CyberHunter
Local dataset, no network
// Other services

Port 18635: Reliable Datagram Service over IP

Port 18635 is assigned by IANA to rds-ip (Reliable Datagram Service over IP).

18635

How rds-ip works

Other services
client:18635rds-ipresponse client:18635rds-ipresponse

The client sends a request to port 18635 and the rds-ip 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 18635 dangerous?

We have no specific security note for port 18635. 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 18635

ServicePortTransportDescriptionReferenceUpdated
rds-ip 18635 TCP, UDP Reliable Datagram Service over IP - 2009-05-20

// source: IANA service name and port number registry

03 Check it

Which program uses port 18635, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18635'      # process listening on 18635
sudo lsof -nP -i :18635

macOS

sudo lsof -nP -i :18635

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18635 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18635
netstat -ano | findstr :18635

From another machine

nmap -p 18635 -sV <host>
sudo nmap -sU -p 18635 <host>
nc -zv <host> 18635

Block it in the firewall

sudo ufw deny 18635/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18635" -Direction Inbound -LocalPort 18635 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 18635 used for?

Port 18635 is assigned by IANA to rds-ip (Reliable Datagram Service over IP).

Is port 18635 TCP or UDP?

Port 18635 is registered for TCP and UDP.

Is it safe to open port 18635?

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 18635 is open?

On Linux run "ss -ltnup 'sport = :18635'", on macOS "lsof -nP -i :18635", and on Windows "netstat -ano | findstr :18635" to see the local process. From another machine, "nmap -p 18635 <host>" shows whether it is reachable.

05 Related
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