Question

what are the ip address used by CIDR address 192.168.10.0/20 give the range

Answer 1

192.168.10.0/20 means subnet 255.255.240.0

so the range should be 

192.168.0.0 to 198.168.15.255 

Comments

i think range should be 192.168.0.1 to 198.168.15.254

because 192.168.0.0 used as network id  and 198.168.15.255  used as dba

correct me if iam wrong

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@arch

They are asking range of IP addresses but what you are saying is the range of IP addresses for which hosts can be configured :)

Clearly 192.168.0.0 used as net Id and 198.168.255.255 as dba, both of them cannot be assigned to any host but they are valid IP addresses of given CIDR block

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ok i got it thank u for clearing my doubt

Answer 2

the /20 states that there are 20 network bits in this so just leave them and for range just put all 0's in host bits and then all 1 in that .
192.168.00001010.00000000.. so range will be from 192.168.0.0 to 192.168.15.255.  note that you are given an ip in this range it does not means that range will start after it only .

Comments

^^ if it is classless then ?? 192.168.10.0 reminds me something :-P

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I can't remember I guess it is private IP address the answer may be wrong I have not read networks since last year is it the correct answer??