There's no provision for blocking an IP address in the HOSTS file.
You'd need to know the host name.
Typically "ping -a 81.222.131.59" entered at a command pormpt would resolve
the name. In this case it doesn't; that address isn't pingable.
Whois isn't much help either; so as far as the HOSTS file goes, I don't know
what to tell you.
If you are behind a configurable router, maybe you could block the IP
address there.
=========================================
inetnum: 81.222.0.0 - 81.222.255.255
org: ORG-EA40-RIPE
netname: RU-ELTEL-20021128
descr: ELTEL.NET
descr: PROVIDER
country: RU
admin-c: ER4040-RIPE
tech-c: ER4040-RIPE
status: ALLOCATED PA
mnt-by: RIPE-NCC-HM-MNT
mnt-lower: ELTEL-RIPE-MNT
mnt-routes: ELTEL-RIPE-MNT
source: RIPE # Filtered
organisation: ORG-EA40-RIPE
org-name: ELTEL
org-type: LIR
address: 10N, 65-67, Chaykovskogo Str.
address: 191123
address: Saint-Petersburg
address: Russian Federation
phone: +7 812 4381100
fax-no: +7 812 4381101
e-mail: (e-mail address removed)
admin-c: DS544-RIPE
admin-c: OS1157-RIPE
admin-c: AG12797-RIPE
admin-c: SA507-RIPE
mnt-ref: ELTEL-RIPE-MNT
mnt-ref: RIPE-NCC-HM-MNT
mnt-by: RIPE-NCC-HM-MNT
source: RIPE # Filtered
role: ELTEL REGISTRY
address: JSC ELTEL
address: 10N, 65-67,
address: Chaykovskogo st.
address: 191123 Saint-Petersburg
address: Russia
phone: +7 812 4381100
phone: +7 812 4381102
fax-no: +7 812 4381101
e-mail: (e-mail address removed)
remarks: trouble: Points of contact for ELTEL
remarks: trouble: Sales:
(e-mail address removed)
remarks: trouble: Routing and peering issues:
(e-mail address removed)
remarks: trouble: SPAM and Network security issues:
(e-mail address removed)
remarks: trouble: Mail issues:
(e-mail address removed)
remarks: trouble: LIR issues:
(e-mail address removed)
remarks: trouble: Information:
http://www.eltel.net
remarks: trouble: Hosting:
http://www.HostWay.ru
admin-c: SA507-RIPE
admin-c: OS1157-RIPE
tech-c: AG12797-RIPE
tech-c: YV89-RIPE
nic-hdl: ER4040-RIPE
mnt-by: ELTEL-RIPE-MNT
source: RIPE # Filtered
% Information related to '81.222.128.0/20AS20597'
route: 81.222.128.0/20
descr: ELTEL.net
origin: AS20597
mnt-by: ELTEL-RIPE-MNT
source: RIPE # Filtered
==================================================