IPv4 addresses are 32 bit dotted-decimal numbers (like 192.168.1.1) and can be statically (manually) inputed or dynamically (automatically) assigned by DHCP.
IP Classes include :
- Class A Range: 1-126, Subnet Mask: 255.0.0.0, Private 10.x.x.x
- Class B Range: 128-191, Subnet Mask: 255.255.0.0, Private 172.16.0.0 – 172.31.255.255
- Class C Range: 192-223, Subnet Mask: 255.255.255.0, Private 192.168.x.x
IPv6 addresses are 128-bit hexadecimal numbers (like 2001:7120:0000:8001:0000:0000:0000:1F10). The loopback address is ::1.
Unicast IPv6 addresses are assigned to a single interface and are the most common type.
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**Source by wikipedia **