Port 3543

qftest-lookup · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Serviceqftest-lookup
Registered2002-07

Frequently asked questions

What is port 3543 used for?

Port 3543 is registered with the IANA for qftest-lookup (TCP/UDP). Description: qftest Lookup Port.

Is port 3543 a well-known port?

No. Port 3543 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 3543 is open?

Locally on Linux with ss -tulpn | grep ':3543\b', on Windows with netstat -ano | findstr :3543. To test a remote host use Test-NetConnection <host> -Port 3543 in PowerShell or nc -zv <host> 3543 on Linux/macOS.

How do I open port 3543 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 3543/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3543/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3543" -Direction Inbound -Protocol TCP -LocalPort 3543 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPqftest-lookupqftest Lookup Port
UDPqftest-lookupqftest Lookup Port

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