Port 50000: IBM Db2
Port 50000 is the conventional default listener port for IBM Db2 database connections. It is set by Db2's installer rather than assigned by IANA, and administrators can change it.
| Port number | 50000 |
|---|---|
| Service | IBM Db2 database |
| Protocol | TCP |
| Category | Databases |
| Default encryption | No |
How do I check whether port 50000 is open?
Port 50000 carries TCP, so a connection either completes its handshake or it does not, which makes the check definitive.
| Question | Command | What to know |
|---|---|---|
| Is it open on a remote host? | nc -vz example.com 50000 | A TCP handshake either completes or it does not, so netcat gives a definitive answer in one line. |
| Same check on Windows | Test-NetConnection example.com -Port 50000 | Built into PowerShell. TcpTestSucceeded in the output is the answer; telnet is not installed by default on modern Windows. |
| What is listening locally? | ss -tlnp | grep ':50000 ' | Lists the process bound to port 50000 on Linux. On macOS use lsof -nP -iTCP:50000 -sTCP:LISTEN, on Windows netstat -ano | findstr :50000 |
Replace example.com with the host you are testing. A blocked port and a port with nothing listening on it look identical from the outside, so if a service should be running, check locally before blaming the firewall.
Frequently asked questions
What is port 50000 used for?
Port 50000 is the conventional default listener port for IBM Db2 database connections. It is set by Db2's installer rather than assigned by IANA, and administrators can change it.
Is port 50000 TCP or UDP?
Port 50000 (IBM Db2) uses TCP.
Is port 50000 secure?
Port 50000 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 50000 on my firewall?
Only if you specifically need IBM Db2. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.