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Re: HOWTO: Understand Binary and Subnetting
by air1 on Tuesday May 28, @02:27PM
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Congratulations for this excellent explanation, I hardly ever come accross something this concise.
I hope to see more of that soon, more on TCP/IP.
By the way is there a straightforward way to determine one's mask address from his IP address?
Just want to look up some of the guys port scanning my box.
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Re: HOWTO: Understand Binary and Subnetting
by Scott on Friday June 14, @05:16PM
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Nice way to explain it.
It's very rare that people break things down properly. Usually in between there are examples the complex the matters and don't really provide real examples. YOUR'S DID!
I'm still waiting for books to be published in this manner. I liked the color coded correlation between items of reference. nice.
Thanks.
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Re: HOWTO: Understand Binary and Subnetting
by Lou M on Monday June 17, @01:46PM
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This is an excellent explanation of a subject that confounds many new and novice Sys Admins. What I am wondering about though is:
The host addresses will fall between the network numbers, so we will have 30 hosts per network. You're probably wondering why it's not 31? The answer is that the last address of each subnet is used as the broadcast address for that subnet.
So if I understand this correctly by creating a subnet mask of 255.255.255.224 I haven't limited myself to 32 IP adresses (which is what I always thought.)
So what have I done? I have created several 30 IP networks?
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Re: HOWTO: Understand Binary and Subnetting
by MIke Fulwell on Friday September 13, @05:23AM
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Brilliant. Clearly explained something that I was never quite sure about. Thanks.
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Re: HOWTO: Understand Binary and Subnetting
by Mantis 2k on Wednesday October 16, @09:59PM
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So for the /27 subnet, why couldn't you add a 7th network of:
192.168.1.224
Recently I received this very network and subnet for use on my network by my ISP.
Thanks!
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Re: HOWTO: Understand Binary and Subnetting
by Louis on Monday October 21, @09:24AM
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Jason,
Thank you so much for this post!!!
I am in a MCSA/MCSE class where the teacher blistered over this topic. I left with my head spinning.
Your explanations are clear, concise and most important, effective.
I would take a class from you any day and twice on Sundays.
Thanks Again,
Louis
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Re: HOWTO: Understand Binary and Subnetting
by Louis on Monday October 21, @09:32AM
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Jason,
Thank you so much for this post!!!
I am in a MCSA/MCSE class where the teacher blistered over this topic. I left with my head spinning.
Your explanations are clear, concise and most important, effective.
I would take a class from you any day and twice on Sundays.
Thanks Again,
Louis
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Re: HOWTO: Understand Binary and Subnetting
by Don on Tuesday October 22, @04:12AM
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I think there is a flaw in your explanation.
I don't think you should deduct 2 from the number of possible subnets. It should be deducted from the number of hosts (network ID and broadcast address)
Take for example a subnet of 255.255.192.0 with network 10.101.192.0. You have 2 bits in the third octet for the network ID. Using your rule there should be (2x2-2=2) network ID's (64 and 128). So there should be the following networks: 10.101.64.0 through 10.101.127.254 and 10.101.128.0 through 10.101.191.254
What about 10.101.0.0 through 10.101.63.254 and 10.101.192.0 through 10.101.255.254?
What do you think?
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Re: HOWTO: Understand Binary and Subnetting
by Dearld Sanders on Friday December 06, @07:57AM
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I am taking a Cisco Routing class and we are doing subnetting I understand how to obtain the number of subnets and host per subnet but customizing a subnet mask is confusing. Help!!
I need some clarity.
Thanks in advance,
Dearld
Here is an example of a problem:
Required Number of Subnet Segments: 16
Maximum Number of Hosts/Physical Segment: 1,500
Network Address: 128.199.0.0
Figure out the following:
Proposed Custom Subnet Mask:
Number of Subnets Supported:
Maximum Number of Host ID per Subnet:
Another example for a Class A
Required Number of Physical Segment: 10
Maximum Number of Hosts/Physical Segment: 750,0000
Network Address: 12.0.0.0
Figure out the following:
Proposed Custom Subnet Mask:
Number of Subnets Supported:
Maximum Number of Host ID per Subnet:
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Re: HOWTO: Understand Binary and Subnetting
by Olof Krantz on Wednesday January 15, @10:14AM
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Thank you, I have now learned how to use binary, didn't understand that before.
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Re: HOWTO: Understand Binary and Subnetting
by Satish Halemani on Sunday January 26, @06:16AM
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Simply the best site where all my IP Addressing & Subnetting problems since last 1 year were solved within 1 hour of reading the contents.Thanks a Lot.Will certainly recommend it to all my friends.
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Re: HOWTO: Understand Binary and Subnetting
by Penile Torment on Wednesday January 29, @10:16AM
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Thank you so much. I was losing my BLEEPing mind looking for sombody to write an UNDERSTANDABLE explanation of how to work this out. All anybody ever wants to talk about is how they know more than you and bling bling. Well BLEEP THAT, I don't care I just want to comprehend and get on with my life. Thanks for not bieng an asshole.
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Re: HOWTO: Understand Binary and Subnetting
by tony kurian on Friday May 23, @10:25PM
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I spinned my head to understand subneting. No esy way out. All websites did not kneel down this much to make a confused mind undertsnd. Thanx the one who explained it.
Now i feel i should teach 10 more ppl this.
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Re: HOWTO: Understand Binary and Subnetting
by Miguel on Friday May 30, @02:07AM
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After searching for a long time finally someone explain it in English! Thanks Jason. Well done!
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Re: HOWTO: Understand Binary and Subnetting
by Miguel on Friday May 30, @02:07AM
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After searching for a long time finally someone explain it in English! Thanks Jason. Well done!
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Re: HOWTO: Understand Binary and Subnetting
by DJ_SA on Wednesday July 09, @03:56PM
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Hi everyone out there,
Thanx first for the author for writing such an understandable guide...
However, I am still not clear about the -2 part in 2^n-2.
I can understand -2 basically means to eliminate the first portion of the subnet (e.g. AAA.BBB.CCC.0~) and last portion (e.g. ~AAA.BBB.CCC.254)...
but why elinate those two parts of the class? is it not usable?
Thanx!
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Re: HOWTO: Understand Binary and Subnetting
by venkat on Saturday July 19, @02:04AM
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Well i understood your Binary Calculation and what you wanted to explain but this gives rise to few more questions to my mind.
Your example with subnet 255.255.255.240
Your math is understood that i will have 14 sub networks starting from
192.168.1.16
192.168.1.32
192.168.1.48
192.168.1.64
192.168.1.80
192.168.1.96
192.168.1.112
192.168.1.128
192.168.1.144
192.168.1.160
192.168.1.176
192.168.1.192
192.168.1.208
192.168.1.224
this means if i use Address Range: 205.112.10.17 through 205.112.10.30 the subnet will be 255.255.255.240 ?
again for Address Range 205.112.10.33 through 205.112.10.46 the subnet will be 255.255.255.240 is it so?
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Re: HOWTO: Understand Binary and Subnetting
by arun verma on Sunday August 24, @10:09AM
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Jason,
Your notes were excellent, they really made me understand the basics of subnetting. Thank you so much for the great notes.
I am planning on doing my CCNA , could you please give me any notes you may have , I would greatly appreciate it.
Thanks
arun
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Re: HOWTO: Understand Binary and Subnetting
by micah on Wednesday September 10, @10:57PM
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Dude I was so confused with binary and that cleared everything up it is by Far THE BEST explanation of Binary I have ever heard you are Awesome. Thanks a Bunch.
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Re: HOWTO: Understand Binary and Subnetting
by Sarwat on Wednesday September 10, @11:22PM
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Thanks Jason!! Thank you for explaining it in such a simple, easy-to-understand style. Hope to have more such posts from you.
Sarwat
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Re: HOWTO: Understand Binary and Subnetting
by Loretta on Sunday September 14, @01:34PM
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I just want to thank you for putting this out. I was having problem subnetting. This was so much easier on my brain. I kept getting stuck at one point. Keep up the training to other people. Thank you for your brain :)
Loretta
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Re: HOWTO: Understand Binary and Subnetting
by Doris L. on Wednesday October 08, @10:22AM
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This is great! I can honestly say, I really understand. Now I can move forward on my home assignment.
Thank you!
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Re: HOWTO: Understand Binary and Subnetting
by Jesse on Monday October 27, @07:32PM
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Hi there,
Iam just wondering why in a class C network the first and last subnets are not used. Making only six subnets, even though there are 8.
In your article you say that you cant count all 1s or all 0s. So are you really saying that these whole subnets are usless because you cant supply a network address for the first subnet and you cant supply a broadcast address for the last subnet?
Am i on the right track. ? It seems like a huge waste of address space. Is there a way that you can use this 2 subnets? I have heard that this may be possible through super subnetting.
Am i on the track ?
Great article by the way, helped heaps. Thanks
Jesse
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Re: HOWTO: Understand Binary and Subnetting
by Renegatu on Friday December 12, @06:03AM
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I have to congratulate you for this article ...
it helped me very much ...
Thank you, again...
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Re: HOWTO: Understand Binary and Subnetting
by Jase on Wednesday December 17, @07:21PM
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OMG!!! YOU ARE A GENIUS!!!, If I knew where you lived I would buy you a hooker and a keg (if thats what ya wanted) For the first time in years I finally got subnetting! THANK YOU!
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Re: HOWTO: Understand Binary and Subnetting
by Allen on Tuesday January 13, @11:28AM
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This is the best I have ever seen explaining subneting. Finally I get it. Thanks :-)
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Re: HOWTO: Understand Binary and Subnetting
by shashi on Sunday January 18, @08:41PM
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hello mate
ur document is very nice i was so confused about subnetting but now i got it atleast C class.
can u do a favour for me, can u send all classes subnetting document like this way u made this document. plz get back me soon.
thanx.
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Re: HOWTO: Understand Binary and Subnetting
by John on Sunday January 25, @02:33AM
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google search: understand binary
wowzorz, you've enlightend a newbie. Everyone needs to send you a dollar. Thanks for the info I lub teh www.
john
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Re: HOWTO: Understand Binary and Subnetting
by Sehbaz on Wednesday February 04, @07:53AM
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Can anyone help answer these questions and how they got em. Thanks.
1) XYZ Company has a Class B address, 190.85 and uses the 3rd byte for the Subnet ID. (All 0s subnet not allowed)
a. What is the maximum # of subnets on this network? ________
b. What is the maximum # of hosts on each subnet? __________
c. For the first subnet on the network:
i. What is the network ID? ____________________________
ii. What is the broadcast ID? ____________________________
iii. What is the range of host IDs? ____________________________________________
2) Instead of using one byte, Smith company decides to use ten bits for the Subnet ID. (All 0s subnet not allowed)
a. What is the maximum # of subnets on this network? ________
b. What is the maximum # of hosts on each subnet? __________
c. For the first subnet on the network:
i. What is the network ID? ____________________________
ii. What is the broadcast ID? ____________________________
iii. What is the range of host IDs? ____________________________________________
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Re: HOWTO: Understand Binary and Subnetting
by Ranjith Udayshankar on Friday February 06, @11:32AM
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Hi..
My name is Ranjith.Your information about subnetting was really excellent.My best wishes to you guys...........
Ranjith
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Re: HOWTO: Understand Binary and Subnetting
by luc on Wednesday April 07, @11:27AM
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Excellent tutorial! You could make a great teacher.
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Re: HOWTO: Understand Binary and Subnetting
by Gijs on Thursday June 10, @03:09AM
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hey man, this you explain this better than my ciscoteacher :)
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Re: HOWTO: Understand Binary and Subnetting
by Raul Santana on Friday June 25, @07:44PM
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Your tutorial is absolutely excellent.
I have been trying to understand this concept through other readings. Some writers like to complicate concepts to prove themselves to nobody.
You did a wonderful job. I understood the concept in a very simple and straightforward way.
You are a teacher.
Thanks...
Raul
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Re: HOWTO: Understand Binary and Subnetting
by Numpty on Monday June 28, @03:34AM
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Dude...you saved my career...I'm studying my MCSE and damn near packed it in because I couldn't get my head around Binary...
Paid $10K Australian to learn this stuff and didn't get it...and I go to the web and u've explained it for free...pure genious....
IT should have more layman explanations...or at least a link that says "Please put this geek speak into english for me..."
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Re: HOWTO: Understand Binary and Subnetting
by Graham on Saturday July 24, @11:29PM
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Great post.
Very helpfull at last i now understand binary & subnetting a lot more.
Thanks for your time.
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Re: HOWTO: Understand Binary and Subnetting
by John on Sunday April 03, @09:32PM
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lots of thanks to you.
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Re: HOWTO: Understand Binary and Subnetting
by pmrussell892 on Tuesday October 25, @09:33PM
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WOW! That was great, I have tried reading up on that from other tutorials and just end up with. HUUH!!
After reading your tut here i can now read binary numbering AND understand subnetting
Thanx Bunches
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Posted by Jason on Sunday May 26, @12:44PM
HOWTO: Understand Binary and Subnetting
