This question already has an answer here:
At www.keylength.com, I found the following table of ECC field size and the corresponding RSA modulus recommended by NIST.
ECC Modulus RSA Prime Size
But NIST proposed P-192, P-224, P-256, P-384, P-521 curves. May I know what is equivalent RSA modulus for P-192 and P-521 curves?