CLASS A 1 TO 126
CLASS B 128 TO 192
CLASS C 193 TO 223
127.0.0.1 LOOP BACK IP ADDRESS
ABOVE 224 MULTICASTING
The short answer is that they aren't. Class A,B,C networks are outdated; most everyone uses classless networks these days. Check out CIDR or "Variable Length Subnet Masking". Classful IP...
Class B includes anything that starts with binary "10", or in decimal, 128-191 for the first byte.
In Internet Protocol version 4 (IPv4), an address beginning with a binary 1110. Class D addresses are reserved for multicast applications.
The IP 185.75.255.10 is in Class B.