Čo je subnetting?
Subnetting je proces rozdelenia siete na dve alebo viac menších sietí. Zlepšuje tok prevádzky, bezpečnosť a zjednodušuje správu siete.
Bežná notácia CIDR
- /32: Jedna IP adresa Single IP address
- /30: Point-to-point linka (2 použiteľné hosty) Point-to-point link (2 usable hosts)
- /24: Štandardná malá sieť (254 použiteľných hostov) Standard small network (254 usable
hosts)
- /16: Veľká firemná sieť (65 534 použiteľných hostov) Large corporate network (65,534 usable
hosts)
- /8: Veľmi veľká sieť (16,7 milióna použiteľných hostov) 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.