IP 101 - Netmask Translation Table

[bflores]

IP 101
The following tables show how many hosts per subnet

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Bit -------- Mask -------------- Qty ---- Usable
/24 ___ 255.255.255.0 ____ 255 ____ 254
/25 ___ 255.255.255.128 __ 128 ____ 126
/26 ___ 255.255.255.192 ___ 64 _____ 62
/27 ___ 255.255.255.224 ___ 32 _____ 30
/28 ___ 255.255.255.240 ___ 16 _____ 14
/29 ___ 255.255.255.248 ____ 8 ______ 6
/30 ___ 255.255.255.252 ____ 4 ______ 1

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Note: The first and last IP of a series are NOT usable
and the first usable IP is normally set up for the router.
The 1st IP is the network address.
The last IP is the broadcast address.
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