Internet TCP port 427 is commonly used by Service Location Protocol (SLP), an Internet Engineering Task Force (IETF) standards track protocol that provides a framework to allow networking applications to discover the existence, location, and configuration of networked services in enterprise networks. Examples of software that use this protocol include Novell NetWare and Sun's Java Management Extensions (JMX). Additionally, some printer manufacturers like Xerox and Ricoh use port 427 for printer discovery and management.
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