Class A IP address with Class C subnet mask?

Salah -

New member
I was reading about IP address and subnet masks.
I noticed that sometimes you might have class A IP address, but the subnet mask is a class C
For example
IP address is
10.5.9.8 (Class A)
The subnet mask is:
255.255.255.0 (Class C subnet mask)


Why and How does that happen?

Thank you
 
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