Why Can’t an IP Address Octet Be Higher Than 255?
Learn how to quickly identify an invalid IP address. Discover the basic rules of IPv4 formatting, why octets are limited to a maximum value of 255, and how to spot networking errors.
Question
Which is NOT a valid IP address?
A. 172.16.14.356
B. 192.168.250.12
C. 8.8.8.8
D. 10.0.0.5
Answer
A. 172.16.14.356
Explanation
To understand why this is the right answer, you just need to look at the basic rules of an IPv4 address. These addresses are made up of four sections, known as octets, separated by periods. Because each octet represents an 8-bit binary number, the lowest possible value is 0 and the absolute highest is 255. When you look at option A, the final number is 356, which breaks that core rule and instantly makes the IP address invalid.
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