<s>
A	O
drop	B-Protocol
registrar	I-Protocol
is	O
a	O
domain	B-Application
name	I-Application
registrar	I-Application
who	O
registers	O
expiring	O
Internet	O
domain	O
names	O
immediately	O
after	O
they	O
expire	O
and	O
are	O
deleted	O
by	O
the	O
domain	B-Protocol
name	I-Protocol
registry	I-Protocol
.	O
</s>
<s>
A	O
drop	B-Protocol
registrar	I-Protocol
will	O
typically	O
use	O
automated	O
software	O
to	O
send	O
up	O
to	O
250	O
simultaneous	O
domain	B-Protocol
name	I-Protocol
registration	I-Protocol
requests	O
in	O
an	O
attempt	O
to	O
register	O
the	O
domain	O
name	O
first	O
.	O
</s>
<s>
In	O
recognition	O
of	O
the	O
potential	O
abuse	O
of	O
such	O
a	O
"	O
domain	O
land	O
rush	O
"	O
,	O
ICANN	B-Application
and	O
VeriSign	B-Application
limited	O
the	O
number	O
of	O
simultaneous	O
requests	O
to	O
250	O
since	O
July	O
17	O
,	O
2001	O
.	O
</s>
<s>
Drop	B-Protocol
registrars	I-Protocol
usually	O
work	O
for	O
a	O
domain	O
back-order	O
service	O
,	O
and	O
receive	O
a	O
percentage	O
of	O
the	O
final	O
auction	O
price	O
.	O
</s>
