<s>
Tailscale	B-Application
Inc	O
.	O
is	O
a	O
software	O
company	O
based	O
in	O
Toronto	O
,	O
Canada	O
.	O
</s>
<s>
Tailscale	B-Application
develops	O
an	O
open-source	B-License
software-defined	O
mesh	B-Architecture
virtual	B-Application
private	I-Application
network	I-Application
(	O
VPN	B-Application
)	O
and	O
a	O
web-based	O
management	O
service	O
.	O
</s>
<s>
The	O
company	O
provides	O
a	O
zero	B-Application
config	I-Application
VPN	B-Application
as	O
a	O
service	O
under	O
the	O
same	O
name	O
.	O
</s>
<s>
Founded	O
in	O
2019	O
by	O
Google	B-Application
engineers	O
Avery	O
Pennarun	O
,	O
David	O
Crawshaw	O
,	O
David	O
Carney	O
,	O
and	O
Brad	O
Fitzpatrick	O
,	O
the	O
company	O
secured	O
funding	O
of	O
$12	O
million	O
in	O
a	O
Series	O
A	O
round	O
in	O
November	O
2020	O
led	O
by	O
Accel	O
with	O
seed	O
investors	O
,	O
Heavybit	O
and	O
Uncork	O
Capital	O
participating	O
.	O
</s>
<s>
The	O
company	O
's	O
name	O
is	O
inspired	O
from	O
a	O
research	O
paper	O
The	O
Tail	O
at	O
Scale	O
published	O
by	O
Google	B-Application
.	I-Application
</s>
<s>
The	O
open-source	B-License
software	O
acts	O
in	O
combination	O
with	O
the	O
management	O
service	O
to	O
establish	O
peer-to-peer	O
or	O
relayed	O
VPN	B-Application
communication	O
with	O
other	O
clients	O
using	O
the	O
WireGuard	B-Application
protocol	O
.	O
</s>
<s>
The	O
IPv4	O
addresses	O
given	O
to	O
clients	O
are	O
in	O
the	O
carrier-grade	B-Protocol
NAT	I-Protocol
reserved	O
space	O
.	O
</s>
