Given IP  151 . 11 . 84 . 107 / 27  
#1. & 2.  Find the SubNetwork 

#3.  Find the First useable IP address  151 . 11 . 84 . 97 
#4.  Find the Broadcast address  151 . 11 . 84 . 127 
#5  Find the Last useable IP address  151 . 11 . 84 . 126 
#6.  What is the Total Number of IPs per Subnet?  32 
#7.  How many useable Hosts address per subnet?  30 
#8.  What is the Next Subnet Number?  151 . 11 . 84 . 128 
#9.  What IP Class is this?  Class B 
#10.  How many possible Subnetworks with this class?  Bits this Class = 16 Bits Subnet Mask= 27 2^ 11 = 2048 