QR Code encoder
Generates a 2-dimensional PNG barcode:

like that
The QR code term stands for Quick Response Code.
QR codes are square barcodes storing information in a machine-readable optical label.
The QR Code is a two-dimensional version of the barcode, known from product packaging in the supermarket.
How to find someone's IP?
If you don't know the IP address of a person and you want to locate it: