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Authorized diagnostics

Port Scanner

Test a constrained list of common TCP ports on an authorized public host.

Public destination

Private, loopback, link-local, and reserved IP ranges are blocked. Crawls and responses use strict page, size, redirect, and timeout limits.

This diagnostic sends the destination to a protected server endpoint; your local files are never involved.

Result

Controlled diagnostic output will appear here.

Authorized diagnostics

What does Port Scanner do?

Checking which common ports are open helps diagnose services on a host you own or manage. This scanner tests a constrained list of common TCP ports on a public host you confirm you are authorized to test.

Scanning is performed by a server endpoint with a fixed port list, private-address blocking, and an explicit authorization check.

Test a fixed list of common TCP ports.
Requires explicit confirmation that you are authorized.
Blocks private and reserved addresses for safety.

Common use cases

Checking your own server's exposed ports
Verifying a service is reachable
Diagnosing connectivity for a host you manage

Step-by-step

How to use this tool

  1. 1

    Add content to Port Scanner

    Enter a public URL, domain, or authorized host.

  2. 2

    Configure the result

    Choose the diagnostic you need and confirm authorization where requested.

  3. 3

    Review and export

    Review the returned records, status, or response details.

Tips for a better result

  • Start with a representative sample before running a large port scanner workflow.
  • Only run network diagnostics against public systems you own or are authorized to test.
  • Review quality, compatibility, and output size before publishing or sharing the result.

Keep working

Related workflows

All Web & Network Tools Inspect public websites, DNS records, links, domains, ports, and response times.Broken Link Checker Inspect links on a public page and flag unreachable or failing destinations.Sitemap Builder Crawl a public website and compile discovered internal pages into XML.DNS Records Inspector Query public A, AAAA, MX, TXT, CNAME, and NS records for a domain.Ping Monitor Measure repeated HTTP response latency and availability for a public URL.

Learn from primary sources

Trusted references

Use these standards and official guides when you need deeper technical detail.

Google sitemap guidance (opens in a new tab)Google's guidance for discovery, crawling, and sitemap usage.ICANN RDAP information (opens in a new tab)Official information about the modern domain registration data protocol.

FAQ

Common questions

Everything you need to know before processing your files.

Only public hosts you confirm you are authorized to test; private and reserved addresses are blocked and you must accept an authorization notice.

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Privacy and measurement

Webutilia uses privacy-conscious analytics to understand page views, searches, and tool usage. You can accept or decline non-essential tracking. See the privacy policy.