Reference database of common TCP/UDP ports with service names. Test port connectivity to your own servers.
Network Port Reference & Scanner connects two related questions: which service is commonly associated with a TCP or UDP port, and whether a server you control appears reachable on a selected port from the current browser. The reference identifies conventional service names, while the connectivity test observes what the browser can reach. The important distinction is that an assigned or familiar port name does not identify the software actually listening there. Likewise, a failed browser test does not by itself prove that the port is closed, because browser security rules, protocol expectations, firewalls, and network routing can affect the result.
The reference associates numeric port values with common service names and distinguishes TCP from UDP where relevant. TCP port 53 and UDP port 53, for example, are separate assignments even though both are associated with DNS. Treat each entry as a naming reference rather than evidence about a particular host. Administrators can configure services on different ports, and unrelated applications can listen on conventionally assigned ports.
For a server and port under your control, the scanner attempts a connection that the browser environment permits and reports the observable result. This is narrower than a packet-level TCP SYN scan and is not a general-purpose UDP probe. Input is handled in the browser rather than uploaded, but the test necessarily sends network traffic toward the specified server, where firewalls, proxies, and server logs may record it.
No. It indicates only that the attempted browser-visible connection produced a successful result. Port numbers are conventions, not authentication. A custom application, proxy, test listener, or unintended process may occupy the same port. Confirm the service separately using its expected application protocol, server configuration, and logs, especially when investigating an unexpected exposed port.
No. A browser does not provide the same raw packet access used by dedicated network scanners, so this tool cannot establish every TCP state or perform arbitrary UDP discovery. It is suited to a focused connectivity check against your own server. Use authorized network administration tools when you need packet-level behavior, range scanning, service fingerprinting, or reliable UDP analysis.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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