Flips (/24's flip more frequently; /21-24's most transients)

Pf.len   prefxs      flp.pf      flips       trans  %all %flp.pfs %flips   %trans
      1               1              0              0              1       0.00       0.00        0.00        0.00
      2               1              0              0              1       0.00       0.00        0.00        0.00
      8             28              8          264            11       0.02       0.03        0.45        0.05
      9               5              0              0               0      0.00       0.00        0.00        0.00
     10              9              0              0               1      0.01       0.00        0.00        0.00
     11             12             1              2               0      0.01       0.00        0.00        0.00
     12             39             8            12               1      0.03       0.03        0.02        0.00
     13             95           13            21               0     0.07       0.04        0.04        0.00
     14           236           27            43               5     0.17       0.09        0.07        0.02
     15           410           55            81               5     0.30       0.18        0.14        0.02
     16         7387       1256       1966           115     5.38       4.05        3.32        0.52
     17         1452         203         302             62     1.06       0.65        0.51        0.28
     18         2605         401         581           115     1.90       1.29        0.98        0.52
     19         7450       1213       1792          203      5.42       3.91        3.02        0.92
     20         6852       1737       3981          356      4.99       5.60        6.72        1.61
     21         7176       1193       1866        2009      5.22       3.85        3.15        9.08
     22         8803       1792       3367        1169      6.41       5.78        5.68        5.28
     23       11636       2600       4503        2028      8.47       8.39        7.60        9.16
     24       83177     20500     40480     16049    60.55     66.11      68.31      72.52
Total    137374     31007     59261     22131   100.00   100.00   100.00   100.00
The fraction of flips in /24 range is larger than fair share
But not overwhelmingly large