Port 246

dsp3270 · TCP/UDP

RangeSystem/well-known port (0–1023)
ProtocolTCP/UDP
Servicedsp3270

Frequently asked questions

What is port 246 used for?

Port 246 is registered with the IANA for dsp3270 (TCP/UDP). Description: Display Systems Protocol.

Is port 246 a well-known port?

Yes. Port 246 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.

How do I check whether port 246 is open?

Locally on Linux with ss -tulpn | grep ':246\b', on Windows with netstat -ano | findstr :246. To test a remote host use Test-NetConnection <host> -Port 246 in PowerShell or nc -zv <host> 246 on Linux/macOS.

How do I open port 246 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 246/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=246/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 246" -Direction Inbound -Protocol TCP -LocalPort 246 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPdsp3270Display Systems Protocol
UDPdsp3270Display Systems Protocol

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