All Tools
Discover all DNS, SSL, and network tools available on ShowDNS.net. Use the search below to quickly find the tool you need.
Showing 127 of 127 tools
Converters
5 tools
Encode and decode text or data to/from Base64 format with file support
Convert Base64 encoded strings back to viewable images with preview
Convert Unix timestamps to human-readable dates and vice versa with timezone support
Convert images to Base64 encoded strings for embedding in HTML, CSS, or data URIs
Convert text to speech audio with customizable voice options and languages
DNS
20 tools
Check all DNS records for a domain in one comprehensive scan including all record types
Generate CAA records to control which certificate authorities can issue SSL/TLS certificates for your domain
Check Certificate Authority Authorization (CAA) records for SSL certificate issuance control
Find canonical name (CNAME) records for domain aliases and subdomain redirection
Check DNS cache status and TTL values across multiple DNS servers
Perform DNS queries for A, AAAA, MX, TXT, CNAME, and other DNS record types
Find and test DNS servers for a domain or IP address with performance metrics
Comprehensive DNS tools collection for record lookup, propagation checking, and domain analysis
Validate DNSSEC (DNS Security Extensions) configuration, check DNSKEY, DS, and RRSIG records
Check domain expiration dates and renewal information with expiry alerts
Full domain audit report covering DNS, DNSSEC, WHOIS, SSL/TLS, security headers, CDN, IPv6, HTTP/2 & HTTP/3, blacklists, DNS propagation and email authentication
Find mail exchange (MX) records for email server configuration and priority
Check your domain's own nameservers for responsiveness, DNSSEC status, and latency
Find nameserver (NS) records for domain delegation and DNS server configuration
Perform reverse DNS lookup to find hostname from IP address (PTR records)
Compare response times across popular public DNS resolvers like Google, Cloudflare, and Quad9
Check Start of Authority (SOA) records for domain authority and DNS zone information
Discover subdomains and analyze subdomain configurations and DNS records
Retrieve TXT records including SPF, DKIM, DMARC, and verification records
Get comprehensive domain registration information, registrar details, nameservers, and expiry dates
17 tools
Check Brand Indicators for Message Identification (BIMI) records for email branding
Generate a BIMI DNS TXT record with your brand logo and optional Verified Mark Certificate (VMC)
Check DANE TLSA records for every MX host, verify the DNSSEC chain, and match records against the live mail server certificate
Generate DANE TLSA records from a PEM certificate with real SPKI hashing computed locally in the browser
Generate DKIM keys and records for email message signing and authentication
Find DomainKeys Identified Mail (DKIM) records for email message signing and verification
Generate DMARC policy records for email authentication with policy configuration options
Check DMARC policy records for email authentication, reporting, and policy enforcement
Summarize DMARC aggregate (RUA) report XML: sending sources, SPF/DKIM alignment, volumes, and spoofing signals
Parse and analyze email headers, including SPF, DKIM and DMARC authentication results and routing information
Comprehensive email deliverability check including SPF, DKIM, DMARC, and MX records
Get recommendations and solutions to fix email deliverability problems and configuration issues
Check a domain MTA-STS policy and TLS-RPT record, validating DNS records and the live HTTPS policy file
Generate an MTA-STS policy file and the _mta-sts and TLS-RPT DNS records to enforce and monitor TLS on inbound email
Generate SPF records to authorize mail servers for your domain with visual builder
Check Sender Policy Framework (SPF) records for email authentication and mail server authorization
Validate SPF record syntax and check for configuration errors and best practices
Generators
16 tools
Generate Apache .htaccess configuration files for redirects, security, and performance
Generate secure API keys with customizable formats, lengths, and character sets
Generate various types of barcodes including UPC, Code 128, EAN, and more
Generate cron expressions for scheduled tasks with visual interface and examples
Generate sample CSV data with customizable columns, rows, and data types
Generate sample JSON data for testing and development with customizable structures
Decode JWT tokens instantly — view header, payload, claims, expiry status and signature breakdown in your browser
Generate JSON Web Tokens (JWT) with customizable headers, payload, and signatures
Generate MAC addresses for network testing, virtual machines, and device configuration with multiple formats
Generate QR codes for URLs, text, or any data with customization options and download
Generate random strings with customizable length, character sets, and patterns
Generate robots.txt files to control web crawler access and search engine indexing
Generate a valid RFC 9116 security.txt file with Contact, Expires, and every optional field, plus a deployment checklist
Encode and decode URLs online — convert special characters to percent-encoding with batch mode and encodeURIComponent or encodeURI support
Generate universally unique identifiers (UUIDs) in various formats (v1, v4)
Generate sample XML data structures for testing purposes with nested elements
Network
6 tools
Check if IP address is blacklisted across multiple DNSBL and spam databases
Find geographical location, ISP, organization, and detailed information for any IP address
Ping servers to check connectivity and measure response time with detailed statistics
Check if specific ports are open on a server or IP address with connection testing
Display your current public IP address, location, and network information
Calculate IP subnet ranges, network address, broadcast, subnet mask, wildcard mask and usable hosts from any CIDR notation
SSH & Keys
11 tools
Generate SSH configuration for Git repositories and multiple SSH keys management
Convert PEM format SSH keys to PuTTY PPK format for Windows SSH clients
Convert PuTTY PPK format SSH keys to PEM format for Linux/Mac SSH clients
Visual SSH configuration file builder for multiple hosts with advanced options
Convert SSH keys between different formats (OpenSSH, PuTTY PPK, PEM)
Calculate and analyze SSH key fingerprints with multiple algorithms (MD5, SHA256)
Generate SSH key pairs (RSA, ECDSA, Ed25519) for secure server authentication
Validate SSH key format, structure, security, and verify public/private key matching
Extract public key from private key in various formats (PEM, PPK)
SSH key management and configuration tools including key generation, conversion, and validation
Generate SSH tunnel commands for secure port forwarding and proxy setup
SSL & Security
28 tools
Verify your SSL certificate chain order, detect missing intermediate certificates and expired certs, and download a correctly-ordered bundle. Paste a PEM bundle or check a live host
Convert SSL certificates between PEM, DER, PKCS#7 (P7B) and PKCS#12 (PFX) formats securely in memory
Verify if SSL certificate matches its Certificate Signing Request (CSR)
Decode and analyze SSL certificate contents, properties, and metadata in detail
Generate X.509 certificates for SSL/TLS, CA, and code signing purposes with full customization
Verify if SSL certificate matches its private key to ensure proper key pair configuration
Search Certificate Transparency logs to find all SSL certificates ever issued for a domain — discover subdomains and check expiry status
Check and analyze Cross-Origin Resource Sharing (CORS) headers for security configuration
Generate Content Security Policy headers visually — configure directives, use presets (Strict/Moderate/WordPress), and export as HTTP header or meta tag
Validate Content Security Policy (CSP) headers for XSS protection and content restrictions
Decode Certificate Signing Request (CSR) files and view all details including subject, key type, and extensions
Generate Certificate Signing Request (CSR) for SSL certificates with customizable options
Check if your email address has been exposed in a known data breach — see compromised data types and get actionable protection steps
Generate cryptographic keys for AES, RSA, ECDSA, and HMAC algorithms
Generate hash codes and checksums for data integrity verification
Check HTTP Strict Transport Security (HSTS) header configuration and preload status
Generate Apache htpasswd file entries for HTTP authentication with multiple hash algorithms
Scan any HTTPS page for insecure HTTP resources — scripts, images, styles, and media — that trigger browser security warnings or get silently blocked.
Check SSL certificate revocation status using the Online Certificate Status Protocol (OCSP)
Generate strong, memorable passphrases from the EFF diceware wordlist with live entropy analysis
Generate secure passwords with customizable length, complexity, and character sets
Detect server software, versions, and technology stack from HTTP headers to identify information disclosure risks
Comprehensive SSL certificate analysis including validity, expiration, chain verification, TLS versions, and security assessment
Check SSL certificate expiration dates and get alerts before certificates expire
Advanced SSL/TLS security scanner with comprehensive vulnerability assessment and configuration analysis
Complete SSL certificate analysis, security headers validation, and HTTPS configuration testing tools
Check supported TLS versions and cipher suites on a server for security compliance
Check X-Frame-Options header to prevent clickjacking attacks and iframe embedding
Utilities
12 tools
Calculate age in years, months, days, or any time unit with precise calculations
Check Core Web Vitals (LCP, INP, CLS) and Lighthouse scores for any URL using Google PageSpeed Insights API with mobile and desktop testing
Validate cron expressions and analyze schedule patterns with detailed explanations
Perform date and time calculations, add/subtract time periods with timezone support
Calculate days, weeks, months, and business days between two dates with age calculator and weekday breakdown
Compare two texts or code snippets side by side with highlighted added, removed and changed lines, word-level diffs and a copyable unified diff — all in your browser
Render any page in a real browser to see which GA4, Tag Manager and legacy tags fire, the measurement hits they send, and whether consent mode is configured
Format, validate and minify JSON online with proper indentation and error detection
Check Open Graph meta tags and preview how your page looks when shared on Facebook, Twitter, and Google — get a completeness score
Test regular expressions online with real-time match highlighting, capture group inspection, replace mode and common presets
Simple stopwatch with lap time tracking functionality
Countdown timer with customizable time and alert options
Web
12 tools
Test Cross-Origin Resource Sharing (CORS) configuration and headers
Check if gzip compression is enabled and measure compression ratio for web performance
Analyze HTTP response headers for any website or URL with detailed header information
Check HTTP status codes and response details for any URL with detailed analysis
Check whether a website properly redirects HTTP traffic to HTTPS, detect redirect loops and view the redirect chain
Check whether a website supports HTTP/2 and review protocol negotiation details
Check if H3/QUIC is enabled on your website. Test HTTP/3 support and analyze Alt-Svc headers
Check security headers like CSP, HSTS, X-Frame-Options, and more with security scoring
Fetch and validate a domain security.txt file against RFC 9116 — location, syntax, required fields, expiry, and HTTPS rules
Check website redirects and status codes for any URL. Detect multi-level redirects and view final destination
Comprehensive website speed test with Lighthouse analysis, Core Web Vitals, performance scores, and actionable optimization recommendations
Test domain canonicalization between www and non-www, detect redirect chains and loops, and identify the preferred version