go-dig

A simple DNS lookup tool similar to Linux dig command, implemented in Go.

• Query DNS records with various record types (A, AAAA, CNAME, MX, NS, TXT, etc.)
• Support for custom DNS servers
• Short output mode for simplified results
• Reverse DNS lookup (PTR records)
• Cross-platform support (Windows/Linux)

go build -o dig main.go

dig example.com          # Query A record using system DNS
dig example.com A        # Explicitly query A record
dig example.com AAAA     # Query AAAA record
dig example.com MX       # Query MX record
dig example.com NS       # Query NS record
dig example.com TXT      # Query TXT record

dig @8.8.8.8 example.com          # Use Google's DNS
dig @1.1.1.1 example.com A        # Use Cloudflare's DNS
dig @8.8.8.8:53 example.com A     # Specify custom port

dig +short example.com          # Show only IP addresses
dig +short example.com MX       # Show MX records in short format
dig +short example.com TXT      # Show TXT records in short format

dig -x 8.8.8.8                  # Find hostname for IP
dig @8.8.8.8 -x 8.8.8.8         # Reverse lookup using specific DNS

When no DNS server is specified, go-dig will:

1. Use system configured DNS servers (Linux: /etc/resolv.conf, Windows: Get-DnsClientServerAddress)
2. Fall back to 119.29.29.29 (Chinese public DNS) if system DNS is unavailable

Shows detailed DNS response including:

• Query statistics and flags
• Question section
• Answer section
• Authority section
• Additional section
• Query time and server info

Shows only the essential record data:

• A/AAAA records: IP addresses
• CNAME records: Canonical name
• MX records: Priority and mail server
• TXT records: Text content
• NS records: Name servers
• PTR records: Hostnames

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

This is a simple educational project demonstrating DNS query implementation using miekg/dns library.