CyberHunter
Local dataset, no network
// Other services

Port 13820: DSMCC Pass-Thru Messages

Port 13820 is assigned by IANA to dsmcc-passthru (DSMCC Pass-Thru Messages).

13820

How dsmcc-passthru works

Other services
client:13820dsmcc-passthruresponse client:13820dsmcc-passthruresponse

The client sends a request to port 13820 and the dsmcc-passthru 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 13820 dangerous?

We have no specific security note for port 13820. 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 13820

ServicePortTransportDescriptionReferenceUpdated
dsmcc-passthru 13820 TCP, UDP DSMCC Pass-Thru Messages ISO/IEC 13818-6 MPEG-2 DSM-CC -

// source: IANA service name and port number registry

03 Check it

Which program uses port 13820, and is it reachable?

Linux

sudo ss -ltnup 'sport = :13820'      # process listening on 13820
sudo lsof -nP -i :13820

macOS

sudo lsof -nP -i :13820

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 13820 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 13820
netstat -ano | findstr :13820

From another machine

nmap -p 13820 -sV <host>
sudo nmap -sU -p 13820 <host>
nc -zv <host> 13820

Block it in the firewall

sudo ufw deny 13820/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 13820" -Direction Inbound -LocalPort 13820 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 13820 used for?

Port 13820 is assigned by IANA to dsmcc-passthru (DSMCC Pass-Thru Messages).

Is port 13820 TCP or UDP?

Port 13820 is registered for TCP and UDP.

Is it safe to open port 13820?

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 13820 is open?

On Linux run "ss -ltnup 'sport = :13820'", on macOS "lsof -nP -i :13820", and on Windows "netstat -ano | findstr :13820" to see the local process. From another machine, "nmap -p 13820 <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

Latest vulnerability news

All news