Co to jest Subnetting?
Subnetting to proces dzielenia sieci na dwie lub więcej mniejszych sieci. Poprawia przepływ ruchu, bezpieczeństwo i upraszcza zarządzanie siecią.
Powszechna Notacja CIDR
- /32: Pojedynczy adres IP Single IP address
- /30: Łącze punkt-punkt (2 użyteczne hosty) Point-to-point link (2 usable hosts)
- /24: Standardowa mała sieć (254 użyteczne hosty) Standard small network (254 usable
hosts)
- /16: Duża sieć korporacyjna (65,534 użytecznych hostów) Large corporate network (65,534 usable
hosts)
- /8: Bardzo duża sieć (16.7M użytecznych hostów) 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.