Resolving the domain by IP address and vice versa

This recipe will introduce you to how you can translate IP addresses into host addresses and vice versa.

How to do it...

1. Open the console and create the folder chapter07/recipe03.
2. Navigate to the directory.
3. Create the lookup.go file with the following content:

        package main

        import (
          "fmt"
          "net"
        )

        func main() {

          // Resolve by IP
          addrs, err := net.LookupAddr("127.0.0.1")
          if err != nil {
            panic(err)
          }

          for _, addr := range addrs {
            fmt.Println(addr)
          }

          //Resolve by address
          ips, err := net.LookupIP("localhost")
          if err != nil {
            panic(err)
          }

          for _, ip := range ips {
            fmt.Println(ip.String())
          }
        }

4. Execute the code by running go run lookup.go in the main Terminal.
5. You will see the following output:

How it works...

The resolution of the...