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// Other services

Port 1811: Scientia-SDB

Port 1811 is assigned by IANA to scientia-sdb (Scientia-SDB).

1811

How scientia-sdb works

Other services
client:1811scientia-sdbresponse client:1811scientia-sdbresponse

The client sends a request to port 1811 and the scientia-sdb 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 1811 dangerous?

We have no specific security note for port 1811. 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 1811

ServicePortTransportDescriptionReferenceUpdated
scientia-sdb 1811 TCP, UDP Scientia-SDB - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1811, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1811'      # process listening on 1811
sudo lsof -nP -i :1811

macOS

sudo lsof -nP -i :1811

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1811 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1811
netstat -ano | findstr :1811

From another machine

nmap -p 1811 -sV <host>
sudo nmap -sU -p 1811 <host>
nc -zv <host> 1811

Block it in the firewall

sudo ufw deny 1811/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1811" -Direction Inbound -LocalPort 1811 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1811 used for?

Port 1811 is assigned by IANA to scientia-sdb (Scientia-SDB).

Is port 1811 TCP or UDP?

Port 1811 is registered for TCP and UDP.

Is it safe to open port 1811?

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 1811 is open?

On Linux run "ss -ltnup 'sport = :1811'", on macOS "lsof -nP -i :1811", and on Windows "netstat -ano | findstr :1811" to see the local process. From another machine, "nmap -p 1811 <host>" shows whether it is reachable.

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