CyberHunter
Local dataset, no network
// Other services

Port 686: Hardware Control Protocol Wismar

Port 686 is assigned by IANA to hcp-wismar (Hardware Control Protocol Wismar).

686

How hcp-wismar works

Other services
client:686hcp-wismarresponse client:686hcp-wismarresponse

The client sends a request to port 686 and the hcp-wismar 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 686 dangerous?

We have no specific security note for port 686. 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 686

ServicePortTransportDescriptionReferenceUpdated
hcp-wismar 686 TCP, UDP Hardware Control Protocol Wismar - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 686, and is it reachable?

Linux

sudo ss -ltnup 'sport = :686'      # process listening on 686
sudo lsof -nP -i :686

macOS

sudo lsof -nP -i :686

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 686 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 686
netstat -ano | findstr :686

From another machine

nmap -p 686 -sV <host>
sudo nmap -sU -p 686 <host>
nc -zv <host> 686

Block it in the firewall

sudo ufw deny 686/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 686" -Direction Inbound -LocalPort 686 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 686 used for?

Port 686 is assigned by IANA to hcp-wismar (Hardware Control Protocol Wismar).

Is port 686 TCP or UDP?

Port 686 is registered for TCP and UDP.

Is it safe to open port 686?

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 686 is open?

On Linux run "ss -ltnup 'sport = :686'", on macOS "lsof -nP -i :686", and on Windows "netstat -ano | findstr :686" to see the local process. From another machine, "nmap -p 686 <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

Latest vulnerability news

All news