O que é Subnetting?
Subnetting é o processo de dividir uma rede em duas ou mais redes mais pequenas. Melhora o fluxo de tráfego, segurança e simplifica a gestão da rede.
Notação CIDR Comum
- /32: Endereço IP único Single IP address
- /30: Link ponto-a-ponto (2 hosts utilizáveis) Point-to-point link (2 usable hosts)
- /24: Rede pequena padrão (254 hosts utilizáveis) Standard small network (254 usable
hosts)
- /16: Grande rede corporativa (65.534 hosts utilizáveis) Large corporate network (65,534 usable
hosts)
- /8: Rede muito grande (16,7M hosts utilizáveis) Very large network (16.7M usable hosts)
Computes network addresses, broadcast addresses, usable host ranges, and CIDR notation for IP subnets. Essential for network planning.
Key Facts
- /24 subnet has 254 usable IPs
- Private ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16
- Subnetting introduced in 1985 (RFC 950)
- CIDR replaced classful networking in 1993
Frequently Asked Questions
What is a subnet?
A logical division of an IP network into smaller segments for security, performance, and efficient IP usage.
What does /24 mean?
First 24 bits are network portion, 8 bits for hosts = 254 usable addresses.
How to calculate hosts?
Formula: 2^(32-prefix) - 2. For /24: 2^8 - 2 = 254 usable hosts.
Public vs private IP ranges?
Private (10.x, 172.16-31.x, 192.168.x) for internal use. Public IPs are globally unique for internet.