CyberHunter
Local dataset, no network
// Other services

Port 6801: ACNET Control System Protocol

Port 6801 is assigned by IANA to acnet (ACNET Control System Protocol).

6801

How acnet works

Other services
client:6801acnetresponse client:6801acnetresponse

The client sends a request to port 6801 and the acnet 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 6801 dangerous?

We have no specific security note for port 6801. 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 6801

ServicePortTransportDescriptionReferenceUpdated
acnet 6801 TCP, UDP ACNET Control System Protocol - 2017-07-13

// source: IANA service name and port number registry

03 Check it

Which program uses port 6801, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6801'      # process listening on 6801
sudo lsof -nP -i :6801

macOS

sudo lsof -nP -i :6801

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6801 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6801
netstat -ano | findstr :6801

From another machine

nmap -p 6801 -sV <host>
sudo nmap -sU -p 6801 <host>
nc -zv <host> 6801

Block it in the firewall

sudo ufw deny 6801/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6801" -Direction Inbound -LocalPort 6801 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6801 used for?

Port 6801 is assigned by IANA to acnet (ACNET Control System Protocol).

Is port 6801 TCP or UDP?

Port 6801 is registered for TCP and UDP.

Is it safe to open port 6801?

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 6801 is open?

On Linux run "ss -ltnup 'sport = :6801'", on macOS "lsof -nP -i :6801", and on Windows "netstat -ano | findstr :6801" to see the local process. From another machine, "nmap -p 6801 <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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