CyberHunter
Local dataset, no network
// Other services

Port 1802: ConComp1

Port 1802 is assigned by IANA to concomp1 (ConComp1).

1802

How concomp1 works

Other services
client:1802concomp1response client:1802concomp1response

The client sends a request to port 1802 and the concomp1 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 1802 dangerous?

We have no specific security note for port 1802. 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 1802

ServicePortTransportDescriptionReferenceUpdated
concomp1 1802 TCP, UDP ConComp1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1802, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1802'      # process listening on 1802
sudo lsof -nP -i :1802

macOS

sudo lsof -nP -i :1802

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1802 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1802
netstat -ano | findstr :1802

From another machine

nmap -p 1802 -sV <host>
sudo nmap -sU -p 1802 <host>
nc -zv <host> 1802

Block it in the firewall

sudo ufw deny 1802/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1802" -Direction Inbound -LocalPort 1802 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1802 used for?

Port 1802 is assigned by IANA to concomp1 (ConComp1).

Is port 1802 TCP or UDP?

Port 1802 is registered for TCP and UDP.

Is it safe to open port 1802?

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 1802 is open?

On Linux run "ss -ltnup 'sport = :1802'", on macOS "lsof -nP -i :1802", and on Windows "netstat -ano | findstr :1802" to see the local process. From another machine, "nmap -p 1802 <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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