Nmap relies on seven data files for port scanning and other operations, all of which have names beginning withnmap-. One example isnmap-services, a registry of port names to theircorresponding port number and protocol. The others, which this chapterdescribes one by one, are nmap-service-probes (version detection probe database),nmap-rpc (SunRPC program name to number databasefor direct RPC scanning),nmap-os-db (OS detection database),nmap-mac-prefixes (ethernet MAC address prefix(OUI) to vendor lookup table), andnmap-protocols (list of IP protocols forprotocol scan).Additionally this chapter covers certain files relatedto scripting with the Nmap Scripting Engine.The source distribution installsthese files in /usr/local/share/nmap/ and theofficial Linux RPMs put them in /usr/share/nmap/.Other distributions may install them elsewhere.