this post was submitted on 20 Aug 2023
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How do you organize your DHCP clients? (lemmy.world)
submitted 1 year ago by DrakeRichards@lemmy.world to c/selfhosted@lemmy.world
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I’m setting up DHCP reservations on my home network and came up with a simple schema to identify devices: .100 is for desktops, .200 for mobiles, .010 for my devices, .020 for my wife’s, and so on. Does anyone else use schemas like this? I’ve also got .local DNS names for each device, but having a consistent schema feels nice to be able to quickly identify devices by their IPs.

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[–] nutbutter@discuss.tchncs.de 6 points 1 year ago (3 children)

Can you tell what do the values after / denote? Like /8, /24.

I have seen them in many places. I even use /8 in my Wireguard config. But I do not know what it is. I do not even know its name to look it up online.

[–] Chetyre@lemmy.world 6 points 1 year ago

The term you are looking for is CIDR notation. The / is showing what the subnet mask is. So the subnet mask for a /8 is 255.0.0.0, which would be an extremely large network (over 16 million addresses, this was traditionally known as a Class A).

https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#CIDR_notation

[–] chepdamona@sh.itjust.works 2 points 1 year ago

It's called CIDR notation, the number represents how many bits of the whole address represent the "network" part of the address. /8 is equivalent to a subnet mask of 255.0.0.0