Subnet Calculator

Input
Network Address ? The first address in the subnet. It identifies the network itself and cannot be assigned to a host.
192.168.1.0
Broadcast Address ? The last address in the subnet. Packets sent here are delivered to all hosts on the network.
192.168.1.255
First Host
192.168.1.1
Last Host
192.168.1.254
Total Hosts
254
Subnet Mask
255.255.255.0
Wildcard Mask ? The inverse of the subnet mask. Used in ACLs and routing configs to specify which bits can vary.
0.0.0.255
CIDR Notation
192.168.1.0/24
IP Class
C
Private Address?
Yes (Private)
Binary Representation
IP: 11000000.10101000.00000001.00000000
Mask: 11111111.11111111.11111111.00000000
Common Subnets
CIDRSubnet MaskUsable Hosts
/32255.255.255.2551
/31255.255.255.2542
/30255.255.255.2522
/29255.255.255.2486
/28255.255.255.24014
/27255.255.255.22430
/26255.255.255.19262
/25255.255.255.128126
/24255.255.255.0254
/23255.255.254.0510
/22255.255.252.01022
/21255.255.248.02046
/20255.255.240.04094
/16255.255.0.065.534
/8255.0.0.016.777.214

About this tool

Enter an IP address and CIDR prefix length to instantly calculate network details including network address, broadcast address, host range, subnet mask, wildcard mask, and IP class. Includes a common subnet cheatsheet.

Related: IP Address Converter What Is My IP
Understanding CIDR notation

CIDR (Classless Inter-Domain Routing) notation combines an IP address with a prefix length (e.g., 192.168.1.0/24). The prefix length indicates how many bits of the address identify the network, with the remaining bits available for host addresses.

  • Network and broadcast address calculation
  • First and last usable host
  • Total usable hosts count
  • Subnet mask and wildcard mask
  • IP class detection (A/B/C/D/E)
  • Private vs public address identification
  • Binary representation
  • Common subnet cheatsheet

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