#from the docs
  n  An unsigned short (16-bit) in "network" (big-endian) order.
  N  An unsigned long (32-bit) in "network" (big-endian) order.
  v  An unsigned short (16-bit) in "VAX" (little-endian) order.
  V  An unsigned long (32-bit) in "VAX" (little-endian) order.