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Are there any jar to check whether two ip address is in same network segment

ken jun
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Joined: Apr 23, 2010
Posts: 46
"IP_A" and its prefix length of subnet mask is known , and there is a "IP_B" , I want to check whether "IP_A" is in the same netwoek segment with "IP_B", is there any jar JAVA has provided?

If there isn't any jar could finish the job.I have to finish by myself.

My way is like this. First make a binary notation according to the prefix length called "subnet" and then use the "subnet" to do AND operation with the "IP_A" ,then get the "network number" , do the same thing using "IP_B" and "subnet" and get another network number(network number2).
Finally compare the "network number" and the "network number2" to see whether they're the same.

If I merely know the prefix length of subnet mask , how can I get the subnet mask in binary or demical notation?
Thanks a lot!
jun
Karthik Shiraly
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Joined: Apr 04, 2009
Posts: 497
    
    5
Try Apache Commons Net library's SubnetUtils and SubnetInfo.isInRange()
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38519
    
  23
Not a "beginning" question. Moving.
ken jun
Ranch Hand

Joined: Apr 23, 2010
Posts: 46
Karthik Shiraly wrote:Try Apache Commons Net library's SubnetUtils and SubnetInfo.isInRange()


Thanks a lot I will try it after class.... going to have class

Could you give me some tips helping me finish this?
" If I merely know the prefix length of subnet mask , how can I get the subnet mask in binary or demical notation? "
ken jun
Ranch Hand

Joined: Apr 23, 2010
Posts: 46
Campbell Ritchie wrote:Not a "beginning" question. Moving.


ah...I am sorry , how careless I was.. anyway thanks
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38519
    
  23
No problem ; many people do that. Apology accepted.
ken jun
Ranch Hand

Joined: Apr 23, 2010
Posts: 46
Campbell Ritchie wrote:No problem ; many people do that. Apology accepted.


you are so nice .
By the way Could you give me some tips helping me finish this?
" If I merely know the prefix length of subnet mask , how can I get the subnet mask in binary or demical notation? "
ken jun
Ranch Hand

Joined: Apr 23, 2010
Posts: 46
ken jun wrote:
Campbell Ritchie wrote:No problem ; many people do that. Apology accepted.


you are so nice .
By the way Could you give me some tips helping me finish this?
" If I merely know the prefix length of subnet mask , how can I get the subnet mask in binary or demical notation? "


how foolish I was ,the jar SubnetUtils has a constainer that using CIDR, it means I can just know the ip and the prefix.
 
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