Only what you need
Opening the port list no longer downloads the cURL builder or the timestamp converter, so each page stays light.
Free Online Network Tools
Four focused tools for everyday network and server work. Each one runs on its own page so it loads fast and explains itself, whether you are debugging an API, opening a firewall port or reading a log full of epoch seconds.
IP Address Lookup
Look up an IPv4 address, an IPv6 address or a domain and see its location, organization, ASN, time zone and currency.
Open the IP lookupcURL Command Builder
Build a cURL command from a form with headers, body and proxy, then export it as Python, JavaScript, Java, Go, Rust or C#.
Open the cURL builderCommon Network Ports
Search 45 common ports by number, service name or description, from SSH and HTTPS to MySQL, Redis and Kafka.
Open the port listUnix Timestamp Converter
Turn timestamps in seconds or milliseconds into readable dates, or build a timestamp from a picked date and time.
Open the converter
What is inside
Pick the Tool for the Job
Each page keeps its own instructions and examples, so there is nothing to configure before you start.
| Tool | Use it when | Runs locally |
|---|---|---|
| IP Address Lookup | You need to know where an address or a domain points, or which network announces it | Public services |
| cURL Command Builder | You are testing an API and want the command plus ready-made client code | Yes |
| Common Network Ports | You are writing a firewall rule, a docker run command or a connection string | Yes |
| Unix Timestamp Converter | A log or an API hands you epoch seconds and you want the real date behind them | Yes |
Privacy: the cURL builder, the port reference and the timestamp converter never send what you type to a server. The IP lookup is the only tool that makes an external request, because geolocation data has to come from a public service.
Why separate pages
Small Pages, Fast Answers
Every tool loads only the script and the data it actually needs.
Its own instructions
Each tool page explains the steps, the output and the edge cases for that specific tool.
One click between tools
The navigation strip at the top of every tool page links straight to the other tools in this category.
Private by default
Everything that can run in the browser does run in the browser, with no upload and no signup.
Questions and answers
Network Tools FAQ
Are these network tools free?
Yes. Every network tool on 73hi is free to use with no signup and no daily limit.
Do the tools upload the data I enter?
No. The cURL builder, the port reference and the timestamp converter run entirely in your browser. Only the IP lookup sends the address you type to public geolocation services, because that information cannot be resolved locally.
Why is each tool on its own page?
Each tool now has a dedicated page with its own instructions, examples and FAQ, so it loads faster and is easier to find in search. The tools stay one click apart through the navigation strip at the top of every page.
Do the tools work on mobile devices?
Yes. Every tool page is responsive and works in any modern mobile browser, although very long reference tables scroll horizontally on small screens.