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Gutenprint (formerly Gimp-Print) is a collection of free-software printer drivers for use with UNIX spooling systems, such as CUPS, LPR, and LPRng.These drivers provide printing services for Unix-like systems (including Linux and macOS), RISC OS and Haiku.
CUPS uses port 631 (TCP and UDP), which is the standard IPP port, and optionally on port 515 by inetd, launchd, the Solaris Service Management Facility, or xinetd which use the cups-lpd helper program to support LPD printing.
Superscan is a tool used by system administrators, crackers and script kiddies to evaluate a computer's security. System administrators can use it to test for possible unauthorised open ports on their computer networks , whereas crackers use it to scan for insecure ports in order to gain illegal access to a system.
A printing protocol is a protocol for communication between client devices (computers, mobile phones, tablets, etc.) and printers (or print servers).It allows clients to submit one or more print jobs to the printer or print server, and perform tasks such as querying the status of a printer, obtaining the status of print jobs, or cancelling individual print jobs.
HP Universal Print Driver (UPD) is an intelligent print driver that supports a broad range of HP print devices, such as LaserJet and various MFPs. Developed by Hewlett-Packard , HP UPD combines a general purpose driver ( XPSDrv , UniDrv , or PSCRIPT ), print control, and HP proprietary extensions.
Most UDP port scanners use this scanning method, and use the absence of a response to infer that a port is open. However, if a port is blocked by a firewall, this method will falsely report that the port is open. If the port unreachable message is blocked, all ports will appear open. This method is also affected by ICMP rate limiting. [4]
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The protocol used by the printer is LPR. Note that a special URL scheme "service:" is used by the printer. "service:" URLs are not required: any URL scheme can be used, but they allow you to search for all services of the same type (e.g. all printers) regardless of the protocol that they use.