You have four networks of 99.34.64.0, 99.34.68.0, 99.34.78.0 and 99.34.95.0 you need to supernet in order to use once ACL in a firewall.

99.34.64.0 – 99.34.95.0 fall into the range of 99.34.64.0 – 99.34.95.255 which consists of a 32 decimal division.
The first octets are 255.255, to calculate the 3rd octet we need to covert 32 decimal to a binary bit mask:
Screenshot_2018-10-28_08-49-32
2^5 = 32. As we are working on the subnet we work from the left. The resulting mask is 11100000.
The third octet now has 3 bits making the CIDR 8 + 8 + 3 = 19.
The subnets will be as follows:

99.34.0.0 - 99.34.31.255
99.34.32.0 - 99.34.63.255
99.34.64.0 - 99.34.95.255

The final address will be 99.34.64.0/19.

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