Free Cyber Security Tools
Powerful, free security tools for reconnaissance, encoding, hashing, and network analysis. All tools run client-side in your browser no data is sent to our servers.
Recon & Intelligence
Safe reconnaissance tools using public APIs
DNS Lookup
Resolve domain names to IP addresses
Reverse DNS
Resolve IP addresses to hostnames
WHOIS Lookup
Get domain registration details
IP Geolocation
Lookup IP address location and details
Subdomain Finder
Find common subdomains for a domain
HTTP Header Analyzer
Analyze HTTP headers and technology stack
SSL/TLS Certificate Checker
Analyze SSL/TLS certificate details
Technology Detector
Detect web technologies and frameworks
Open Port Scanner
Educational port scanner (simulated)
Email Header Analyzer
Parse and analyze email headers
Encoding & Decoding
Client-side text encoding and transformation tools
Base64 Encoder/Decoder
Encode and decode Base64 strings
URL Encoder/Decoder
Encode and decode URL-safe strings
HTML Entity Encoder/Decoder
Encode and decode HTML entities
Hex Encoder/Decoder
Convert text to/from hexadecimal
JWT Decoder
Decode JSON Web Tokens
Binary/ASCII Converter
Convert between binary and ASCII text
Hashing & Cryptography
Cryptographic hashing and password tools
MD5 Hash Generator
Generate MD5 hashes (legacy, not recommended)
SHA Hash Generator
Generate SHA-1, SHA-256, SHA-512 hashes
Hash Identifier
Identify hash types and algorithms
Password Strength Checker
Evaluate password strength and entropy
Random Password Generator
Generate strong random passwords
UUID Generator
Generate unique identifiers (UUID v4)
Network & Utility
Network calculation and utility tools
Subnet Calculator
Calculate subnet masks and ranges
CIDR Notation Converter
Convert between CIDR notation and subnet masks
MAC Address Lookup
Identify MAC address manufacturer
Regex Tester
Test regular expressions
Cron Expression Parser
Decode and explain cron expressions
Timestamp Converter
Convert between Unix timestamps and dates
JSON Formatter/Validator
Format, validate, and minify JSON
User-Agent Parser
Parse and analyze User-Agent strings
Cisco & Infrastructure
Network administration and infrastructure helpers
Cisco ACL Builder
Quick Cisco Access Control List builder
Cisco Interface Description Generator
Generate standardized interface descriptions
VLAN Planning Helper
Plan VLAN assignments and IP schemes