IPv4

This charts will help anyone seeking to know the Gateway, netmask, available IP address you can use on a specific IPV4 subnet.

Example: 23.238.0.8/29

The CDIR chart tells me the netmask for this /29 is 255.255.255.248
The /29 Subnet charts tell me that .8/29 gateway is .9 meaning that my gateway is 23.238.0.9
The /29 Subnet chart has 10-14 as the vailable IP address for this /29, so 5 usable IP.

This chart shows the Addresses for each subnet, their Hosts are the available IP that you can use, the netmask for the subnet you have.

CIDR chart

CIDR	Addresses	Hosts	Netmask	Amount of a Class C
/30	4	2	255.255.255.252	1/64
/29	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
/17	32768	32766	255.255.128.0	128
/16	65536	65534	255.255.0.0	256

/25 Subnet -- 126 Hosts

Network #	Gateway	Start-End
.0	.1	.2-.126
.128	.129	.130-.254

/26 Subnet -- 62 Hosts

/27 Subnet -- 30 Hosts

/28 Subnet -- 14 Hosts

/29 Subnet-- 6 Hosts

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