Updates active_information_gathering.md

# Active information gathering

Once the Passive 

Once the passive phase is over it is time to move to the active phase. In this phase we start interacting with the target.

## Netdiscover

This tool is used to scan a network for live machines.

```

netdiscover -r 192.168.1.1/24

```

## References

https://blog.bugcrowd.com/discovering-subdomains

https://high54security.blogspot.cl/2016/01/recon-ng-and-power-to-crawl-trough.html