Should you ever forget intricacies of the subnetting Checkpoint have subnetting calculator right in their firewalls - ipcalc.
Given subnet show the 1st Ip (network) :
ipcalc -n 192.168.34.45/27
Given subnet show the last IP (broadcast) :
ipcalc -b 192.168.34.45/27
Be careful though what you feed as no proof-reading is done by the ipcalc :
ipcalc -b 192.168.34.45/33