It differs. 442 or 443 are the most common ones. My orchestra tunes 442. When I worked in Germany it was usually 442, but some orchestras tuned 443. Vienna Phi

It differs. 442 or 443 are the most common ones. My orchestra tunes 442. When I worked in Germany it was usually 442, but some orchestras tuned 443. Vienna Phil have historically gone even higher, but are probably down to standard levels by now.