Port 281

personal-link · TCP/UDP

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

Frequently asked questions

What is port 281 used for?

Port 281 is registered with the IANA for personal-link (TCP/UDP). Description: Personal Link.

Is port 281 a well-known port?

Yes. Port 281 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 281 is open?

Locally on Linux with ss -tulpn | grep ':281\b', on Windows with netstat -ano | findstr :281. To test a remote host use Test-NetConnection <host> -Port 281 in PowerShell or nc -zv <host> 281 on Linux/macOS.

How do I open port 281 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 281/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=281/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 281" -Direction Inbound -Protocol TCP -LocalPort 281 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPpersonal-linkPersonal Link
UDPpersonal-linkPersonal Link

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