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// Other services

Port 3893: CGI StarAPI Server

Port 3893 is assigned by IANA to cgi-starapi (CGI StarAPI Server).

3893

How cgi-starapi works

Other services
client:3893cgi-starapiresponse client:3893cgi-starapiresponse

The client sends a request to port 3893 and the cgi-starapi 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 3893 dangerous?

We have no specific security note for port 3893. 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 3893

ServicePortTransportDescriptionReferenceUpdated
cgi-starapi 3893 TCP, UDP CGI StarAPI Server - 2003-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 3893, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3893'      # process listening on 3893
sudo lsof -nP -i :3893

macOS

sudo lsof -nP -i :3893

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3893 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3893
netstat -ano | findstr :3893

From another machine

nmap -p 3893 -sV <host>
sudo nmap -sU -p 3893 <host>
nc -zv <host> 3893

Block it in the firewall

sudo ufw deny 3893/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3893" -Direction Inbound -LocalPort 3893 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3893 used for?

Port 3893 is assigned by IANA to cgi-starapi (CGI StarAPI Server).

Is port 3893 TCP or UDP?

Port 3893 is registered for TCP and UDP.

Is it safe to open port 3893?

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 3893 is open?

On Linux run "ss -ltnup 'sport = :3893'", on macOS "lsof -nP -i :3893", and on Windows "netstat -ano | findstr :3893" to see the local process. From another machine, "nmap -p 3893 <host>" shows whether it is reachable.

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