Subnet Mask Cheat Sheet

October 26, 2025 at 10:37 AM

Official Post

	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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Guide to sub-class C blocks

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