PortMaster

PortMaster is a fast, offline reference and trainer for TCP/UDP ports. Look up services, learn what each port is used for, and practice with quizzes—including CompTIA-style scenarios for real-world prep. Key features • Port lookup & details — Search by number, service, or protocol and view clear descriptions. • Notes — Add your own reminders to any port entry. • Favorites — Star important ports for quick access. • Quiz (Normal) — Four-choice questions drawn from the catalog; optional timer; review with correct answers. • Clean, responsive UI — Built to be readable and snappy on phones and tablets. • Works offline — No sign-in required and no connection needed. Pro upgrade (one-time) • Hard Mode (Scenario) — Real-world, CompTIA-style questions. • Question Count — Run longer sets: 25 or 50 questions. • Custom Ports — Add and remove your own port definitions. • Export Favorites — Share or save as CSV / JSON. • No ads. Works fully offline. Who it’s for • Students preparing for A+, Network+, Security+, and other IT exams. • Sysadmins, network engineers, and help-desk teams who need a quick ports reference. • Anyone who wants to memorize common ports and protocols faster. Privacy No account required. Your data stays on your device; exports are created locally only.