Netmask Translation Table
This is a Netmask Translation Table. It can be used to determine
what IPs should be used and which ones cannot be used.
Netmask CIDR Notes
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255.255.255.255 /32 Host (single address)
255.255.255.254 /31 Unusable
255.255.255.252 /30 4 IPs with 2 Usable
255.255.255.248 /29 8 IPs with 6 Usable
255.255.255.240 /28 16 IPs with 14 Usable
255.255.255.224 /27 32 IPs with 30 Usable
255.255.255.192 /26 64 IPs with 62 Usable
255.255.255.128 /25 128 IPs with 126 Usable
255.255.255.0 /24 256 IPs with 254 Usable "Class C"
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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Each customer will be given their own unique IP block necessary
to configure their own network. This unique IP information will be
supplied by their Account Manager.
The below is only an EXAMPLE, do NOT use its IPs,
instead, use those IP numbers that come from your Account Manager.
Your Account Manager should give you all the following information.
Dear Customer:
Your IP block is 205.177.54.32/28
Gateway IP address (Router IP) 205.177.54.33
Useable IP's 205.177.54.34-46
Subnet Mask 255.255.255.240
DNS Servers: ns.cais.com 205.177.10.10
ns2.cais.com 199.0.216.222
Subnetmask Translation Table
This is a Netmask Translation Table. It can be used to determine
what IPs should be used and which ones cannot be used.
Subnetmask Subnetmask (binary) CIDR Notes
=================================================================================================
255.255.255.255 11111111.11111111.11111111.11111111 /32 Host (single address)
255.255.255.254 11111111.11111111.11111111.11111110 /31 Unusable
255.255.255.252 11111111.11111111.11111111.11111100 /30 4 IPs with 2 Usable
255.255.255.248 11111111.11111111.11111111.11111000 /29 8 IPs with 6 Usable
255.255.255.240 11111111.11111111.11111111.11110000 /28 16 IPs with 14 Usable
255.255.255.224 11111111.11111111.11111111.11100000 /27 32 IPs with 30 Usable
255.255.255.192 11111111.11111111.11111111.11000000 /26 64 IPs with 62 Usable
255.255.255.128 11111111.11111111.11111111.10000000 /25 128 IPs with 126 Usable
255.255.255.0 11111111.11111111.11111111.00000000 /24 256 IPs with 254 Usable
"Class C"
255.255.254.0 11111111.11111111.11111110.00000000 /23
255.255.252.0 11111111.11111111.11111100.00000000 /22
255.255.248.0 11111111.11111111.11111000.00000000 /21
255.255.240.0 11111111.11111111.11110000.00000000 /20
255.255.224.0 11111111.11111111.11100000.00000000 /19
255.255.192.0 11111111.11111111.11000000.00000000 /18
255.255.128.0 11111111.11111111.10000000.00000000 /17
255.255.0.0 11111111.11111111.00000000.00000000 /16
"Class B"
255.254.0.0 11111111.11111110.00000000.00000000 /15
255.252.0.0 11111111.11111100.00000000.00000000 /14
255.248.0.0 11111111.11111000.00000000.00000000 /13
255.240.0.0 11111111.11110000.00000000.00000000 /12
255.224.0.0 11111111.11100000.00000000.00000000 /11
255.192.0.0 11111111.11000000.00000000.00000000 /10
255.128.0.0 11111111.10000000.00000000.00000000 /9
255.0.0.0 11111111.00000000.00000000.00000000 /8
"Class A"
254.0.0.0 11111110.00000000.00000000.00000000 /7
252.0.0.0 11111100.00000000.00000000.00000000 /6
248.0.0.0 11111000.00000000.00000000.00000000 /5
240.0.0.0 11110000.00000000.00000000.00000000 /4
224.0.0.0 11100000.00000000.00000000.00000000 /3
192.0.0.0 11000000.00000000.00000000.00000000 /2
128.0.0.0 10000000.00000000.00000000.00000000 /1
0.0.0.0 00000000.00000000.00000000.00000000 /0
IP space
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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