whatmask 192.168.64/27

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TCP/IP NETWORK INFORMATION
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IP Entered = ..................: 192.168.55.64
CIDR = ........................: /27
Netmask = .....................: 255.255.255.224
Netmask (hex) = ...............: 0xffffffe0
Wildcard Bits = ...............: 0.0.0.31
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Network Address = .............: 192.168.55.64
Broadcast Address = ...........: 192.168.55.95
Usable IP Addresses = .........: 30
First Usable IP Address = .....: 192.168.55.65
Last Usable IP Address = ......: 192.168.55.94