Blog DNS Toolbox: How to Perform a Full DNS Enumeration and Domain Research

A records

VeriSign Global Registry Services
216.87.148.114   76,578

AAAA records

NO RECORDS

MX records

Cisco Systems Ironport Division
10 mx2.delta.iphmx.com13
10 mx1.delta.iphmx.com13

NS records

VeriSign Infrastructure & Operations
a3.verisigndns.com45,845
a2.verisigndns.com45,680
a1.verisigndns.com45,909

SOA records

ttl: 10,800
email: mdnshelp@verisign.com43,726

TXT

v=spf1 a:smtp.hosts.delta.com include:_spf.vendor. Show more

CNAME records pointed here1