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Subnet Mask Cheat Sheet

 
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Frank Schroeder
 Frank Schroeder
(@iseetwizard)
Eminent Member Admin
Joined: 5 years ago
Posts: 13
Topic starter 29. July 2025 13:17  

  Addresses Host Netmask Amount of a Class C
/30 4 2 255.255.255.252 1/64
/38 8 6 255.255.255.248 1/32
/28 16 14 255.255.255.240 1/16
/27 32 30 255.255.255.224 1/8
/26 64 62 255.255.255.192 1/4
/25 128 126 255.255.255.128 1/2
/24 256 254 255.255.255.0 1
/23 512 510 255.255.254.0 2
/22 1024 1022 255.255.252.0 4
/21 2048 2046 255.255.248.0 8
/20 4096 4094 255.255.240.0 16
/19 8192 8190 255.255.224.0 32
/18 16384 16382 255.255.192.0 64
/18 32768 32766 255.255.128.0 128
/16 65536 65534 255.255.0.0 256

 

 

Guide to sub-class C blocks

 

Network # IP Range Broadcast
.0 .1 - .126 .127
.128 .129 - .254 .255
/25 -- 2 Subnets -- 126 Hosts/Subnet

 


   
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