<s>
host	O
is	O
a	O
simple	O
utility	O
for	O
performing	O
Domain	B-Protocol
Name	I-Protocol
System	I-Protocol
lookups	O
.	O
</s>
<s>
It	O
was	O
developed	O
by	O
the	O
Internet	O
Systems	O
Consortium	O
(	O
ISC	O
)	O
,	O
and	O
is	O
released	O
under	O
the	O
Mozilla	B-License
Public	I-License
License	I-License
2.0	I-License
.	O
</s>
<s>
When	O
applied	O
to	O
a	O
fully	B-Protocol
qualified	I-Protocol
domain	I-Protocol
name	I-Protocol
(	O
FQDN	B-Protocol
)	O
the	O
host	O
command	B-Application
will	O
return	O
information	O
associated	O
with	O
that	O
name	O
such	O
as	O
its	O
IP	B-Protocol
address	I-Protocol
and	O
mail	O
handling	O
host	O
.	O
</s>
<s>
The	O
host	O
command	B-Application
is	O
also	O
able	O
to	O
perform	O
reverse	B-Protocol
IP	I-Protocol
lookups	I-Protocol
to	O
find	O
the	O
FQDN	B-Protocol
associated	O
with	O
an	O
IP	B-Protocol
address	I-Protocol
.	O
</s>
