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Sep 30th, 2016
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  1. 255.255.248.0 in binary: 11111111 11111111 11111000 00000000
  2. -----------------------------------
  3. I counted twenty-one 1s -------> /21
  4.  
  5. 128.42.5.4 in binary: 10000000 00101010 00000101 00000100
  6. 255.255.248.0 in binary: 11111111 11111111 11111000 00000000
  7. ----------------------------------- [Logical AND]
  8. 10000000 00101010 00000000 00000000 ------> 128.42.0.0
  9.  
  10. 128.42.5.4 in binary: 10000000 00101010 00000101 00000100
  11.  
  12. 255.255.248.0 in binary: 11111111 11111111 11111000 00000000
  13.  
  14. Host bit mask : 00000000 00000000 00000hhh hhhhhhhh
  15.  
  16. 128.42.5.4 in binary: 10000000 00101010 00000101 00000100
  17. Host bit mask : 00000000 00000000 00000hhh hhhhhhhh
  18. ----------------------------------- [Force host bits]
  19. 10000000 00101010 00000111 11111111 ----> 128.42.7.255
  20.  
  21. 128.42.5.4 in binary: 10000000 00101010 00000101 00000100
  22. Host bit mask : 00000000 00000000 00000111 11111111
  23. ----------------------------------- [Logical AND]
  24. 00000000 00000000 00000101 00000100 -----> 0.0.5.4
  25.  
  26. 128.42.5.17 in binary: 10000000 00101010 00000101 00010001
  27. 128.42.5.67 in binary: 10000000 00101010 00000101 01000011
  28. ^ ^ ^
  29. | | |
  30. +--------- Network ---------+Host-+
  31. (All bits are the same) Bits
  32.  
  33. 128 64 32 16 8 4 2 1
  34. SN SN SN SN SN SN H H
  35. 1 0 0 1 1 1 1 1
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