subnet calculator

can anyone tell me where i can get an online calculator that will calculate
the sbnets available for an IP address?

i have found ones claiming to be subnet calculators but all they do is let
me see the host range etc. i want one that willlist al of the available
subnets

Thanks




Christo

"Christo" <chris@ no spamming juststuff.co.uk> wrote in message
news:d4ajis$jra$(E-Mail Removed)...
> can anyone tell me where i can get an online calculator that will
> calculate the sbnets available for an IP address?

Can you elaborate? It's not clear exactly what you mean by "subnets
available for an IP address".

> i have found ones claiming to be subnet calculators but all they do is
> let me see the host range etc.

That is all a subnet calculator does. I guess you want something else.

Alex

"Alex Fraser" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> "Christo" <chris@ no spamming juststuff.co.uk> wrote in message
> news:d4ajis$jra$(E-Mail Removed)...
>> can anyone tell me where i can get an online calculator that will
>> calculate the sbnets available for an IP address?
>
> Can you elaborate? It's not clear exactly what you mean by "subnets
> available for an IP address".
>
>> i have found ones claiming to be subnet calculators but all they do is
>> let me see the host range etc.
>
> That is all a subnet calculator does. I guess you want something else.
>
> Alex
>
>

yeah, i think my maths might be wrong somewhere too

for instance IP 200.10.10.0/24

would only have one network

Subnet Network Min IP Max IP
Broadcast
0 200.10.10.0 200.10.10.1 200.10.10.254 200.10.10.255

where as subnet 200.10.10.0/28 would have 16? you get me?

Subnet Network Min IP Max IP
Broadcast
0 200.10.10.0 200.10.10.1 200.10.10.14
200.10.10.15
1 200.10.10.16 200.10.10.17 200.10.10.30
200.10.10.31
2 200.10.10.32 200.10.10.33 200.10.10.46
200.10.10.47
3 200.10.10.48 200.10.10.49 200.10.10.62
200.10.10.63
4 200.10.10.64 200.10.10.65 200.10.10.78
200.10.10.79
5 200.10.10.80 200.10.10.81 200.10.10.94
200.10.10.95
6 200.10.10.96 200.10.10.97 200.10.10.110
200.10.10.111
7 200.10.10.112 200.10.10.113 200.10.10.126
200.10.10.127
8 200.10.10.128 200.10.10.129 200.10.10.142
200.10.10.143
9 200.10.10.144 200.10.10.145 200.10.10.158
200.10.10.159
10 200.10.10.160 200.10.10.161 200.10.10.174
200.10.10.175
11 200.10.10.176 200.10.10.177 200.10.10.190
200.10.10.191
12 200.10.10.192 200.10.10.193 200.10.10.206
200.10.10.207
13 200.10.10.208 200.10.10.209 200.10.10.222
200.10.10.223
14 200.10.10.224 200.10.10.225 200.10.10.239
200.10.10.239
15 200.10.10.240 200.10.10.241 200.10.10.254
200.10.10.255

i was told with a 24 mask it should have 16 too by my ccna instructor? i
used a calculator to get these results but with a /24 should it be the first
example i gave or should there be 16 subnet networks?

"Christo" <chris@ no spamming juststuff.co.uk> wrote in message
news:d4aoq5$nl9$(E-Mail Removed)...
>
> "Alex Fraser" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> "Christo" <chris@ no spamming juststuff.co.uk> wrote in message
>> news:d4ajis$jra$(E-Mail Removed)...
>>> can anyone tell me where i can get an online calculator that will
>>> calculate the sbnets available for an IP address?
>>
>> Can you elaborate? It's not clear exactly what you mean by "subnets
>> available for an IP address".
>>
>>> i have found ones claiming to be subnet calculators but all they do is
>>> let me see the host range etc.
>>
>> That is all a subnet calculator does. I guess you want something else.
>>
>> Alex
>>
>>
>
> yeah, i think my maths might be wrong somewhere too
>
> for instance IP 200.10.10.0/24
>
> would only have one network
>
> Subnet Network Min IP Max IP Broadcast
> 0 200.10.10.0 200.10.10.1 200.10.10.254
> 200.10.10.255
>
> where as subnet 200.10.10.0/28 would have 16? you get me?
>
> Subnet Network Min IP Max IP Broadcast
> 0 200.10.10.0 200.10.10.1 200.10.10.14
> 200.10.10.15
> 1 200.10.10.16 200.10.10.17 200.10.10.30 200.10.10.31
> 2 200.10.10.32 200.10.10.33 200.10.10.46 200.10.10.47
> 3 200.10.10.48 200.10.10.49 200.10.10.62 200.10.10.63
> 4 200.10.10.64 200.10.10.65 200.10.10.78 200.10.10.79
> 5 200.10.10.80 200.10.10.81 200.10.10.94 200.10.10.95
> 6 200.10.10.96 200.10.10.97 200.10.10.110
> 200.10.10.111
> 7 200.10.10.112 200.10.10.113 200.10.10.126 200.10.10.127
> 8 200.10.10.128 200.10.10.129 200.10.10.142 200.10.10.143
> 9 200.10.10.144 200.10.10.145 200.10.10.158 200.10.10.159
> 10 200.10.10.160 200.10.10.161 200.10.10.174 200.10.10.175
> 11 200.10.10.176 200.10.10.177 200.10.10.190 200.10.10.191
> 12 200.10.10.192 200.10.10.193 200.10.10.206 200.10.10.207
> 13 200.10.10.208 200.10.10.209 200.10.10.222 200.10.10.223
> 14 200.10.10.224 200.10.10.225 200.10.10.239 200.10.10.239
> 15 200.10.10.240 200.10.10.241 200.10.10.254 200.10.10.255
>
> i was told with a 24 mask it should have 16 too by my ccna instructor? i
> used a calculator to get these results but with a /24 should it be the
> first example i gave or should there be 16 subnet networks?
>

sorry that post got messed up to view the results go to

http://ccna.exampointers.com/sub.php

try 200.10.10.0 with a 24 mask and a 28 mask

i am just confused about the /24 and /28 what they mean exactly

Christo wrote:
8><..............................
>
> i am just confused about the /24 and /28 what they mean exactly
>
>

http://public.pacbell.net/dedicated/cidr.html
http://www.warriorsofthe.net/utils/

"Christo" <chris@ no spamming juststuff.co.uk> wrote in message
news:d4aoup$o5c$(E-Mail Removed)...
[snip]
> i am just confused about the /24 and /28 what they mean exactly

The "/nn" (CIDR) notation and subnet masks are two different ways of
expressing the same thing. Write a subnet mask in binary, eg 255.255.255.0:

11111111.11111111.11111111.00000000

There are 24 leading ones, so a subnet mask of 255.255.255.0 is equivalent
to /24.

Written in binary, subnet masks always consist of a number of leading ones,
with the remaining digits being zero (and a total of 32 digits). Doing the
reverse of the above, /28 means 28 leading ones and is equivalent to:

11111111.11111111.11111111.11110000

This is 255.255.255.240 in decimal.

Alex

"Alex Fraser" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> "Christo" <chris@ no spamming juststuff.co.uk> wrote in message
> news:d4aoup$o5c$(E-Mail Removed)...
> [snip]
>> i am just confused about the /24 and /28 what they mean exactly
>
> The "/nn" (CIDR) notation and subnet masks are two different ways of
> expressing the same thing. Write a subnet mask in binary, eg
> 255.255.255.0:
>
> 11111111.11111111.11111111.00000000
>
> There are 24 leading ones, so a subnet mask of 255.255.255.0 is equivalent
> to /24.
>
> Written in binary, subnet masks always consist of a number of leading
> ones,
> with the remaining digits being zero (and a total of 32 digits). Doing the
> reverse of the above, /28 means 28 leading ones and is equivalent to:
>
> 11111111.11111111.11111111.11110000
>
> This is 255.255.255.240 in decimal.
>
> Alex
>
>

thank you

In article <d4aoup$o5c$(E-Mail Removed)>, Christo
says...

> try 200.10.10.0 with a 24 mask and a 28 mask
>
> i am just confused about the /24 and /28 what they mean exactly
>
Learn how to do binary maths then it all becomes crystal clear.


--
Conor

"Of all the things I've lost, I miss my mind the most." O.Osbourne.

In message <(E-Mail Removed)> , Conor
<(E-Mail Removed)> writes
>In article <d4aoup$o5c$(E-Mail Removed)>, Christo
>says...
>
>> try 200.10.10.0 with a 24 mask and a 28 mask
>>
>> i am just confused about the /24 and /28 what they mean exactly
>>
>Learn how to do binary maths then it all becomes crystal clear.
>
>
And also check out www.learntosubnet.com. Subnets are NOT the mystical
black magic some people make them out to be, they are really very simple
once you understand binary and the logical AND function.
--
Clint Sharp