IP Address Subnet Calculator

IP Address

CIDR / Subnet Mask

Results

CIDR Notation

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Network Class

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Subnet Mask

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Wildcard Mask

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Hex IP Address

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Binary Subnet Mask

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Network Address

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Broadcast Address

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Total Addresses

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Usable Hosts

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Usable Host Range

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Subnet Splitter (VLSM)

Divide a parent network into equal-sized subnets, either by specifying how many networks you need or how many usable hosts each subnet must support. Hover over any network/CIDR value to see its subnet mask.

Parent Network Address

Parent CIDR

Number of Networks Needed

#	Network	Usable Host Range	Broadcast Address	Usable Hosts

IPv4 Class Reference

Class	Address Range	Default Mask	CIDR	Typical Use
A	1.0.0.0 - 126.255.255.255	255.0.0.0	/8	Large networks
B	128.0.0.0 - 191.255.255.255	255.255.0.0	/16	Medium networks
C	192.0.0.0 - 223.255.255.255	255.255.255.0	/24	Small networks
D	224.0.0.0 - 239.255.255.255	N/A	N/A	Multicast
E	240.0.0.0 - 255.255.255.255	N/A	N/A	Experimental / reserved

Non-Routable Private IP Addresses (RFC 1918 & Related)

These address blocks are reserved for internal, private use and are never routed on the public Internet. Anyone can freely use them inside their own network without registration — devices using these addresses reach the internet only through NAT (Network Address Translation) at the network edge.

Range	Address Range	Default Mask	CIDR	Typical Use
10.x	10.0.0.0 - 10.255.255.255	255.0.0.0	/8	Large private networks (RFC 1918)
172.16.x	172.16.0.0 - 172.31.255.255	255.240.0.0	/12	Medium private networks (RFC 1918)
192.168.x	192.168.0.0 - 192.168.255.255	255.255.0.0	/16	Small private networks / home routers (RFC 1918)
100.64.x	100.64.0.0 - 100.127.255.255	255.192.0.0	/10	Carrier-Grade NAT / ISP shared address space (RFC 6598)
169.254.x	169.254.0.0 - 169.254.255.255	255.255.0.0	/16	Link-local / APIPA auto-assigned addresses (RFC 3927)
127.x	127.0.0.0 - 127.255.255.255	255.0.0.0	/8	Loopback (localhost)