Excel Trouble Using Excel "sumproduct"

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Hi all,

This is quite complicated but I'll try to make it as simple as I can.

I have a spreadsheet og IP address info and I would like to count on multiple conditions, I've already managed this in other parts of my spreadsheet but when I try to use the below I don't get any results, I've been through having the "N/A" and "Value" problems but now I get a "0" value:
=SUMPRODUCT(Subnets!$G$2:$G$756=A35)*(Subnets!$E$2:$E$756="")*(LEFT(Subnets!$F$2:$F$756,8)="10.236.8")

I'll try and explain what I'm trying to do, My IP list contains a List of Subnets with Names, Subnet address and Subnet mask. What I want to do is count

1.how many times a particular size subnet is used (i.e.255.255.255.240, this list starts at "A35"
2.If that Subnet has no Name
2.and the subnet address starts with "10.236.8"

After entering the above formulea I go into the range that is been queried and delete some sunbet names but the results don't appear in my spreadsheet.

Anyone got any ideas?
 
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