -Direction Inbound -LocalPort 186 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 186 used for?

Port 186 is assigned by IANA to kis (KIS Protocol).

Is port 186 TCP or UDP?

Port 186 is registered for TCP and UDP.

Is it safe to open port 186?

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 186 is open?

On Linux run "ss -ltnup 'sport = :186'", on macOS "lsof -nP -i :186", and on Windows "netstat -ano | findstr :186" to see the local process. From another machine, "nmap -p 186 <host>" shows whether it is reachable.

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