xnnd.com tools for dns
Domain Intelligence:

MX Lookup:
SPF Lookup:
DKIM Lookup:
DMARC Lookup:
BIMI Lookup: 
rDNS Lookup:
rDNS Scan:

Other DNS Lookup:

ABUSE.NET Lookup: 
WHOIS Lookup: 
GoogleBL Check: 
HSTS Check: 
Jumper: 
CIDR Calculator: 

Deliverability: Spam Resource | Blacklists: DNSBL Resource | Double opt-in: WombatMail
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 xnnd simple tools for dns since 2008