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// Other services

Port 1693: rrirtr

Port 1693 is assigned by IANA to rrirtr (rrirtr).

1693

How rrirtr works

Other services
client:1693rrirtrresponse client:1693rrirtrresponse

The client sends a request to port 1693 and the rrirtr 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 1693 dangerous?

We have no specific security note for port 1693. 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 1693

ServicePortTransportDescriptionReferenceUpdated
rrirtr 1693 TCP, UDP rrirtr - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1693, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1693'      # process listening on 1693
sudo lsof -nP -i :1693

macOS

sudo lsof -nP -i :1693

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1693 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1693
netstat -ano | findstr :1693

From another machine

nmap -p 1693 -sV <host>
sudo nmap -sU -p 1693 <host>
nc -zv <host> 1693

Block it in the firewall

sudo ufw deny 1693/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1693" -Direction Inbound -LocalPort 1693 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1693 used for?

Port 1693 is assigned by IANA to rrirtr (rrirtr).

Is port 1693 TCP or UDP?

Port 1693 is registered for TCP and UDP.

Is it safe to open port 1693?

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 1693 is open?

On Linux run "ss -ltnup 'sport = :1693'", on macOS "lsof -nP -i :1693", and on Windows "netstat -ano | findstr :1693" to see the local process. From another machine, "nmap -p 1693 <host>" shows whether it is reachable.

05 Related
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