Subnet Mask Cheatsheet Generator

Generate a reference table of subnet masks with CIDR notation, wildcard masks, and number of usable hosts for each.

CIDR	Subnet Mask	Wildcard	Total Hosts	Usable Hosts	Network Bits
/0	0.0.0.0	255.255.255.255	4,294,967,296	4,294,967,294	0
/1	128.0.0.0	127.255.255.255	2,147,483,648	2,147,483,646	1
/2	192.0.0.0	63.255.255.255	1,073,741,824	1,073,741,822	2
/3	224.0.0.0	31.255.255.255	536,870,912	536,870,910	3
/4	240.0.0.0	15.255.255.255	268,435,456	268,435,454	4
/5	248.0.0.0	7.255.255.255	134,217,728	134,217,726	5
/6	252.0.0.0	3.255.255.255	67,108,864	67,108,862	6
/7	254.0.0.0	1.255.255.255	33,554,432	33,554,430	7
/8	255.0.0.0	0.255.255.255	16,777,216	16,777,214	8
/9	255.128.0.0	0.127.255.255	8,388,608	8,388,606	9
/10	255.192.0.0	0.63.255.255	4,194,304	4,194,302	10
/11	255.224.0.0	0.31.255.255	2,097,152	2,097,150	11
/12	255.240.0.0	0.15.255.255	1,048,576	1,048,574	12
/13	255.248.0.0	0.7.255.255	524,288	524,286	13
/14	255.252.0.0	0.3.255.255	262,144	262,142	14
/15	255.254.0.0	0.1.255.255	131,072	131,070	15
/16	255.255.0.0	0.0.255.255	65,536	65,534	16
/17	255.255.128.0	0.0.127.255	32,768	32,766	17
/18	255.255.192.0	0.0.63.255	16,384	16,382	18
/19	255.255.224.0	0.0.31.255	8,192	8,190	19
/20	255.255.240.0	0.0.15.255	4,096	4,094	20
/21	255.255.248.0	0.0.7.255	2,048	2,046	21
/22	255.255.252.0	0.0.3.255	1,024	1,022	22
/23	255.255.254.0	0.0.1.255	512	510	23
/24	255.255.255.0	0.0.0.255	256	254	24
/25	255.255.255.128	0.0.0.127	128	126	25
/26	255.255.255.192	0.0.0.63	64	62	26
/27	255.255.255.224	0.0.0.31	32	30	27
/28	255.255.255.240	0.0.0.15	16	14	28
/29	255.255.255.248	0.0.0.7	8	6	29
/30	255.255.255.252	0.0.0.3	4	2	30
/31	255.255.255.254	0.0.0.1	2	2	31
/32	255.255.255.255	0.0.0.0	1	1	32

Showing 33 of 33entries — All values calculated for a 32-bit address space

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Applications

A quick-reference cheatsheet for network engineers and developers who need to look up subnet mask values, wildcard masks, and usable host counts for any CIDR prefix from /0 to /32.

How It Works

Displays all 33 possible CIDR prefixes (/0 through /32) with their dotted-decimal subnet mask, inverse wildcard mask, total host count, and usable host count (total minus network and broadcast addresses).

Fun Fact: A /32 subnet contains only one IP address and is commonly used for point-to-point links and router loopback interfaces.

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