A host uses a DNS resolver to query the closest DNS server to map a domain name to an IP address or vice versa. If the server does not have the mapping information, it will refer the resolver to other servers. The nslookup utility can be used in UNIX and Windows systems to perform name-address resolutions by supplying either a domain name or IP address.

1. Resolving a
Domain Name
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2. • Mapping a name to an address or an address to a
name is called name-address resolution.
• A host that needs to map an address to a name to an
address calls a DNS client called resolver.
• The resolver accesses the closet DNS server with a
mapping request.
• If the server has the information, it satisfies the
resolver ; otherwise , it either refers the resolvers to
other servers to provide the information.

3. • In UNIX & Windows, the nslookup utility can be
used to retrieve address/name mapping.
• If we have the domain name we get the IP address of
that domain using the nslookup utility as shown :-
$ nslookup fhda.edu
Name: fhda.edu
Address: 153.18.8.1

4. The nslookup utility can also used to retrieve the
domain name when the address is given below :-
$ nslookup 153.18.8.1
1.8.18.153.in-addr.

5. CREATED BY – RAHUL DAREDIA