<s>
A	O
Gnutella	B-Application
crawler	I-Application
is	O
a	O
software	O
program	O
used	O
to	O
gather	O
statistic	O
information	O
on	O
the	O
gnutella	B-Protocol
file	O
sharing	O
network	O
,	O
such	O
as	O
the	O
number	O
of	O
users	O
,	O
the	O
market	O
share	O
of	O
different	O
clients	O
and	O
the	O
geographical	O
distribution	O
of	O
the	O
userbase	O
.	O
</s>
<s>
Although	O
this	O
method	O
is	O
still	O
usable	O
,	O
it	O
is	O
too	O
slow	O
to	O
capture	O
enough	O
data	O
for	O
a	O
topological	O
overview	O
of	O
the	O
gnutella	B-Protocol
network	O
as	O
it	O
requires	O
initiating	O
full	O
gnutella	B-Protocol
connections	O
;	O
this	O
involves	O
several	O
roundtrips	O
to	O
perform	O
the	O
header	O
processing	O
.	O
</s>
<s>
An	O
extension	O
has	O
been	O
added	O
to	O
the	O
gnutella	B-Protocol
protocol	O
to	O
allow	O
crawlers	O
to	O
quickly	O
access	O
ultrapeers	B-Protocol
.	O
</s>
<s>
Right	O
now	O
,	O
there	O
is	O
no	O
publicly	O
accessible	O
crawler	O
online	O
on	O
the	O
gnutella	B-Protocol
network	O
,	O
since	O
the	O
last	O
one	O
hosted	O
by	O
Lime	B-Application
Wire	I-Application
LLC	I-Application
has	O
been	O
taken	O
down	O
.	O
</s>
<s>
It	O
is	O
written	O
and	O
maintained	O
by	O
dcat	O
and	O
licensed	O
under	O
the	O
GPL	B-License
.	O
</s>
