Final answer:
An IPv4 address is 32 bits long, composed of four octets represented in decimal form.
Step-by-step explanation:
An IPv4 address is 32 bits long. It is divided into four octets (8 bits each), which are usually represented in decimal form and separated by periods. For example, the IP address 192.168.1.1 consists of four octets: 192, 168, 1, and 1, each being a decimal representation of an 8-bit number. Each octet ranges from 0 to 255, allowing for a total of 232 or approximately 4.3 billion unique addresses.