What is the rule to solve this subnetting problem?

NAME: IP Address Subnet Mask Network ID Broadcast ID CIDR Range # Host # Nets 192.168.51.71255.255.255.0 192.168.51.0 /24 0-25.5 254 16777214 0-31,32-63, 64-95,96-127, 128-159, 160-191, 192-223, 192.168.26.37255.255.255.224 192.168.26.32 /27224-255 30 134217726 0-7, 8-15, 16-23, 24-31, 32- 39, 40-47, 48-55, 56-63....120 192.168.26.125 255.255.255.248 192.168.26.120 29 127 536870910 0-63, 64-127, 128-191,192- 192.168.26.12 255.255.192.0 192.168.0.0 192.168.63.255 /18 255 192.168.26.53 181.54.54.3 /20 137.18.54.6 /21 156.84.61.87 /22 192.168.26.57 /23 192.168.72.46 25 192.168.104.127 /26 192.168.26.51 /28 0-3, 4-7,8-11, 12-15, 16-19,20-23,24-27,28- 31,32-35,36-39,40-43,44-47,48-51,52-55,56- 59,60-63,64-67,68-71,72-75,76-79,80-83,84- 192.168.26.95 /30 87,88-91,92-95,96-99,100-103,104-107,108- 63, 64-71,72-79, 80-87, 88-95, 96-103, 104-111, 112-119, 120-127, 128-135, 136-143, 144-151 152-159, 160-167, 168-175, 176-183, 184-191, 137.18.54.6 5 192-199, 200-207, 208-215, 216-223, 224-231