Free cybersecurity
tools.
38 utilities for DNS lookups, email security, CVE research, encoding, and network calculations.
DNS record lookup
Inspect the public DNS records behind a domain.
IPv6 lookup
Find a domain’s published AAAA records.
Nameserver lookup
Find the authoritative nameservers for a domain.
CNAME lookup
Follow a hostname’s published alias record.
TXT record lookup
Read verification and policy records.
SOA lookup
Inspect zone authority and refresh settings.
CAA lookup
See which certificate authorities a domain permits.
Mail server lookup
Find mail exchangers and their priorities.
SPF record lookup
Read the domain’s published sender policy.
DMARC record lookup
Read enforcement and reporting policy.
DKIM record lookup
Look up a known DKIM selector’s public key.
Email header inspector
Extract routing and authentication claims from pasted headers.
CVE lookup
Read a published vulnerability record by its CVE identifier.
Search query builder
Create scoped Google queries for public documentation and pages.
Certificate search
Build a certificate-transparency search for domain research.
URL inspector
Break down a URL, its parameters and encoded components.
Security header inspector
Review security headers copied from an HTTP response.
Robots.txt reader
Turn pasted crawler directives into structured data.
SHA-256 generator
Calculate a SHA-256 digest locally in your browser.
SHA-384 generator
Calculate a SHA-384 digest without uploading text.
SHA-512 generator
Generate a SHA-512 digest for a text input.
Password generator
Create random passwords using browser cryptography.
UUID generator
Generate cryptographically random version 4 identifiers.
JWT decoder
Inspect a JWT header and payload without sending the token.
Base64 encoder
Encode Unicode text as Base64.
Base64 decoder
Decode Base64 into UTF-8 text.
URL encoder
Percent-encode text for URL components.
URL decoder
Decode percent-encoded URL components.
Text to hex
Convert UTF-8 text into hexadecimal bytes.
Hex to text
Decode hexadecimal bytes into UTF-8 text.
JSON formatter
Validate and pretty-print JSON documents.
JSON minifier
Validate JSON and remove unnecessary whitespace.
Timestamp converter
Convert Unix seconds, milliseconds or ISO dates.
IOC defanger
Make links and addresses less likely to open accidentally.
IOC refanger
Restore defanged indicators as plain text.
IPv4 subnet calculator
Calculate network, broadcast, mask and address ranges.
IPv4 converter
Convert IPv4 addresses to binary, decimal and hex.
Reverse DNS lookup
Query the PTR record of an IPv4 address.
Local tools process input on your device. Public lookups send only the query to the named provider. Each tool explains where your data goes.
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