DNS Lookup

Query and analyze DNS records for any domain.

Instructions

1. Full record lookup:

   dig example.com ANY +noall +answer
   

2. Specific record types:

   dig example.com A +short        # IPv4
   dig example.com AAAA +short     # IPv6
   dig example.com MX +short       # Mail
   dig example.com TXT +short      # TXT (SPF, DKIM, etc.)
   dig example.com CNAME +short    # Alias
   dig example.com NS +short       # Nameservers
   dig example.com SOA +short      # Authority
   

3. Propagation check (query multiple DNS servers):

   for dns in 8.8.8.8 1.1.1.1 9.9.9.9 208.67.222.222; do
     echo "$dns: $(dig @$dns example.com A +short)"
   done
   

4. Reverse DNS:

   dig -x 8.8.8.8 +short
   

5. Report format:

   🌐 DNS Report — example.com
   
   | Type  | Value | TTL |
   |-------|-------|-----|
   | A     | 93.184.216.34 | 3600 |
   | AAAA  | 2606:2800:220:1:... | 3600 |
   | MX    | 10 mail.example.com | 3600 |
   | NS    | ns1.example.com | 86400 |
   
   ## Propagation (A record)
   | DNS Server | Provider | Result | Match |
   |-----------|----------|--------|-------|
   | 8.8.8.8   | Google   | 93.184.216.34 | ✅ |
   | 1.1.1.1   | Cloudflare | 93.184.216.34 | ✅ |
   

Edge Cases

• NXDOMAIN: Domain doesn't exist — check for typos
• SERVFAIL: DNS server error — try alternate resolvers
• Low TTL during migration: Note that propagation may take up to TTL seconds
• Wildcard records: *.example.com — query specific subdomain to verify
• DNSSEC: Check with dig +dnssec if security validation needed

Requirements

• dig (from dnsutils / bind-utils) or nslookup
• Optional: whois for domain registration info
• No API keys needed