<s>
The	O
ARPA	B-Protocol
Host	I-Protocol
Name	I-Protocol
Server	I-Protocol
Protocol	I-Protocol
(	O
NAMESERVER	O
)	O
,	O
is	O
an	O
obsolete	O
network	B-Architecture
protocol	O
used	O
in	O
translating	O
a	O
host	B-Device
name	O
to	O
an	O
Internet	O
address	O
.	O
</s>
<s>
IANA	O
Transmission	B-Protocol
Control	I-Protocol
Protocol	I-Protocol
(	O
TCP	O
)	O
and	O
User	B-Protocol
Datagram	I-Protocol
Protocol	I-Protocol
(	O
UDP	O
)	O
port	B-Protocol
42	O
for	O
NAMESERVER	O
;	O
this	O
port	B-Protocol
is	O
more	O
commonly	O
used	O
by	O
the	O
Windows	B-Device
Internet	I-Device
Name	I-Device
Service	I-Device
(	O
WINS	O
)	O
on	O
Microsoft	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
.	O
</s>
<s>
The	O
NAMESERVER	O
protocol	O
is	O
used	O
by	O
the	O
DARPA	O
Trivial	O
Name	O
Server	B-Application
,	O
a	O
server	B-Application
process	B-Operating_System
called	O
tnamed	O
that	O
is	O
provided	O
in	O
some	O
implementations	O
of	O
UNIX	B-Application
.	O
</s>
<s>
Support	O
for	O
the	O
NAMESERVER	O
protocol	O
has	O
been	O
deprecated	B-General_Concept
,	O
and	O
may	O
not	O
be	O
available	O
in	O
the	O
latest	O
implementations	O
of	O
all	O
UNIX	B-Application
operating	I-Application
systems	I-Application
.	O
</s>
<s>
The	O
Domain	B-Protocol
Name	I-Protocol
System	I-Protocol
(	O
DNS	B-Protocol
)	O
has	O
replaced	O
the	O
ARPA	B-Protocol
Host	I-Protocol
Name	I-Protocol
Server	I-Protocol
Protocol	I-Protocol
and	O
the	O
DARPA	O
Trivial	O
Name	O
Server	B-Application
.	O
</s>
