Network & IT

Network & IT Tools brings together the essential network diagnostics and information utilities that system administrators, developers, and everyday users reach for when troubleshooting connectivity, researching IP addresses, or inspecting browser details. Seven focused tools cover the most common questions: what does this IP address tell me about its location, owner, and ISP? What DNS records does this domain publish? Is that port open on that server? Who manufactured this network card? What subnet does this IP block represent? What browser am I actually using right now, and what does my user agent string reveal about my device? Four of the tools (IP Lookup, DNS Lookup, Port Checker, and MAC Address Lookup) run server-side because the operations they perform — making a network call, resolving DNS, attempting a TCP connection — cannot be done from a browser due to browser security restrictions. The server acts as a relay: it performs the lookup on your behalf and returns the result to your browser. The remaining three tools (Subnet Calculator, User Agent Parser, and What Is My Browser) run entirely in your browser with no server involvement, because subnet math and browser fingerprint detection are pure client-side operations. A word on security: the IP Lookup tool makes a call to a free third-party geo-IP service to resolve location and ISP data. The Port Checker opens a temporary TCP socket to the target host and port you specify — this is equivalent to running a telnet from our server, which means the connection appears to come from our infrastructure, not from your IP. The tool is rate-limited and restricted to common service ports only (1-1023), with a short timeout to prevent abuse. The DNS Lookup tool uses standard operating system DNS resolution on the server and caches nothing. The MAC Address Lookup queries a free OUI vendor database via a third-party API. The three client-side tools handle everyday networking calculations: the Subnet Calculator derives all properties of an IPv4 CIDR block (network address, broadcast, mask, usable range, hosts count) from just an IP and prefix, using pure JavaScript arithmetic. The User Agent Parser detects the browser, operating system, and device type from any user agent string — including the one your browser sent right now, pre-filled for instant use. What Is My Browser shows a comprehensive overview of the browser environment: name, version, screen resolution, colour depth, cookie status, JavaScript availability, language, timezone, platform, and the full user agent string, all read from the browser\u0027s navigator and screen APIs without any network requests.