CyberHunter
Local dataset, no network
// Other services

Port 3768: rblcheckd server daemon

Port 3768 is assigned by IANA to rblcheckd (rblcheckd server daemon).

3768

How rblcheckd works

Other services
client:3768rblcheckdresponse client:3768rblcheckdresponse

The client sends a request to port 3768 and the rblcheckd 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 3768 dangerous?

We have no specific security note for port 3768. 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 3768

ServicePortTransportDescriptionReferenceUpdated
rblcheckd 3768 TCP, UDP rblcheckd server daemon - 2003-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 3768, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3768'      # process listening on 3768
sudo lsof -nP -i :3768

macOS

sudo lsof -nP -i :3768

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3768 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3768
netstat -ano | findstr :3768

From another machine

nmap -p 3768 -sV <host>
sudo nmap -sU -p 3768 <host>
nc -zv <host> 3768

Block it in the firewall

sudo ufw deny 3768/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3768" -Direction Inbound -LocalPort 3768 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3768 used for?

Port 3768 is assigned by IANA to rblcheckd (rblcheckd server daemon).

Is port 3768 TCP or UDP?

Port 3768 is registered for TCP and UDP.

Is it safe to open port 3768?

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 3768 is open?

On Linux run "ss -ltnup 'sport = :3768'", on macOS "lsof -nP -i :3768", and on Windows "netstat -ano | findstr :3768" to see the local process. From another machine, "nmap -p 3768 <host>" shows whether it is reachable.

05 Related
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