Subnet Mask

Subnet mask is used by the computer and router to determine the network and host portion of the IP address.

[loficrabwoman]

Bruh I had like 1 day left to create an entire presentation on IP addresses, and I was so confused. Legit nothing helped me, I couldn't understand anything anybody else was telling me. You are my savior, kind sir. I am forever in your debt.

[lanecurameng]

Yes, Mr. French, I've researched almost 50 of these videos to get the best explanation, and
yours is the best! Thank you!

[manfredohl]

Thank you Mr.French, your explanation brings it back to the basics without disturbing calculations pictures and numbers but with mentioning the technical reason for it. This gives me the chance not to forget it. Thank you!

[davisalexander]

This is the simplest break down on how the network portion of the IP correlates with the host portion of the IP, thanks!

[tamijackson]

This is the best tutorial I could find on the topic. Thank you. You take a complex concept and make it simple as possible.

[kevinh]

I just started learning Networking stuff, thank you for this video. Very clear to understand and easy on the ears.

[jakehenri]

Thank you Greg, this was a wonderfully explained video. I don't mind your small refreshers on things like binary and ANDing because you explained them very carefully, and nothing was missed if one skipped forward a bit. Great video, and you really talked about what matters instead of what doesn't.

[tjjackson]

@ 8:50, my life got turned upside down. All these years I had no idea. Best explanation ever. 25 years old and dealing with computers all my life and finally, it makes sense.

[BrandonLee-wzgt]

This was the best explanation I have seen and really stuck, thanks.

[adrianmcleod]

Very good explanation. I now fully understand subnet masks. The only downside is that u made an error for the Class B subnet mask. The example that was used is a Class C default subnet mask. Class B = 255.255.0.0 while Class C = 255.255.255.0. Still a good video however and I now have a better understanding. Thank you!

[Douglas_Gillette]

A router does not typically use a subnet mask to dermine a host portion and network portion. The only time it might use one is when it is sourcing a packet. The router utilizes the subnet mask to determine whether the destination address of the packet is on the local subnet. The router still uses subnet masks stored in its routing table to process packets but not to determine a host and network portion.

[sonofJurell]

If you already understand binary then this is by far the best explanation. You, Mr.French, are getting a new subscriber.

[anthony]

i have been asking this question for 30 years. now i understand . TQ teacher

[NatureandSpirit]

So the subnet masking is a bitwise function essentially in order to separate what nodes can see as a security measure but also for segmenting the network jobs. A router needs to assume as few responsibilities as possible to speed up the network. A small router with minimal processing power and less ram needs to deal with smaller instruction sets.

[Axeman]

Thanks for the explanation, the subnet masks make so much more sense now.

[LeonardSeymore]

Very detailed and useful. Thanks for a high quality explanation!

[kylewu]

Your voice reminds me of Jeff Goldblum. Thanks for this video.

[prajwalghadge]

I'm really thankful cause i searched all the net for a simple explanation found none

[MrFunnyful]

I finally understand subnet masks. Greg you're a god my guy.

[hetfield]

Best explanation I could find - amazing, thank you! 👍🏻