can we use an IP range of addresses in LEM rules, instead of adding a rule for every address, or typing all possible addresses in one rule?

Hello,

we recently added a Linux server and we are creating filters for it. We are looking for a way to filter IPs that don't belong to any of our 3 blocks of IPs, our 3 blocks together have around 300 IPs.  If there is a way to add them all in the filter or rule without having to type all down, or having to create many rules for each one of them that would be great.

Any suggestion will be appreciated.

Thanks.

Vicky