DNS lookup
It stands for domain name
server. It is basically a resource for converting friendly hostnames (like
google.com) which humans can easily understand into IP addresses that machine needs to
communicate to the host. When you type www.google.com in the location bar of browser, the browser
performs a DNS lookup or search to find the machine-readable IP address so that
it can communicate with the host. This means the browser cannot communicate
with a host without the IP address. Hence in order to perform the DNS lookup, the
browser contact the DNS server through your IPS and looks for the IP conversion
of the hostname it wants to contact.
The server on which the browser first
looks for a hostname to IP translation is the primary server DNS server. If
this doesn’t show match, then it contact to secondary DNS server. If a match is
found in secondary DNS server, then the primary server updates its database. So
that it doesn’t have to contact the secondary server again for the same match.
DNS lookup is simply the process of
converting the human-understandable hostnames into the machine-understandable
.Thus you can say that a DNS look up convert a hostname into an IP addresses.
REVERSE DNS LOOKUP
It is a simply convert
machine-understandable IP address into its human-understandable hostname.
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