Tools I used this tool for windows its called IPScan http://www.eusing.com/ipscan/free_ip_scanner.htm
Through router find the list of connected devices.
Attached devices/DHCP Clients Table
.In windows i used arp -a and then look for the mac address of my Raspberry pi. since I had gitbash the below command worked for my windows
arp -a |grep -i "01-.00-.5e-.7f-.ff-.fa"
[EDIT]: Corrected grep in arp -a |grep -i "01.00.5e.7f.ff.fa"
to use regex for mac devides