No more googling for subnet cheat sheet

As server guy who does not deal with subnet masks on a daily basis, whenever I need to find the mask of a given CIDR, I google for “subnet cheat sheet”. As this blog is meant to be “personal cookbook” first, why not create the cheat sheet right here, I thought. I was able to calculate the no. of hosts in my head upto 8190 🙂

CIDR Subnet Mask Hosts
/8 255.0.0.0 16777214
/9 255.128.0.0 8388606
/10 255.192.0.0 4194302
/11 255.224.0.0 2097150
/12 255.240.0.0 1048574
/13 255.248.0.0 524286
/14 255.252.0.0 262142
/15 255.254.0.0 131070
/16 255.255.0.0 65534
/17 255.255.128.0 32766
/18 255.255.192.0 16382
/19 255.255.224.0 8190
/20 255.255.240.0 4094
/21 255.255.248.0 2046
/22 255.255.252.0 1022
/23 255.255.254.0 510
/24 255.255.255.0 254
/25 255.255.255.128 126
/26 255.255.255.192 62
/27 255.255.255.224 30
/28 255.255.255.240 14
/29 255.255.255.248 6
/30 255.255.255.252 2
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