HTTP Header Checker – View Server Response Headers Online
Every time you visit a website, your browser and the server exchange hidden bits of information called HTTP headers. These headers tell…
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The 99tools Journal & AI Insights
Explore comprehensive tutorials, system architecture deep-dives, developer utilities, and network telemetry engineering guides.
SSL Certificate Checker – Verify SSL Status, Expiry & Chain Online
In today’s internet, SSL certificates are no longer optional—they’re essential. From search engine rankings to user trust, SSL plays a crucial role…
Port Scanner (Simulated): What It Is, When To Use It & How It Works
When you run services on a server—websites, game servers, remote desktops, or mail servers—those services listen on network ports. A port scanner…
Bandwidth Calculator: Estimate Download & Upload Time Easily
Have you ever wondered how long it will take to download a movie, upload a file, or back up data to the…
Base64 Encode/Decode Tool: Easily Convert Strings Online
If you’ve ever dealt with data transfer, file handling, or web development, you’ve likely come across Base64 encoding. It’s one of the…
Subnet Calculator: Easily Calculate Network ID, Broadcast, and Host Range
Subnetting is a term you may have heard of if you’ve ever set up IP addresses or managed a network. Network engineers,…
🕵️ Whois Lookup: Check Domain Registration Details in Seconds
Ever wondered who owns a domain name, when it was registered, or when it’s set to expire? That’s exactly what a Whois…
DNS Lookup Tool: What It Is and How to Use It
When you type a website address into your browser, magic happens in the background to take you to the right place. But…
What Is a Port Checker and How Does It Work? Beginner’s Survival Guide
Alright, let’s get real—if you’ve ever smashed your head against the wall trying to get your game server online, or wondered why…
IP Finder Tool – Instantly Find Your IP Address
Welcome to 99tools.in’s IP Finder Tool — your go-to solution for instantly checking your public IP address online. Whether you’re a tech-savvy…