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Abak
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AbakIT Senior Engineer
Asked: July 27, 20222022-07-27T11:17:45+06:00 2022-07-27T11:17:45+06:00In: Network

How to calculate a subnet mask from IP and subnets?

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Guide me to Subnet Mask (Subnetting) & IP Subnet Calculator.
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  1. admin IT Moderator
    2022-07-27T11:25:54+06:00Added an answer on July 27, 2022 at 11:25 am

    Subnetting
    Assuming you take a gander at the table above, it can seem like the number of IP addresses is for all intents and purposes limitless. All things considered, there are practically 4.2 billion potential IPv4 addresses accessible.

    In any case, on the off chance that you contemplate how much the web has developed, and the number of additional gadgets that are associated nowadays, it probably won’t shock you to hear that there’s now a lack of IPv4 addresses.

    Since the deficiency was perceived quite a while back, engineers concocted a method for separating an IP address into more modest networks called subnets.

    This cycle, called subnetting, utilizes the host part of the IP address to separate it into those more modest networks or subnets.

    Subnet Masks Work
    Subnet masks capability as a kind of channel for an IP address. With a subnet mask, gadgets can take a gander at an IP address, and sort out what parts are the network bits and which are the host bits.

    Then, at that point, utilizing those things can sort out the most ideal way for those gadgets to convey.

    In the event that you’ve looked around the network settings on your switch or computer, you’ve probably seen this number: 255.255.255.0.

    Provided that this is true, you’ve seen an exceptionally normal subnet mask for basic home networks.

    Like IPv4 addresses, subnet masks are 32 bits. Furthermore, very much like converting an IP address into paired, you can do exactly the same thing with a subnet mask.

     

    Class A

    Network Bits Subnet Mask Number of Subnets Number of Hosts
    /8 255.0.0.0 0 16777214
    /9 255.128.0.0 2 (0) 8388606
    /10 255.192.0.0 4 (2) 4194302
    /11 255.224.0.0 8 (6) 2097150
    /12 255.240.0.0 16 (14) 1048574
    /13 255.248.0.0 32 (30) 524286
    /14 255.252.0.0 64 (62) 262142
    /15 255.254.0.0 128 (126) 131070
    /16 255.255.0.0 256 (254) 65534
    /17 255.255.128.0 512 (510) 32766
    /18 255.255.192.0 1024 (1022) 16382
    /19 255.255.224.0 2048 (2046) 8190
    /20 255.255.240.0 4096 (4094) 4094
    /21 255.255.248.0 8192 (8190) 2046
    /22 255.255.252.0 16384 (16382) 1022
    /23 255.255.254.0 32768 (32766) 510
    /24 255.255.255.0 65536 (65534) 254
    /25 255.255.255.128 131072 (131070) 126
    /26 255.255.255.192 262144 (262142) 62
    /27 255.255.255.224 524288 (524286) 30
    /28 255.255.255.240 1048576 (1048574) 14
    /29 255.255.255.248 2097152 (2097150) 6
    /30 255.255.255.252 4194304 (4194302) 2

     

    Class B

    Network Bits Subnet Mask Number of Subnets Number of Hosts
    /16 255.255.0.0 0 65534
    /17 255.255.128.0 2 (0) 32766
    /18 255.255.192.0 4 (2) 16382
    /19 255.255.224.0 8 (6) 8190
    /20 255.255.240.0 16 (14) 4094
    /21 255.255.248.0 32 (30) 2046
    /22 255.255.252.0 64 (62) 1022
    /23 255.255.254.0 128 (126) 510
    /24 255.255.255.0 256 (254) 254
    /25 255.255.255.128 512 (510) 126
    /26 255.255.255.192 1024 (1022) 62
    /27 255.255.255.224 2048 (2046) 30
    /28 255.255.255.240 4096 (4094) 14
    /29 255.255.255.248 8192 (8190) 6
    /30 255.255.255.252 16384 (16382) 2

     

    Class C

    Network Bits Subnet Mask Number of Subnets Number of Hosts
    /24 255.255.255.0 0 254
    /25 255.255.255.128 2 (0) 126
    /26 255.255.255.192 4 (2) 62
    /27 255.255.255.224 8 (6) 30
    /28 255.255.255.240 16 (14) 14
    /29 255.255.255.248 32 (30) 6
    /30 255.255.255.252 64 (62) 2

     

    Class D

    CIDR Block Supernet Mask Number of Class C Addresses Number of Hosts
    /14 255.252.0.0 1024 262144
    /15 255.254.0.0 512 131072
    /16 255.255.0.0 256 65536
    /17 255.255.128.0 128 32768
    /18 255.255.192.0 64 16384
    /19 255.255.224.0 32 8192
    /20 255.255.240.0 16 4096
    /21 255.255.248.0 8 2048
    /22 255.255.252.0 4 1024
    /23 255.255.254.0 2 512

    Class A IP Addresses Network Bits Subnet Mask Number of Subnets Number of Hosts

    Network Bits Subnet Mask Number of Subnets Number of Hosts
    /8 255.0.0.0 0 16777214
    /9 255.128.0.0 2 (0) 8388606
    /10 255.192.0.0 4 (2) 4194302
    /11 255.224.0.0 8 (6) 2097150
    /12 255.240.0.0 16 (14) 1048574
    /13 255.248.0.0 32 (30) 524286
    /14 255.252.0.0 64 (62) 262142
    /15 255.254.0.0 128 (126) 131070
    /16 255.255.0.0 256 (254) 65534
    /17 255.255.128.0 512 (510) 32766
    /18 255.255.192.0 1024 (1022) 16382
    /19 255.255.224.0 2048 (2046) 8190
    /20 255.255.240.0 4096 (4094) 4094
    /21 255.255.248.0 8192 (8190) 2046
    /22 255.255.252.0 16384 (16382) 1022
    /23 255.255.254.0 32768 (32766) 510
    /24 255.255.255.0 65536 (65534) 254
    /25 255.255.255.128 131072 (131070) 126
    /26 255.255.255.192 262144 (262142) 62
    /27 255.255.255.224 524288 (524286) 30
    /28 255.255.255.240 1048576 (1048574) 14
    /29 255.255.255.248 2097152 (2097150) 6
    /30 255.255.255.252 4194304 (4194302) 2

    Class B IP Addresses Network Bits Subnet Mask Number of Subnets Number of Hosts

    Network Bits Subnet Mask Number of Subnets Number of Hosts
    /16 255.255.0.0 0 65534
    /17 255.255.128.0 2 (0) 32766
    /18 255.255.192.0 4 (2) 16382
    /19 255.255.224.0 8 (6) 8190
    /20 255.255.240.0 16 (14) 4094
    /21 255.255.248.0 32 (30) 2046
    /22 255.255.252.0 64 (62) 1022
    /23 255.255.254.0 128 (126) 510
    /24 255.255.255.0 256 (254) 254
    /25 255.255.255.128 512 (510) 126
    /26 255.255.255.192 1024 (1022) 62
    /27 255.255.255.224 2048 (2046) 30
    /28 255.255.255.240 4096 (4094) 14
    /29 255.255.255.248 8192 (8190) 6
    /30 255.255.255.252 16384 (16382) 2

    Supernetting (CIDR) Chart CIDR – Classless Inter-Domain Routing. Note: The Number of Class C networks must be contiguous. For example, 192.169.1.0/22 represents the following block of addresses: 192.169.1.0, 192.169.2.0, 192.169.3.0 and 192.169.4.0. Class C CIDR Block Supernet Mask Number of Class C Addresses Number of Hosts

    CIDR Block Supernet Mask Number of Class C Addresses Number of Hosts
    /14 255.252.0.0 1024 262144
    /15 255.254.0.0 512 131072
    /16 255.255.0.0 256 65536
    /17 255.255.128.0 128 32768
    /18 255.255.192.0 64 16384
    /19 255.255.224.0 32 8192
    /20 255.255.240.0 16 4096
    /21 255.255.248.0 8 2048
    /22 255.255.252.0 4 1024
    /23 255.255.254.0 2 512
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