Network Engineering Tool
Advanced Subnet Mask Calculator
Calculate subnet masks, CIDR notation, network address, broadcast address, usable host range, wildcard mask, binary mask, total addresses, usable hosts, and subnet sizing details for IPv4 networks.
Enter your IPv4 network details
Enter an IPv4 address and CIDR prefix. You can also calculate the closest prefix needed for a target number of usable hosts or subnets.
Formula used:
Total addresses = 2(32 − prefix)
Usable hosts = Total addresses − 2, except /31 and /32 special cases
Subnet mask = first prefix bits set to 1
Wildcard mask = inverse of subnet mask
Network address = IP address AND subnet mask
Broadcast address = Network address OR wildcard mask
Host range = first usable address to last usable address
Total addresses = 2(32 − prefix)
Usable hosts = Total addresses − 2, except /31 and /32 special cases
Subnet mask = first prefix bits set to 1
Wildcard mask = inverse of subnet mask
Network address = IP address AND subnet mask
Broadcast address = Network address OR wildcard mask
Host range = first usable address to last usable address
Network Address
0.0.0.0/0
Usable Host Range
0.0.0.0 – 0.0.0.0
Subnet Mask
0.0.0.0
Wildcard Mask
255.255.255.255
Usable Hosts
0
Input IP address
0.0.0.0
CIDR notation
/0
Subnet mask
0.0.0.0
Wildcard mask
255.255.255.255
Network address
0.0.0.0
Broadcast address
0.0.0.0
First usable host
0.0.0.0
Last usable host
0.0.0.0
Total addresses
0
Usable hosts
0
Binary subnet mask
00000000.00000000.00000000.00000000
Address type / class reference
N/A
Closest prefix for required hosts
N/A
Subnetting from parent prefix
N/A
This calculator is designed for IPv4 subnet planning. For production network design, also verify routing policy, VLAN design, DHCP scope, NAT, firewall rules, reserved gateway addresses, high availability addresses, and cloud provider subnet restrictions.
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