CyberHunter
Local dataset, no network
// Other services

Port 9990: OSM Applet Server

Port 9990 is assigned by IANA to osm-appsrvr (OSM Applet Server).

9990

How osm-appsrvr works

Other services
client:9990osm-appsrvrresponse client:9990osm-appsrvrresponse

The client sends a request to port 9990 and the osm-appsrvr 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 9990 dangerous?

We have no specific security note for port 9990. 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 9990

ServicePortTransportDescriptionReferenceUpdated
osm-appsrvr 9990 TCP, UDP OSM Applet Server - 2003-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 9990, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9990'      # process listening on 9990
sudo lsof -nP -i :9990

macOS

sudo lsof -nP -i :9990

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9990 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9990
netstat -ano | findstr :9990

From another machine

nmap -p 9990 -sV <host>
sudo nmap -sU -p 9990 <host>
nc -zv <host> 9990

Block it in the firewall

sudo ufw deny 9990/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9990" -Direction Inbound -LocalPort 9990 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9990 used for?

Port 9990 is assigned by IANA to osm-appsrvr (OSM Applet Server).

Is port 9990 TCP or UDP?

Port 9990 is registered for TCP and UDP.

Is it safe to open port 9990?

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 9990 is open?

On Linux run "ss -ltnup 'sport = :9990'", on macOS "lsof -nP -i :9990", and on Windows "netstat -ano | findstr :9990" to see the local process. From another machine, "nmap -p 9990 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news