Is an IP Address Within a Specified Range?

Determining IP Range Inclusion in GoLang

In the realm of network management, it is crucial to ascertain whether an IP address falls within a specified range. In Go/GoLang, accessing this information is made efficient through the use of bytes comparison.

IP Address Representation

IP addresses are designated as bigendian slices of bytes, allowing for straightforward comparison operations.

Function Breakdown

The provided solution employs a function named check, which determines if a given IP address is within a defined range. Here's how it operates:

1. It parses the input IP address into its internal byte representation using net.ParseIP.
2. It validates the parsed IP as an IPv4 address by verifying that it is not nil when converted to an IPv4 address using To4.
3. It utilizes bytes.Compare to ascertain whether the input IP address is between the specified range boundaries.
4. If the IP address is within the range, it prints a confirmation message; otherwise, it informs that it's outside the range.

Usage

The primary function can be invoked with different IP addresses as parameters to verify their range membership.

Example Output

The sample code illustrates the functionality of the solution:

• IP address 1.2.3.4 is not within the range.
• IP address 216.14.49.185 is within the range.
• Input that is not an IPv4 address, such as 1::16, is recognized as invalid.

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