You can access the IS 456:2000 (with amendments up to 2017) from the Bureau of Indian Standards (BIS) website or purchase a hard copy from a bookstore. Here's a direct link to the BIS website:

Would you like more information on IS 456 or help with a specific aspect of the code?

Keep in mind that it's essential to verify the authenticity and accuracy of any PDF version you access, as outdated or unauthorized versions may lead to errors or misinterpretations.