Port 2728

sqdr · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicesqdr

Frequently asked questions

What is port 2728 used for?

Port 2728 is registered with the IANA for sqdr (TCP/UDP). Description: SQDR.

Is port 2728 a well-known port?

No. Port 2728 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 2728 is open?

Locally on Linux with ss -tulpn | grep ':2728\b', on Windows with netstat -ano | findstr :2728. To test a remote host use Test-NetConnection <host> -Port 2728 in PowerShell or nc -zv <host> 2728 on Linux/macOS.

How do I open port 2728 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 2728/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=2728/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 2728" -Direction Inbound -Protocol TCP -LocalPort 2728 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPsqdrSQDR
UDPsqdrSQDR

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