Golang : Find network of an IP address
We will learn how to use Golang's net
package to find out the network behind an IP address. It is fairly trivial to do so with Go and below is the source code.
findnetwork.go
package main
import (
"fmt"
"net"
"os"
)
func main() {
if len(os.Args) != 2 {
fmt.Fprintf(os.Stderr, "Usage: %s hostname\n", os.Args[0])
os.Exit(1)
}
hostname := os.Args[1]
IPAddr, err := net.ResolveIPAddr("ip", hostname)
if err != nil {
fmt.Println("Error in resolving IP")
os.Exit(1)
}
addr := net.ParseIP(IPAddr.String())
if addr == nil {
fmt.Println("Invalid address")
os.Exit(1)
}
mask := addr.DefaultMask()
network := addr.Mask(mask)
fmt.Printf("Address : %s \n Network : %s \n", addr.String(), network.String())
}
Sample output :
localhost:~ admin$ ./findnetwork www.nytimes.com
Address : 170.149.172.130
Network : 170.149.0.0
localhost:~ admin$ ./findnetwork www.techcrunch.com
Address : 192.0.83.250
Network : 192.0.83.0
localhost:~ admin$ ./findnetwork www.google.com
Address : 74.125.130.104
Network : 74.0.0.0
localhost:~ admin$ ./findnetwork www.yahoo.com
Address : 106.10.139.246
Network : 106.0.0.0
Reference :
See also : Get client IP Address in Go
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+16.2k Golang : Linked list example
+10.5k Golang : Get remaining text such as id or filename after last segment in URL path
+26k Golang : Record voice(audio) from microphone to .WAV file
+12.4k Golang : How to get year, month and day?
+22.9k Golang : Call function from another package
+6.3k Golang : Calculate how many weeks left to go in a given year
+4.1k Linux/Unix/MacOSX : Find out which application is listening to port 80 or use which IP version
+16.1k Golang : When to use init() function?
+11k Golang : Send data to /dev/null a.k.a blackhole with ioutil.Discard
+15.4k Golang : read gzipped http response
+9k Golang : Random Rune generator