CyberHunter
Local dataset, no network
// Other services

Port 3988: DCS Configuration Port

Port 3988 is assigned by IANA to dcs-config (DCS Configuration Port).

3988

How dcs-config works

Other services
client:3988dcs-configresponse client:3988dcs-configresponse

The client sends a request to port 3988 and the dcs-config 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 3988 dangerous?

We have no specific security note for port 3988. 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 3988

ServicePortTransportDescriptionReferenceUpdated
dcs-config 3988 TCP, UDP DCS Configuration Port - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 3988, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3988'      # process listening on 3988
sudo lsof -nP -i :3988

macOS

sudo lsof -nP -i :3988

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3988 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3988
netstat -ano | findstr :3988

From another machine

nmap -p 3988 -sV <host>
sudo nmap -sU -p 3988 <host>
nc -zv <host> 3988

Block it in the firewall

sudo ufw deny 3988/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3988" -Direction Inbound -LocalPort 3988 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3988 used for?

Port 3988 is assigned by IANA to dcs-config (DCS Configuration Port).

Is port 3988 TCP or UDP?

Port 3988 is registered for TCP and UDP.

Is it safe to open port 3988?

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 3988 is open?

On Linux run "ss -ltnup 'sport = :3988'", on macOS "lsof -nP -i :3988", and on Windows "netstat -ano | findstr :3988" to see the local process. From another machine, "nmap -p 3988 <host>" shows whether it is reachable.

05 Related
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