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// Other services

Port 16385: Reliable Datagram Sockets

Port 16385 is assigned by IANA to rdgs (Reliable Datagram Sockets).

16385

How rdgs works

Other services
client:16385rdgsresponse client:16385rdgsresponse

The client sends a request to port 16385 and the rdgs service answers.

Transport
TCP
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 16385 dangerous?

We have no specific security note for port 16385. 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 16385

ServicePortTransportDescriptionReferenceUpdated
rdgs 16385 TCP Reliable Datagram Sockets - 2015-04-30
-16385-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 16385, and is it reachable?

Linux

sudo ss -ltnup 'sport = :16385'      # process listening on 16385
sudo lsof -nP -i :16385

macOS

sudo lsof -nP -i :16385

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 16385 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 16385
netstat -ano | findstr :16385

From another machine

nmap -p 16385 -sV <host>
nc -zv <host> 16385

Block it in the firewall

sudo ufw deny 16385/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 16385" -Direction Inbound -LocalPort 16385 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 16385 used for?

Port 16385 is assigned by IANA to rdgs (Reliable Datagram Sockets).

Is port 16385 TCP or UDP?

Port 16385 is registered for TCP.

Is it safe to open port 16385?

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 16385 is open?

On Linux run "ss -ltnup 'sport = :16385'", on macOS "lsof -nP -i :16385", and on Windows "netstat -ano | findstr :16385" to see the local process. From another machine, "nmap -p 16385 <host>" shows whether it is reachable.

05 Related
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