CyberHunter
Local dataset, no network
// Other services

Port 801:

Port 801 is assigned by IANA to device ().

801

How device works

Other services
client:801deviceresponse client:801deviceresponse

The client sends a request to port 801 and the device 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 801 dangerous?

We have no specific security note for port 801. 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 801

ServicePortTransportDescriptionReferenceUpdated
device 801 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 801, and is it reachable?

Linux

sudo ss -ltnup 'sport = :801'      # process listening on 801
sudo lsof -nP -i :801

macOS

sudo lsof -nP -i :801

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 801 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 801
netstat -ano | findstr :801

From another machine

nmap -p 801 -sV <host>
sudo nmap -sU -p 801 <host>
nc -zv <host> 801

Block it in the firewall

sudo ufw deny 801/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 801" -Direction Inbound -LocalPort 801 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 801 used for?

Port 801 is assigned by IANA to device ().

Is port 801 TCP or UDP?

Port 801 is registered for TCP and UDP.

Is it safe to open port 801?

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 801 is open?

On Linux run "ss -ltnup 'sport = :801'", on macOS "lsof -nP -i :801", and on Windows "netstat -ano | findstr :801" to see the local process. From another machine, "nmap -p 801 <host>" shows whether it is reachable.

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