Subnet Calculator

IPv4 & IPv6 CIDR Planner

Host IP Address

Prefix / CIDR /24

Or Select Mask

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Usable Host IP Range

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Network Address

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Broadcast Address

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Total Hosts

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Usable Hosts

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Subnet Mask

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Wildcard Mask

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IP Class

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IP Type

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Binary Breakdown

Network Host

Mask

Net

Divide the current network block into smaller subnets.

Split To:

Subnet / CIDR	Usable Range	Broadcast	Hosts

Subnetting Reference Table (Cheat Sheet)

CIDR	Subnet Mask	Wildcard	Usable Hosts
/24	255.255.255.0	0.0.0.255	254
/25	255.255.255.128	0.0.0.127	126
/26	255.255.255.192	0.0.0.63	62
/27	255.255.255.224	0.0.0.31	30
/28	255.255.255.240	0.0.0.15	14
/29	255.255.255.248	0.0.0.7	6
/30	255.255.255.252	0.0.0.3	2 (Pt2Pt)
/16	255.255.0.0	0.0.255.255	65,534
/17	255.255.128.0	0.0.127.255	32,766
/18	255.255.192.0	0.0.63.255	16,382
/19	255.255.224.0	0.0.31.255	8,190
/20	255.255.240.0	0.0.15.255	4,094
/21	255.255.248.0	0.0.7.255	2,046
/22	255.255.252.0	0.0.3.255	1,022
/23	255.255.254.0	0.0.1.255	510
/8	255.0.0.0	0.255.255.255	16,777,214
/9	255.128.0.0	0.127.255.255	8,388,606
/10	255.192.0.0	0.63.255.255	4,194,302
/11	255.224.0.0	0.31.255.255	2,097,150
/12	255.240.0.0	0.15.255.255	1,048,574
/13	255.248.0.0	0.7.255.255	524,286
/14	255.252.0.0	0.3.255.255	262,142
/15	255.254.0.0	0.1.255.255	131,070