Home » Kerio User Forums » Kerio Control » Large Scale I.P. Blocking (Best method to MINIMIZE hacking)

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We have many hack attempts against our mail server and internal systems (which are all behind Kerio Control) - these IP addresses are spoofed and done by bits.

Since we ONLY do business in the U.S.A. does anyone see any reason NOT TO BLOCK, large blocks of I.P. addresses that are not assigned to the U.S.?

For instance, I found a site that lists I.P. address blocks and many are assigned exclusively to, for instance, Russia or China, etc. These IP addresses are some that are spoofed in the hack attempts.

My theory here is to add as many blocks as I can thereby REDUCING the number of IP address that might come through the firewall. This would be a REDUCTION, nor ELIMINATION program.

The site I am using for IP address block assignments is;

Petr Dobry (Kerio)

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Well, you won't receive any emails from this forum for instance (as the server is located in Czech Republic).

Petr Dobry
Product Development Manager | Kerio

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I applied - to a firewall last night. It's working great so far.

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Be careful, IP blocks are often resold and transferred multiple times, may have been all china at one time, but it involves many US and Australia ranges now:


- Brian
Kerio Preferred Partner, Reseller & Hosting Provider
Unified Technology Solutions
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