this post was submitted on 04 Nov 2026
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    IPv4 is hard (jlai.lu)
    submitted 1 day ago by hylobates@jlai.lu to c/linuxmemes@lemmy.world
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    [–] sem@lemmy.blahaj.zone 2 points 17 hours ago (1 children)

    Thankyou! So when I see things like 192.168.1.0/24, is that CIDR notation? And does that do a similar thing of the subnet mask by telling you which addresses are part of the subnetwork?

    Can you have CIDR and subnet mask at the same time?

    [–] Aceticon@lemmy.dbzer0.com 2 points 16 hours ago* (last edited 16 hours ago) (1 children)

    Well, a network mask is by definition always a sequence of 1s followed by 0s (in other words, you can't arbitrarilly have some bits be 0 in between bits which are 1), so that /24 in CIDR notation is literally "/" + the number of bits in the network mask which have the value 1.

    In other words, because of that "sequence of 1s followed by 0s" rule both 255.255.255.0 and /24 are just two different descriptions of the same network mask, first as 4 decimal numbers separated by dots, whilst the second as the count of bits in the binary representation of the mask which have the value 1.

    For example, the 255.255.252.0 network mask from my first example in my last post could also be represented by /22 since the mask has 8+8+6 = 22 bits with value 1 and the rest are 0 - 192.168.0.0/22 means the same as 192.168.0.0/255.255.252.0

    There is no point in having both that part of the CIDR representation and the decimal mask representation at the same time because they're both different representations of the same thing so having both is redundant.

    [–] sem@lemmy.blahaj.zone 2 points 16 hours ago (1 children)

    Thanks, that rule about which masks are allowed was definitely not clear to me at first, thank you

    [–] Blaster_M@lemmy.world 2 points 12 hours ago* (last edited 12 hours ago)

    Depends on the equipment. I prefer cidr because its simpler, and ipv6 uses CIDR. Do you want to spell out a /64 in a netmask format? It would look like this: 255.255.255.255.255.255.255.255.0.0.0.0.0.0.0.0