Port 9100
PDL Data Stream
**Port 9100** is primarily used for printing services employing the Printer Job Language (PDL) Data Stream protocol, which facilitates fast, raw printing over TCP/IP networks. It's widely implemented on networked printers, especially those utilizing the JetDirect protocol developed by HP, enabling direct print job submissions from clients without the need for intermediary print servers or additional protocols..
Technical Details
Overview
Port 9100, often referred to as the raw printing port, forms the backbone of direct printing over TCP/IP networks. It supports Printer Job Language (PDL) streams such as PCL, PostScript, or PDF transmitted directly to printers without any protocol overhead, ensuring speed and efficiency. This printing method is particularly common in enterprise environments with many networked printers.
JetDirect Protocol
Originally popularized by Hewlett-Packard's JetDirect embedded print servers, port 9100 enables quick setup of printers on a local network. Clients open a simple TCP connection to port 9100 and push raw data directly to the print spooler within the printer's firmware. Unlike more complex protocols such as IPP or LPR/LPD, there's minimal negotiation and straightforward operation.
Compatibility and Use Cases
While JetDirect is an HP invention, many other printer manufacturers adopted this approach, making TCP port 9100 a de facto standard for direct socket printing. It is supported by most operating systems, print servers, and printer discovery/configuration utilities, allowing for wide interoperability and ease of deployment in varied environments.