CyberHunter
Local dataset, no network
// Other services

Port 200: IBM System Resource Controller

Port 200 is assigned by IANA to src (IBM System Resource Controller).

200

How src works

Other services
client:200srcresponse client:200srcresponse

The client sends a request to port 200 and the src 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 200 dangerous?

We have no specific security note for port 200. 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 200

ServicePortTransportDescriptionReferenceUpdated
src 200 TCP, UDP IBM System Resource Controller - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 200, and is it reachable?

Linux

sudo ss -ltnup 'sport = :200'      # process listening on 200
sudo lsof -nP -i :200

macOS

sudo lsof -nP -i :200

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 200 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 200
netstat -ano | findstr :200

From another machine

nmap -p 200 -sV <host>
sudo nmap -sU -p 200 <host>
nc -zv <host> 200

Block it in the firewall

sudo ufw deny 200/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 200" -Direction Inbound -LocalPort 200 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 200 used for?

Port 200 is assigned by IANA to src (IBM System Resource Controller).

Is port 200 TCP or UDP?

Port 200 is registered for TCP and UDP.

Is it safe to open port 200?

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 200 is open?

On Linux run "ss -ltnup 'sport = :200'", on macOS "lsof -nP -i :200", and on Windows "netstat -ano | findstr :200" to see the local process. From another machine, "nmap -p 200 <host>" shows whether it is reachable.

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