xnnd.com tools for dns
Domain Intelligence:

MX Lookup:
SPF Lookup:
DMARC Lookup:
rDNS Lookup:
rDNS Scan:

Other DNS Lookup:

ABUSE.NET Lookup: 
WHOIS Lookup: 
HSTS Check: 
SNDS Lookup: 
CIDR Calculator: 

For more information on spam, deliverability and blacklists,
visit Spam Resource and DNSBL Resource
Need more tools? Check out wiseTools
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 xnnd simple tools for dns by al iverson since 2008