One Reverse Lookup Zone for Serveral Subnets?

[atze]

Hi Guys,

Maybe someone here can help with this, I have created 2 Bind9 Slave 
Zones, the Master is a Windows 2k Server.

In this we have the subnets 10.0.0.0/20 and 10.49.0.0/20, and 2 DNS Domains.

This are 3 Zones on Windows , 2 For the DNS Domains and 1 Reverse Lookup
for all Zones.

The 2 DNS Domain Slave Zones working good, but however the Reverse 
Lookup isn't working.

I also tried to make a Slave Zone from the Reverse Lookup Zone on 
Windows, this seems first to be working, but now no more.

How can I create one Reverse Lookup for the whole 10.x.x.x  Subnet?
Bind says that i must put in 3 Digit Numbers.

Or can I make from the Windows Reverse Lookup Zone as a Slave Zone on Bind?

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Can someone give me suggestions?

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Also I know that Bind has an option to fullfill automatically the FQDN,
when I type "dig hostname" it search all existing Zone and filles up the 
FQDN, where can I set this?

Thanks in advance, cheers