Daryl's TCP/IP Primer

Addressing and Subnetting on the Near Side of the 'Net

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7. Daryl's Subnet Calculator

[Old, non-DHTML version]
Enter IP Address:
Enter Subnet Mask:
Enter Destination Address:
Step 1: Convert all values to Binary:
a. IP Address: Enter a valid IP address
b. Subnet Mask: Enter a valid network prefix
c. Destination Address: Enter a valid IP address
Step 2: Apply Source subnet mask to Source address:
a. Address (from 1a): Enter a valid source IP address
Mask (from 1b): Enter a valid Network Prefix
= Src Network: Enter a valid source IP address and mask
= Src Network:
Step 3: Apply Source subnet mask to Destination address:
Address (from 1c): Enter a valid destination IP address
Mask (from 1b): Enter a valid Network Prefix
= Dst Network(?): Enter a valid source mask and dest IP address
This might be the destination network.
Step 4: Compare the network portions for equality:
Source Net: Enter a valid source IP address and mask
Destination Net(?): Enter a valid source mask and dest IP address
Are they the same?
Result:
The result will display here if you have JavaScript enabled.
Ever get one of those spam e-mails where the IP address is an integer? Type it in here and it will be decoded:
Excercises:
I've also noticed a freeware Win32 app that does similar things at http://www.net3group.com/ipcalc.html-ssi.


Next: Routing and Static Routes
Copyright ©1996-2008 Daryl Banttari. See Disclaimer.