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// Other services

Port 1697: rrisat

Port 1697 is assigned by IANA to rrisat (rrisat).

1697

How rrisat works

Other services
client:1697rrisatresponse client:1697rrisatresponse

The client sends a request to port 1697 and the rrisat 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 1697 dangerous?

We have no specific security note for port 1697. 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 1697

ServicePortTransportDescriptionReferenceUpdated
rrisat 1697 TCP, UDP rrisat - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1697, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1697'      # process listening on 1697
sudo lsof -nP -i :1697

macOS

sudo lsof -nP -i :1697

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1697 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1697
netstat -ano | findstr :1697

From another machine

nmap -p 1697 -sV <host>
sudo nmap -sU -p 1697 <host>
nc -zv <host> 1697

Block it in the firewall

sudo ufw deny 1697/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1697" -Direction Inbound -LocalPort 1697 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1697 used for?

Port 1697 is assigned by IANA to rrisat (rrisat).

Is port 1697 TCP or UDP?

Port 1697 is registered for TCP and UDP.

Is it safe to open port 1697?

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 1697 is open?

On Linux run "ss -ltnup 'sport = :1697'", on macOS "lsof -nP -i :1697", and on Windows "netstat -ano | findstr :1697" to see the local process. From another machine, "nmap -p 1697 <host>" shows whether it is reachable.

05 Related
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