IPv4 IP Calculadora
Enter an IPv4 address and a CIDR prefix to calculate subnet details instantly: network address, broadcast, usable host range, subnet mask, and more.
What is an IP calculadora?
An IP calculadora is a tool that helps you convert a simple IP + CIDR input into practical subnet information you can actually use in network planning. Instead of manually doing binary math, an IP calculator gives you results in seconds.
This page focuses on IPv4 subnet calculations, which are common in home labs, office networks, cloud VPC design, and exam preparation (CCNA, Network+, and similar paths).
Why this matters in real life
Subnetting is not just academic. It affects how reliable, secure, and scalable your environment is. With the right subnet size, you can avoid wasted addresses and prevent painful redesigns later.
- Home lab: segment devices, servers, and IoT gear cleanly.
- Business LAN: isolate departments and reduce broadcast noise.
- Cloud networking: create VPC subnets that leave room for growth.
- Troubleshooting: quickly verify if hosts are in the same subnet.
How to use this calculator
Step 1: Enter an IPv4 address
Type a valid address like 10.0.4.18 or 172.16.55.101.
Step 2: Enter a CIDR prefix
Use a number from 0 to 32. Common values include:
/24→ 255.255.255.0/16→ 255.255.0.0/30→ 255.255.255.252 (often for point-to-point links)
Step 3: Click Calculate
You will immediately see the network details, including usable host range and binary representation of the entered IP.
Understanding the output fields
- Subnet Mask: dotted-decimal mask derived from CIDR.
- Wildcard Mask: inverse of subnet mask (used in ACL logic).
- Network Address: first address in the subnet block.
- Broadcast Address: last address in the subnet block (except special handling in /31 and /32 contexts).
- Usable Host Range: host addresses assignable to devices.
- Total / Usable Addresses: size of the subnet block.
Quick subnet sizing reference
Useful CIDR values
/24: 256 total, 254 usable/25: 128 total, 126 usable/26: 64 total, 62 usable/27: 32 total, 30 usable/28: 16 total, 14 usable/29: 8 total, 6 usable/30: 4 total, 2 usable
Common mistakes to avoid
- Confusing network address with a host address.
- Assigning the broadcast address to a device.
- Using a subnet that is too small for future growth.
- Forgetting special behavior for
/31and/32.
Final thoughts
If you work with routers, firewalls, DHCP scopes, VLANs, or cloud networks, a reliable IP calculator saves time and reduces configuration errors. Bookmark this page and use it whenever you need quick, accurate IPv4 subnet results.