.tk[0] (e.g. a component of a Tcl/Tk[1] (or perhaps Perl/Tk, or Python/Tkinter) belongs to Tokelau[2].

[0] https://en.wikipedia.org/wiki/.tk

[1] https://en.wikipedia.org/wiki/Tk_(software)

[2] https://en.wikipedia.org/wiki/Tokelau