Go/GoLang check IP address in range

Question

In Go/GoLang, what is the fastest way to check if an IP address is in a specific range?

For example, given range 216.14.49.184 to 216.14.49.191

Answer 1

This is already in the stdlib in the "net" package as a function called net.Contains. You dont need to rewrite code that already exists!

See documentation here.

To use it you just have to parse the desired subnets

network := "192.168.5.0/24"
clientips := []string{
    "192.168.5.1",
    "192.168.6.0",
}
_, subnet, _ := net.ParseCIDR(network)
for _, clientip := range clientips {
    ip := net.ParseIP(clientip)
    if subnet.Contains(ip) {
        fmt.Println("IP in subnet", clientip)
    }
}

In case the above code doesn't make sense here is a google play link