TCP 563
Synopsis
- TCP port 563 is the default port for NNTPS—NNTP (Usenet) over SSL/TLS.
- Major Usenet providers such as Giganews, Newshosting, UsenetServer, Astraweb, and Easynews offer secure news access on port 563.
- Popular newsreader/download clients including SABnzbd, NZBGet, Newsbin Pro, Pan, Unison, and Mozilla Thunderbird connect to those services via 563 for encrypted transfers.
- Usenet server software like InterNetNews (INN) and DNews can be configured to serve NNTPS on port 563.
- Many legacy ISP news servers also used 563 for SSL NNTP before retiring public Usenet service.
- No other common, non-Usenet uses are widely recognized for this port.
Observed activity
Last 30 days
Detailed chart