Definition of DNS status: NXDOMAIN, NOERROR and SERVFAIL
NXDOMAIN, NOERROR, and SERVFAIL are DNS query statuses. Understanding them helps interpret what happened when looking up domain records.
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How to install dig, host and nslookup commands on your system
If dig, host, or nslookup is missing on your Linux machine, you may have used a minimal installation on CentOS 6 or RHEL 6, or selected no packages during installation.