Port 563

nntps · TCP/UDP

RangeSystem/well-known port (0–1023)
ProtocolTCP/UDP
Servicenntps
ReferenceRFC 4642
Modified2018-07-06

Frequently asked questions

What is port 563 used for?

Port 563 is registered with the IANA for nntps (TCP/UDP). Description: nntp protocol over TLS/SSL (was snntp).

Is port 563 a well-known port?

Yes. Port 563 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 563 is open?

Locally on Linux with ss -tulpn | grep ':563\b', on Windows with netstat -ano | findstr :563. To test a remote host use Test-NetConnection <host> -Port 563 in PowerShell or nc -zv <host> 563 on Linux/macOS.

How do I open port 563 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 563/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=563/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 563" -Direction Inbound -Protocol TCP -LocalPort 563 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPnntpsnntp protocol over TLS/SSL (was snntp)
UDPnntpsnntp protocol over TLS/SSL (was snntp)

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