Subnet Mask?

5 pts.
Tags:
Subnet mask calculation
Subnets
Subnetting
Can you please tell me how to find mask when only subnets are known?e.g find out mask when subnets are 50?
ASKED: June 10, 2009  6:35 AM
UPDATED: July 1, 2009  10:48 AM

Answer Wiki

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Try this <a href=”http://lmgtfy.com/?q=subnet+cheat+sheet”>Google search result</a> listing. Or, look at this <a href=”http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800a67f5.shtml”>Cisco Technote on ip addressing</a>.

<pre>Class C
Mask Notation Subnets Hosts
255.255.255.0 /24 1 256
255.255.255.128 /25 2 128
255.255.255.192 /26 4 64
255.255.255.224 /27 8 32
255.255.255.240 /28 16 16
255.255.255.248 /29 32 8
255.255.255.252 /30 64 4
255.255.255.254 /31 128 2
255.255.255.255 /32 256 1

Class B
Mask Notation Subnets Hosts
255.255.0.0 /16 2 65,536
255.255.128.0 /17 2 32,768
255.255.192.0 /18 4 16,384
255.255.224.0 /19 8 8,192
255.255.240.0 /20 16 4,096
255.255.248.0 /21 32 2,048
255.255.252.0 /22 64 1,024
255.255.254.0 /23 128 512
255.255.255.0 /24 256 256

Class A
Mask Notation Subnets Hosts
255.0.0.0 /8 1 16,777,216
255.128.0.0 /9 2 8,388,608
255.192.0.0 /10 4 4,194,304
255.224.0.0 /11 8 2,097,152
255.240.0.0 /12 16 1,048,576
255.248.0.0 /13 32 524,288
255.252.0.0 /14 64 262,144
255.254.0.0 /15 128 131,072
255.255.0.0 /16 256 65,536

</pre>

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  • Djeepp
    Subnets are 50? 50 subnets? 50 IPs per subnet? You'll have to be more specific.
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