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.