X-class flares and their association with super-active regions (SARs) were analyzed for 23-24 solar cycles. Results show that, total number of X-class flares occur simultaneously relate as (≥ X10) to 4.80 %, X5.0-X9.9 to 9.60%, X3.0-X4 to 12.80%, X2.0-X2.9 to 15.20%, X1.0-X1.9 to 57.60% for SC 23. Similarly, total number of X-class flares occur simultaneously relate as (≥ X10) to 0.00%, X5.0-X9.9 to 8.16%, X3.0-X4.9 to 8.16%, X2.0-X2.9 to 22.40% and X1.0-X1.9 to 61.20%. Distribution of X-class flares for the SC 23 and 24 shows scattered manner. It is also observed that, SC 24 was weak than SC 23 and the total number of X-class flares diminished in comparison to earlier solar cycles. SARs generated 29.16% of the X1.0-X1.9 flares, 36.84% of the X2.0-X2.9 flares, 43.75% of the X3.0-X4.9 flares, 83.33% of both the X5.0-X9.9 flares, and 100.00% of the ≥ X10 flares for SC 23 and 20.00% of the X1.0-X1.9 flares, 36.36% of the X2.0-X2.9 flares, 25.00% of the X3.0-X4.9 flares, 75.00% of the X5.0-X9.9 flares, and 0.00% of the ≥ X10 flares for SC 24.