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Network & Security Tools

Explore 27 free Network and security tools for IP, DNS, RDAP, subnet, TLS and browser diagnostics. The collection is organized for website owners, administrators and technical users and focuses on diagnosing public network information without paid APIs.

What you can do with Network & Security tools

Website owners, administrators and technical users can use these tools from their dedicated pages. Each tool includes its purpose, instructions, result guidance and links to closely related utilities.

Choose a tool by name or filter the category. For calculations, verify units and assumptions before relying on the result. For text, document, web and diagnostic tools, review generated output before using it in production, publication or formal decisions.

27 free toolsDedicated pagesMobile friendlyNo registration required
Browse by level
Levels are discovery guides, not formal academic classifications.

Calculators & Analysis

6 tools
Network & SecurityIntermediate

Internet Bandwidth Calculator

Estimate bandwidth required for users, media bitrate and concurrency.

New · usage tracking activeOpen tool →
Network & SecurityBasic

Browser Privacy Analyzer

Analyze browser privacy exposure including request data, autofill behavior, third-party account artifact protections, capabilities, WebRTC candidates and fingerprint signals.

15 uses · 6 visitors in the last yearOpen tool →
Network & SecurityIntermediate

CIDR Calculator

Use CIDR Calculator for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityBasic

Network Speed Test

Estimate browser download speed using a timed network transfer.

5 uses · 1 visitors in the last yearOpen tool →
Network & SecurityAdvanced

Subnet Calculator

Use Subnet Calculator for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityBasic

2FA TOTP Authenticator

Generate RFC 6238-style time-based one-time codes from a Base32 secret.

New · usage tracking activeOpen tool →

Checks & Diagnostics

13 tools
Network & SecurityIntermediate

ASN Lookup

Use ASN Lookup for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

DNS Lookup

Use DNS Lookup for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

Hostname Lookup

Use Hostname Lookup for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

IP Address Lookup

Use IP Address Lookup for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

IP WHOIS / RDAP Lookup

Use IP WHOIS / RDAP Lookup for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

MAC Address Vendor Lookup

Identify the likely manufacturer associated with a supported MAC address prefix.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

Reverse DNS Lookup

Use Reverse DNS Lookup for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

Screen Resolution Checker

Use Screen Resolution Checker for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

Server Headers Checker

Use Server Headers Checker for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

SSL Certificate Checker

Inspect the TLS certificate presented by a public HTTPS host.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

SSL Toolkit

Run common TLS certificate and HTTPS diagnostics for a public host.

New · usage tracking activeOpen tool →
Network & SecurityBasic

User Agent Checker

Use User Agent Checker for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

What Is My IP

Use What Is My IP for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →

Converters & Formatters

2 tools
Network & SecurityIntermediate

Domain Name Investigator

Inspect DNS and RDAP-style public information for a domain.

New · usage tracking activeOpen tool →
Network & SecurityBasic

QR Code Scanner & Reader

Scan a QR code from a camera or image and safely preview the decoded content before opening links.

New · usage tracking activeOpen tool →

Data & Reference

1 tools
Network & SecurityBasic

User Agent Parser

Parse common browser, operating-system and device hints from a user-agent string.

New · usage tracking activeOpen tool →

General Utilities

1 tools
Network & SecurityIntermediate

Browser Capabilities Detector

Report important browser APIs and feature support.

New · usage tracking activeOpen tool →

Generators & Builders

4 tools
Network & SecurityAdvanced

Password Breach Checker

Check a password against known breach hashes using the privacy-preserving k-anonymity model.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

Password Strength Test

Use Password Strength Test for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityIntermediate

PIN Generator

Use PIN Generator for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →
Network & SecurityBasic

Random IP Generator

Use Random IP Generator for network diagnostics, addressing and technical checks.

New · usage tracking activeOpen tool →