Calculadora de Sub-rede Online Grátis
IP subnet mask, network/broadcast address, usable hosts and CIDR notation
The Subnet Calculator breaks down any IPv4 address and CIDR prefix into its network address, broadcast address, subnet mask, and usable host range. Network engineers, system administrators, and students preparing for CCNA or CompTIA Network+ exams use it to plan IP address allocation without manual binary arithmetic. Enter an address like 192.168.1.0/24 and get every value you need in under a second.
Frequently Asked Questions
Sobre Esta Calculadora
Subnetting is the practice of dividing a single IP network into smaller, logically isolated segments. A /24 network gives 254 usable addresses, while a /26 gives 62 — choosing the right size prevents wasted addresses and limits broadcast traffic that degrades network performance.
Network engineers use subnets to implement security zones, separate VLANs, and control routing between departments. Getting the math wrong — even by one bit — can cause IP conflicts or unreachable hosts. This calculator eliminates that risk by computing every derived value from the CIDR notation you already know.
Whether you're planning a home lab, sitting for a certification exam, or designing a corporate LAN, the Subnet Calculator gives you the network address, broadcast address, subnet mask in both dotted-decimal and binary, wildcard mask, and the exact count of usable hosts — all without touching a calculator or opening a subnet cheat sheet.
A Calculadora de Sub-rede divide qualquer endereço IPv4 nas suas informações de rede essenciais, ideal para engenheiros e estudantes.
Exemplo Resolvido
Subnetting a /26 network for an office floor
Entradas:
- IP Address: 10.0.0.64
- Prefix Length: /26 (subnet mask 255.255.255.192)
Passo a Passo:
- Block size = 256 − 192 = 64
- Network address = 10.0.0.64 (first address in block)
- Broadcast address = 10.0.0.127 (last address in block: 64 + 64 − 1)
- Usable host range = 10.0.0.65 → 10.0.0.126
- Total usable hosts = 2^(32−26) − 2 = 64 − 2 = 62 hosts
Dicas
- CIDR /24 = 254 usable hosts, /16 = 65,534 hosts, /8 = 16,777,214 hosts.