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A powerful domain name availability checker written in Go. This tool helps you find available domain names by checking multiple registration indicators and providing detailed verification results.

• Multi-method Verification: Checks domain availability using multiple methods:
  • DNS records (NS, A, MX)
  • WHOIS information
  • SSL certificate verification
• Advanced Filtering: Filter domains using regular expressions
• Concurrent Processing: Multi-threaded domain checking with configurable worker count
• Smart Error Handling: Automatic retry mechanism for failed queries
• Detailed Results: Shows verification signatures for registered domains
• Progress Tracking: Real-time progress display with current/total count
• File Output: Saves results to separate files for available and registered domains
• Configurable Delay: Adjustable delay between queries to prevent rate limiting

git clone https://github.com/xuemian168/domain-scanner.git
cd domain-scanner
go mod download

go run main.go [options]

• -l int: Domain length (default: 3)
• -s string: Domain suffix (default: .li)
• -p string: Domain pattern:
  • d: Pure numbers (e.g., 123.li)
  • D: Pure letters (e.g., abc.li)
  • a: Alphanumeric (e.g., a1b.li)
• -r string: Regex filter for domain names
• -regex-mode string: Regex matching mode (default: full)
  • full: Match entire domain name
  • prefix: Match only domain name prefix
• -delay int: Delay between queries in milliseconds (default: 1000)
• -workers int: Number of concurrent workers (default: 10)
• -show-registered: Show registered domains in output (default: false)
• -h: Show help information

1. Check 3-letter .li domains with 20 workers:

go run main.go -l 3 -s .li -p D -workers 20

2. Check domains with custom delay and workers:

go run main.go -l 3 -s .li -p D -delay 500 -workers 15

3. Show both available and registered domains:

go run main.go -l 3 -s .li -p D -show-registered

4. Use regex filter with full domain matching:

go run main.go -l 3 -s .li -p D -r "^[a-z]{2}[0-9]$" -regex-mode full

5. Use regex filter with prefix matching:

go run main.go -l 3 -s .li -p D -r "^[a-z]{2}" -regex-mode prefix

[1/100] Domain abc.com is AVAILABLE!
[2/100] Domain xyz.com is REGISTERED [DNS_NS, WHOIS]
[3/100] Domain 123.com is REGISTERED [DNS_A, SSL]

• DNS_NS: Domain has name server records
• DNS_A: Domain has IP address records
• DNS_MX: Domain has mail server records
• WHOIS: Domain is registered according to WHOIS
• SSL: Domain has a valid SSL certificate

• Available domains: available_domains_[pattern]_[length]_[suffix].txt
• Registered domains: registered_domains_[pattern]_[length]_[suffix].txt

The tool includes robust error handling:

• Automatic retry mechanism for WHOIS queries (3 attempts)
• Timeout settings for SSL certificate checks
• Graceful handling of network issues
• Detailed error reporting

Contributions are welcome! Please feel free to submit a Pull Request.

This project is licensed under the AGPL-3.0 License - see the LICENSE file for details.

• Performance Optimizations: Significantly improved domain checking speed
  • Optimized reserved domain detection with O(1) map lookups
  • Pre-compiled regex patterns for better performance
  • Enhanced WHOIS response parsing efficiency
• Bug Fixes: Fixed WHOIS parsing for .de domains and other TLDs
• Code Quality: Refactored internal architecture for better maintainability

• Added flexible regex matching mode with -regex-mode option
• Improved domain filtering capabilities
• Enhanced error handling for regex patterns