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Networks & subnets
Subnet mask calculators & table

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• Networks & subnets
Subnet mask calculators & table
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Network calculators
For technical writers dealing with subnetting a good network calculator can be really handy:

•	Sparkman´s World Network Calculator Good stuff. My colleagues and I have used this network calculator so many times I am surprised we haven´t worn it completely out...
•	Cotse.Net´s Subnet Mask Calculator Decent subnet mask calculator. Slightly simpler layout that the Sparkman´s.

Subnet mask table
The below table can be useful when dealing with subnets. The table lists how many hosts and networks will be available when using a specific subnet mask:

Bits	Subnet mask	Hosts	Nets
8	255.0.0.0	16777214	1
9	255.128.0.0	8388606	2
10	255.192.0.0	4194302	4
11	255.224.0.0	2097150	8
12	255.240.0.0	1048574	16
13	255.248.0.0	524286	32
14	255.252.0.0	262142	64
15	255.254.0.0	131070	128
16	255.255.0.0	65534	1
17	255.255.128.0	32766	2
18	255.255.192.0	16382	4
19	255.255.224.0	8190	8
20	255.255.240.0	4094	16
21	255.255.248.0	2046	32
22	255.255.252.0	1022	64
23	255.255.254.0	510	128
24	255.255.255.0	254	1
25	255.255.255.128	126	2
26	255.255.255.192	62	4
27	255.255.255.224	30	8
28	255.255.255.240	14	16
29	255.255.255.248	6	32
30	255.255.255.252	2	64
31	255.255.255.254	-	-
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