Summary
ppp-9.vo.lu has one IP number , which also has a corresponding reverse pointer.
gen.tk,
8tk.tk,
hzn1.tk,
toji.tk,
spas.tk and at least 100 other hosts point to the same IP.
vo.lu is a domain controlled by two nameservers at
vo.lu themselves. They are on the same IP network. Incoming mail for
vo.lu is handled by one mailserver also at
vo.lu.
vo.lu has one IP number.
ppp-9.vo.lu is hosted on a server in Netherlands even though the hostname implies Luxembourg.