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// Other services

Port 630: RDA

Port 630 is assigned by IANA to rda (RDA).

630

How rda works

Other services
client:630rdaresponse client:630rdaresponse

The client sends a request to port 630 and the rda 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 630 dangerous?

We have no specific security note for port 630. 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 630

ServicePortTransportDescriptionReferenceUpdated
rda 630 TCP, UDP RDA - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 630, and is it reachable?

Linux

sudo ss -ltnup 'sport = :630'      # process listening on 630
sudo lsof -nP -i :630

macOS

sudo lsof -nP -i :630

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 630 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 630
netstat -ano | findstr :630

From another machine

nmap -p 630 -sV <host>
sudo nmap -sU -p 630 <host>
nc -zv <host> 630

Block it in the firewall

sudo ufw deny 630/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 630" -Direction Inbound -LocalPort 630 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 630 used for?

Port 630 is assigned by IANA to rda (RDA).

Is port 630 TCP or UDP?

Port 630 is registered for TCP and UDP.

Is it safe to open port 630?

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 630 is open?

On Linux run "ss -ltnup 'sport = :630'", on macOS "lsof -nP -i :630", and on Windows "netstat -ano | findstr :630" to see the local process. From another machine, "nmap -p 630 <host>" shows whether it is reachable.

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