I’ve always had a problem generating a proper subnet mask to
specify a range of IP addresses. When I learned how to subnet,
about 20 years ago, I can recall that I understood the concept,
which included a lot of binary bitwise comparisons, but that it
really wasn’t very much fun. That’s probably why I stopped using
them.
I have to wonder… do the people who use subnet masks on a
regular basis really sit around doing binary math to come up with
the proper numbers? It certainly isn’t an interesting job.
Aren’t there tables available for this purpose, or possibly even a
subnet mask calculator application? Surely, after all this time,
someone must have come up with a way to finally end the
torment involved.
Earlier this evening, subsequent to performing an online search,
I visited the following web page, which gave me at least a glimmer
of hope:
Good grief… a table! A table which actually makes sense and is
perhaps even easy to comprehend.
I figure where there’s one table, there are probably others,
perhaps even more intuitive or more complete than the one
on that web page.
If you happen to have one to share… by all means, please post
the link here for those of us who find subnetting to be drudgery.
In advance… thanks.
Regards.
Edit: I neglected to include the fact that I’d like to start using
address/subnet in Comodo Firewall, as opposed to just specifying
a simple range of IP addresses.
It’s a great document that covers not just classic subnetting, but VLSM and CIDR.
As far as tables go, there are loads, but the easiest way, I find now, is using a subnet calculator, There are those you can download and run locally, but it’s just as easy to visit on online resource. Again, there are plenty, but I, more often than not, use these:
Thanks. I’ve added this to my ever-growing collection of white papers and
tutorials.
As far as tables go, there are loads, but the easiest way, I find now, is using a subnet calculator, There are those you can download and run locally, but it's just as easy to visit on online resource. Again, there are plenty, but I, more often than not, use these:
Wow! These really do work. They actually give me a little more information
than I needed, so I’m bound to learn something new.
Edit: Just a thought. If you're looking for IPv6 tools as well as IPv4, [url=http://www.subnetonline.com/pages/subnet-calculators/ipv4-to-ipv6-converter.php]SubnetOnline.com[/url] is pretty good.
Bookmarked for future reference. I haven’t played with IPv6 yet;
I’m not quite ready for the big time, but I’ll get there eventually.
After downloading and testing a couple of different IP calculators,
I’d have to say that I like the Bitcricket IP Calculator the best.
It allows you to either view and/or calculate:
IPv4
IPv6
CIDR
This Host
This Network
Class A
Class B
Class C
Class D/Multicast
Class E/Experimental
Loopback
Broadcast
I doubt that it’s supported anymore, and its web site is either
down or no longer exists. I can’t speak to the IPv6 aspect of
the app, but for IPv4 it seems to work fine. It looks like it was
released in 2007.
The other ones I downloaded were Advanced IP Calculator, and
Solarwinds Subnet Calculator. The latter would not install because
I don’t have .NET Framework on my machine.
For an IPV6 CIDR Calculator I’ve been using this one…
I actually learned how to do the IPV4 Calculations on my own with the help of a calculator, but IPV6 the numbers became to large for my calculator to handle.