Port 4045

npp · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicenpp

Frequently asked questions

What is port 4045 used for?

Port 4045 is registered with the IANA for npp (TCP/UDP). Description: Network Paging Protocol.

Is port 4045 a well-known port?

No. Port 4045 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4045 is open?

Locally on Linux with ss -tulpn | grep ':4045\b', on Windows with netstat -ano | findstr :4045. To test a remote host use Test-NetConnection <host> -Port 4045 in PowerShell or nc -zv <host> 4045 on Linux/macOS.

How do I open port 4045 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4045/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4045/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4045" -Direction Inbound -Protocol TCP -LocalPort 4045 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPnppNetwork Paging Protocol
UDPnppNetwork Paging Protocol

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