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// Other services

Port 9500: ismserver

Port 9500 is assigned by IANA to ismserver (ismserver).

9500

How ismserver works

Other services
client:9500ismserverresponse client:9500ismserverresponse

The client sends a request to port 9500 and the ismserver 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 9500 dangerous?

We have no specific security note for port 9500. 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 9500

ServicePortTransportDescriptionReferenceUpdated
ismserver 9500 TCP, UDP ismserver - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 9500, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9500'      # process listening on 9500
sudo lsof -nP -i :9500

macOS

sudo lsof -nP -i :9500

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9500 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9500
netstat -ano | findstr :9500

From another machine

nmap -p 9500 -sV <host>
sudo nmap -sU -p 9500 <host>
nc -zv <host> 9500

Block it in the firewall

sudo ufw deny 9500/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9500" -Direction Inbound -LocalPort 9500 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9500 used for?

Port 9500 is assigned by IANA to ismserver (ismserver).

Is port 9500 TCP or UDP?

Port 9500 is registered for TCP and UDP.

Is it safe to open port 9500?

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 9500 is open?

On Linux run "ss -ltnup 'sport = :9500'", on macOS "lsof -nP -i :9500", and on Windows "netstat -ano | findstr :9500" to see the local process. From another machine, "nmap -p 9500 <host>" shows whether it is reachable.

05 Related
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