dns-lookup

name	dns-lookup
description	DNS and domain information lookup. Use for checking DNS records (A, AAAA, MX, TXT, NS, CNAME, SOA), WHOIS data, and domain availability. Helps with domain research, troubleshooting DNS issues, and finding if a domain is registered or free.
compatibility	Requires dig, whois, and host commands (available by default on macOS and most Linux distributions).

DNS Lookup

Query DNS records, WHOIS information, and check domain availability.

Scripts

All DNS Records

./scripts/dns-records.sh <domain>

Returns all common DNS record types (A, AAAA, MX, TXT, NS, CNAME, SOA).

Specific Record Type

./scripts/dns-record.sh <domain> <type>

Query a specific record type:

• A - IPv4 address
• AAAA - IPv6 address
• MX - Mail servers
• TXT - Text records (SPF, DKIM, etc.)
• NS - Name servers
• CNAME - Canonical name (alias)
• SOA - Start of authority
• CAA - Certificate authority authorization
• SRV - Service records
• PTR - Reverse DNS

Example:

./scripts/dns-record.sh google.com MX
./scripts/dns-record.sh example.com TXT

WHOIS Lookup

./scripts/whois.sh <domain>

Returns WHOIS registration data including:

• Registrar
• Registration/expiration dates
• Name servers
• Registrant info (if not private)

Domain Availability

./scripts/available.sh <domain>

Checks if a domain is registered or available for purchase.

Bulk Availability Check

./scripts/bulk-available.sh <domain-list-file>
# or
echo -e "example1.com\nexample2.com" | ./scripts/bulk-available.sh

Check multiple domains at once.

Full Domain Report

./scripts/report.sh <domain>

Comprehensive report including:

• All DNS records
• WHOIS summary
• Name server check
• Mail server check

Examples

# Check all DNS records for a domain
./scripts/dns-records.sh github.com

# Check if a domain is available
./scripts/available.sh my-cool-startup.com

# Get WHOIS info
./scripts/whois.sh anthropic.com

# Full report
./scripts/report.sh linear.app

Common Use Cases

Task	Command
Find mail servers	./scripts/dns-record.sh domain.com MX
Check SPF/DKIM	./scripts/dns-record.sh domain.com TXT
Find who owns domain	./scripts/whois.sh domain.com
Is domain taken?	./scripts/available.sh domain.com
Debug DNS issues	./scripts/report.sh domain.com