Yes, the networks 220.127.116.11/16 and 18.104.22.168/24 can be used.
As to how many networks are available in a class A network:
It really depends on the masks you are using for subnetting. Today we are using Variable Length Subnet Mask (VLSM), which basically means that the length of the subnet mask does not have to be fixed to the same value everywhere in a network.
Lets take 10.0.0.0/8 as an example.
You can configure 16777216 host routes starting from 10.0.0.0/32, 10.0.0.2/32, ..., 10.255.255.254/32 to 10.255.255.255/32
OR 4194304 routes with /30 OR ... OR 2 routes with /9 namely 10.0.0.0/9 and 10.128.0.0/9
With VLSM you can also have combinations like 10.128.0.0/9 and 10.0.0.0/24 and 10.0.123.32/28 and 10.23.45.67/32 all in the same network.
As you might see now the answer to the question "What is the number of networks in a Class A?" can be between 2 and 16777216 and depends on the subnetmask(s) used.
The main task when subnetting is to avoid duplicate and overlapping IPs. You should not use e.g. 10.1.0.0/16 and 10.1.1.0/24 in two different places or have two hosts with e.g. 10.98.98.98 as then connectivity can be affected or prevented.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...