# apphelp tool profile
name: Port Lookup
tool: tool-portlookup
domain: portlookup.apphelp.net
canonical: https://portlookup.apphelp.net/en
summary: Curated TCP/UDP port reference (about 90 ports operators meet) searchable by number, range or service name, with category filters and exposure / legacy warnings.
inputs: Port number, range like 8000-9000, or a service name.
outputs: Matching ports with protocol, description, category and risk tags; range class for any number.
use-cases: firewall rules; investigate open ports; remember mail ports
keywords: port lookup, common ports, tcp udp port list, 端口号查询
languages: en, zh-CN, zh-TW, ar, de, fr
seo: locale-routed, canonical, hreflang, sitemap, robots, JSON-LD
geo: llm.txt profile, concise task summary, input/output contract, use-case list, local-first privacy notes
privacy: browser-local processing, no upload by default
limits: Not the full IANA registry.
related: https://subnetcalculator.apphelp.net/en ; https://dnslookup.apphelp.net/en ; https://macaddress.apphelp.net/en
analytics: Microsoft Clarity and Google Analytics (opt-in)
no-login: true