Hi,

I have IP address 10.180.10.18 and subnet 255.192.0.0.
What?
size of the network part of the address
size of subnet part of the address
size of host part
number of host per subnet
subnet number
range of valid ip address in this network

Thanks,
JT
###### Who is Participating?

Commented:
255.192.0.0 is in binary form 11111111.11000000.00000000.00000000 and
10.180.10.18 is in binary form 00001010.10110100.00001010.00010010

> Network address is 10 bit - 10.128.0.0/10
There are (first) 10 bits set in binary form of subnet/netmask. If you make an bitwise AND operation between your host number and the subnet mask you get 10.128.0.0 which is your network.

> Subnet part is 2 bit
First 8 bits (of the 10) denote an A class address, next two bits can be considered subnet part.

> Host part is the remaining 22 bits (32 - 10)
And the 22 zeroes in the subnet (if writing out all 8 bits of each number)

> There are 4194302 hosts per subnet
If you have 22 bits for host part, then you have 2^22 = 4194304 possible IPs
First IP is reserved for the network address and the last IP for broadcast address. So there are 4194302 IP addresses left for hosts.

> Not sure about subnet number, but probably it is the third subnet from four (previous beeing 10.0.0.0/10, 10.64.0.0/10 and next 10.192.0.0/10)
Given that the two bits in second octet denote the subnet, you can construct 4 subnets: 10.0.0.0/10, 10.64.0.0/10, 10.128.0.0/10, 10.192.0.0/10

> Range of IP addresses is 10.128.0.1 - 10.191.255.254
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Commented:
http://www.subnet-calculator.com/subnet.php?net_class=A

Network address is 10 bit - 10.128.0.0/10
Subnet part is 2 bit
Host part is the remaining 22 bits (32 - 10)
There are 4194302 hosts per subnet
Not sure about subnet number, but probably it is the third subnet from four (previous beeing 10.0.0.0/10, 10.64.0.0/10 and next 10.192.0.0/10)
Range of IP addresses is 10.128.0.1 - 10.191.255.254

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Commented:
size of the network part of the address 16581375
size of subnet part of the address 4161600
size of host part 4161600
number of host per subnet 4161600
subnet number 10.128.0.0
range of valid ip address in this network 10.128.0.0-10.191.255.255
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Author Commented:
Hi,

Thanks for giving the website to calculate, but could you
show me how you come up with this answer?

Many thanks,
JT
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Author Commented:
Thanks
JT
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