CyberHunter
Local dataset, no network
// Other services

Port 18634: Reliable Datagram Service

Port 18634 is assigned by IANA to rds-ib (Reliable Datagram Service).

18634

How rds-ib works

Other services
client:18634rds-ibresponse client:18634rds-ibresponse

The client sends a request to port 18634 and the rds-ib 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 18634 dangerous?

We have no specific security note for port 18634. 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 18634

ServicePortTransportDescriptionReferenceUpdated
rds-ib 18634 TCP, UDP Reliable Datagram Service - 2009-02-27

// source: IANA service name and port number registry

03 Check it

Which program uses port 18634, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18634'      # process listening on 18634
sudo lsof -nP -i :18634

macOS

sudo lsof -nP -i :18634

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18634 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18634
netstat -ano | findstr :18634

From another machine

nmap -p 18634 -sV <host>
sudo nmap -sU -p 18634 <host>
nc -zv <host> 18634

Block it in the firewall

sudo ufw deny 18634/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18634" -Direction Inbound -LocalPort 18634 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 18634 used for?

Port 18634 is assigned by IANA to rds-ib (Reliable Datagram Service).

Is port 18634 TCP or UDP?

Port 18634 is registered for TCP and UDP.

Is it safe to open port 18634?

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 18634 is open?

On Linux run "ss -ltnup 'sport = :18634'", on macOS "lsof -nP -i :18634", and on Windows "netstat -ano | findstr :18634" to see the local process. From another machine, "nmap -p 18634 <host>" shows whether it is reachable.

05 Related
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