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Cups printing protocols

what's the difference between printing protocols.

AppSocket Protocol

The AppSocket protocol (sometimes also called the JetDirect protocol, owing to its origins with the HP JetDirect network interfaces) is the simplest, fastest, and generally the most reliable network protocol used for printers. AppSocket printing normally happens over port 9100 and uses the socket URI scheme:

socket://ip-address-or-hostname

Internet Printing Protocol (IPP)

IPP is the only protocol that CUPS supports natively and is supported by most network printers and print servers. IPP printing normally happens over port 631 and uses the http (Windows), ipp, and ipps URI schemes:

http://ip-address-or-hostname:port-number/resource

ipp://ip-address-or-hostname:port-number/resource

ipps://ip-address-or-hostname:port-number/resource

Line Printer Daemon (LPD) Protocol

LPD is the original network printing protocol and is supported by many network printers. Due to limitations in the LPD protocol, we do not recommend using it if the printer or server supports one of the other protocols. LPD printing normally happens over port 515 and uses the lpd URI scheme:

lpd://ip-address-or-hostname/queue

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