CheckHub - Free DNS Propagation Checker & Network Tools
Check DNS propagation across 20+ global resolvers in seconds. Plus 36 free WHOIS, SSL, IP, and developer tools. No ads, no tracking, no signup.
Free online DNS, network, domain, and developer tools
CheckHub provides 38 fast browser-based tools for DNS propagation, WHOIS lookups, SSL checks, HTTP headers, public IP details, encoding, formatting, and security diagnostics. All tools run client-side or via privacy-respecting serverless functions — no ads, no tracking, no signup.
DNS Tools
- DNS Propagation Checker - Check DNS propagation across global servers
- DNS Lookup - Look up DNS records for any domain
- Reverse DNS - Find hostname from IP address
- DNS Compare - Compare DNS records between two domains
- DNSSEC Checker - Verify DNSSEC configuration
- NS Lookup - Look up nameservers
- MX Lookup - Look up mail server records
- TXT Lookup - Look up TXT, SPF, DKIM, DMARC records
- Public DNS List - Browse public DNS servers worldwide
- SPF & DMARC Validator - Validate SPF and DMARC email authentication
Domain Intelligence
- WHOIS Lookup - Domain registration information
- Domain Age - Check domain age and dates
- IP Geolocation - Find IP address location
- ASN Lookup - Autonomous System Number info
- IP to Domain - Find domains on an IP
- Domain Health Score - Comprehensive domain health grade (A-F)
Network Tools
- HTTP Headers - Check HTTP response headers
- SSL Checker - Verify SSL/TLS certificate
- Website Status - Check if website is up or down
- What is My IP - Find your public IP address and location
- MAC Address Lookup - Find device manufacturer (OUI) by MAC Address
- IP Subnet Calculator - Calculate IP ranges, networks, and broadcast addresses
- Port Scanner - Scan public IP/Domain for open network ports
- Global Ping Test - Measure server latency and availability via TCP ping
Utility Tools
- Password Generator - Generate strong random passwords
- 2FA Generator - Generate Time-based OTPs from secrets
- Base64 Encode/Decode - Encode or decode Base64 strings
- URL Encode/Decode - Encode or decode URL strings
- JSON Formatter - Format, validate, and minify JSON
- Regex Tester - Test and debug regular expressions in real-time
- JWT Decoder - Decode and inspect JSON Web Tokens
- Hash Generator - Generate MD5, SHA-1, SHA-256, SHA-512 hashes
- UUID Generator - Generate and validate UUIDs (v4)
- Unix Timestamp - Convert between Unix timestamps and dates
- Cron Expression Parser - Translate cron strings and calculate next execution dates
- SSL/CSR Decoder - Decode PEM SSL certificates to view issuer and validity
- Text Diff Checker - Compare two text pieces or code blocks to highlight changes
- Image to Text (OCR) - Extract text from images locally — supports English, Vietnamese, Chinese, Japanese, Korean