12-14-2006 12:07 AM - edited 03-05-2019 01:20 PM
Hi, can you just confirm the below is right ?
For 10.0.0.0/19 ip address assignment, can you confirm my
calculation below for the last subnet is correct ?
Interesting because if I use an IP calculator, when I
get to subnet "10.255.224.0" I hit "next subnet" and then
I get 11.0.0.0. I know that may be a silly observation,
but I just want to make sure I am not overlooking anything.
First subnet Broadcast host range
10.0.0.0 (zero) 10.0.31.255 10.0.0.1 - 10.0.31.254
Last subnet Broadcast host range
10.255.224.0 10.255.255.255 10.255.224.1 - 10.255.255.254
Number of bits in the subnet identifier:11
Number of possible IP addresses in each subnet:2^11 = 2048
12-14-2006 01:16 AM
you are having 10.0.0.0/19 subnet and I guess you are further trying to subnet this network. For this you need to tell us that what is the new subnet mask you are using to further subnet this network. hope my understanding is correct else correct me.
say, you are going to further subnet this /19 to /24 network. In this case you will have 32 /24 network each having 254 hosts. remember you can further subnet these /24s into /25 ... /30 depending on your requirement.
hope to helps ... rate if it does ...
12-14-2006 02:39 AM
Hi Marlon
For network 10.0.0.0/19
Subnet Address is 10.0.0.0
Broadcast Address is 10.0.31.255
Host Range is 10.0.0.1 - 10.0.31.254
If you are trying to "subnet" this network with 2048 address per subnet, then you will have:
No. Subnet Address Hosts From Hosts To Broadcast Address
0 10.0.0.0 10.0.0.1 10.0.7.254 10.0.7.255
1 10.0.8.0 10.0.8.1 10.0.15.254 10.0.15.255
2 10.0.16.0 10.0.16.1 10.0.23.254 10.0.23.255
3 10.0.24.0 10.0.24.1 10.0.31.254 10.0.31.255
Hope this helps
12-14-2006 10:29 AM
I also got confused by the question.
The book just tells this:
Given the "IP address assignment 10.0.0.0/19, what is the first and last subnet? What is the range of hosts for the first and last subnet? ".
Since thet 10.0.0.0 is a class A address, I figured that Subnet Mask bit = 11.
Subnet Mask = 255.255.224.0.
From there I found the data I posted.
If you think my interpretation from the question is wrong, please let me know.
12-14-2006 08:18 PM
I don't know where you got the Subnet Mask bit=11 from... a /19 network has the subnet mask of 255.255.224.0
Your network is 10.0.0.0/19, which means each subnet has 2^13 usable addresses (32-19), minus wire/broadcast addresses. This equates to 8190 usable per /19 network.
First subnet (assuming ip subnet-zero), will be the 10.0.0.0/19, consisting of 10.0.0.0 through 10.0.31.255.
Last subnet will be 10.0.224.0 through 10.0.255.255.
The point to remember is for a /19 network, the first 19 bits cannot change. This makes the first two octets (10.0) easy to calculate, and the third octet just goes up in 32's.
12-21-2006 02:34 AM
hi,
caluclations for subnet mask of 10.0.0.0 /19
is
8 bits + 8bits + 3bits =19 bits
11111111 + 11111111 + 11100000 + 00000000
255 . 255. 128+64+32 . 0
255.255.224.0
subnet mask for 10.0.0.0 /19 = 255.255.224.0
to caluclate the different subnets use this simple method
256 -224 = 32
subnet 1 = 0 31 :host range usable(1-30)
subnet 2 = 32 63
subnet 3 = 64 95
subnet 4 = 96 127
subnet 5 =128 159
subnet 6 =160 191
subnet 7 =192 223
subnet 8 =224 255
:host range usable(225-254)
Hope this helps you,
Thanks
Raj
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