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IP Subnet Architect

The ultimate subnetting calculator, wildcard converter, and binary translator. Enter your IP and CIDR mask below to instantly decode the entire network boundary without doing the math on paper.

Subnet Engine

Reverse Engineering Tools

1. Design by Host Requirement

Find the exact mask needed to fit a specific number of computers without wasting IP addresses.

Awaiting input...

2. Subnet Mask Decoder

Translate old-school dotted-decimal masks back into CIDR.

Awaiting input...

Subnetting Cheat Sheet

IPv4 Classes & Default Ranges

  • Class A: 1.0.0.0 - 126.x.x.x (Default /8)
  • Class B: 128.0.0.0 - 191.255.x.x (Default /16)
  • Class C: 192.0.0.0 - 223.255.255.x (Default /24)

Private IP Spaces (RFC 1918)

Only use these IPs on internal networks! They cannot route on the internet.

  • Class A: 10.0.0.0 - 10.255.255.255
  • Class B: 172.16.0.0 - 172.31.255.255
  • Class C: 192.168.0.0 - 192.168.255.255
NETWORK ADDRESS
192.168.1.0
The mathematical ID of this zone. Cannot be assigned to a PC.
BROADCAST ADDRESS
192.168.1.255
The shout-out address. Pinging this alerts every PC in the subnet.
BINARY SUBNET TRANSLATION
IP: 
11000000.10101000.00000001.00001010
Mask: 
11111111.11111111.11111111.00000000
Net: 
11000000.10101000.00000001.00000000
FIRST USABLE IP
192.168.1.1
Gateway IP
LAST USABLE IP
192.168.1.254
Server/Host IP
TOTAL HOSTS
254
Usable Devices
SUBNET MASK
255.255.255.0
Standard formatting for PCs
WILDCARD MASK
0.0.0.255
Inverse format for OSPF & ACLs