<s>
A	O
private	B-Protocol
sub-domain	I-Protocol
registry	I-Protocol
allocates	O
domain	O
names	O
in	O
a	O
subset	O
of	O
the	O
Domain	B-Protocol
Name	I-Protocol
System	I-Protocol
under	O
a	O
domain	O
registered	O
with	O
an	O
ICANN-accredited	O
or	O
ccTLD	B-Application
registry	O
.	O
</s>
<s>
Most	O
of	O
the	O
private	B-Protocol
sub-domain	I-Protocol
registries	I-Protocol
operate	O
based	O
on	O
an	O
ISO	B-General_Concept
3166-1	I-General_Concept
name	O
that	O
is	O
a	O
subdomain	O
of	O
a	O
higher-level	O
domain	O
.	O
</s>
<s>
Some	O
of	O
these	O
registries	O
combine	O
the	O
domain	B-Protocol
registry	I-Protocol
and	O
the	O
domain	B-Application
registrar	I-Application
functions	O
in	O
the	O
administration	O
structure	O
,	O
while	O
others	O
distribute	O
domains	O
via	O
third-party	O
registrars	O
.	O
</s>
<s>
Private	O
registries	O
operate	O
at	O
a	O
technical	O
level	O
identical	O
to	O
official	O
domain	B-Protocol
registries	I-Protocol
using	O
the	O
well-known	O
principles	O
of	O
operation	O
of	O
the	O
Domain	B-Protocol
Name	I-Protocol
System	I-Protocol
.	O
</s>
<s>
In	O
addition	O
,	O
the	O
registries	O
may	O
also	O
operate	O
a	O
WHOIS	B-Protocol
service	O
to	O
publish	O
domain	O
name	O
information	O
.	O
</s>
<s>
The	O
idea	O
for	O
an	O
independent	O
global	O
domain	B-Protocol
name	I-Protocol
registry	I-Protocol
stems	O
from	O
a	O
series	O
of	O
conversations	O
between	O
one	O
of	O
CentralNic	O
's	O
original	O
founders	O
and	O
the	O
late	O
Jon	O
Postel	O
,	O
one	O
of	O
the	O
founding	O
fathers	O
of	O
the	O
modern	O
Internet	O
.	O
</s>
<s>
After	O
the	O
use	O
of	O
UK.COM	O
,	O
other	O
ISO	B-General_Concept
Country	I-General_Concept
codes	I-General_Concept
ending	O
in	O
.COM	O
were	O
also	O
established	O
such	O
as	O
AU.COM	O
(	O
Australia	O
)	O
and	O
HK.COM	O
(	O
Hong	O
Kong	O
)	O
and	O
many	O
other	O
countries	O
.	O
</s>
