Calcoli CIDR IPv4 e IPv6 /649 min di letturaAggiornato il
Calcolatore di sottoreti IPv4 e IPv6: Guida all'architettura di rete CIDR
Comprendi le subnet mask binarie, calcola indirizzi di rete e broadcast e gestisci prefissi IPv6 /64.
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Punti essenziali
- Un indirizzo IPv4 ha 32 bit divisi in 4 ottetti; il prefisso CIDR definisce la parte di rete.
- L'indirizzo di rete ha tutti i bit host impostati a 0; l'indirizzo di broadcast li ha tutti a 1.
- Il numero di host utilizzabili è calcolato con la formula 2^(32 - CIDR) - 2.
- IPv6 impiega indirizzi a 128 bit, con il prefisso /64 come standard di riferimento per le subnet utente.
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Calcola subnet e intervalli CIDR
Ottieni istantaneamente maschere di rete, indirizzi broadcast, capacità host e notazione binaria.
- IPv4 CIDR prefixes /8 to /32
- Network & broadcast address math
- Usable IP host range calculator
- Binary bitwise mask visualizer
01.Binary Arithmetic & Bitwise Masking in IPv4 Networks
An IPv4 address consists of 32 binary bits. Subnet masks (e.g., 255.255.255.0 or /24) perform a bitwise logical AND with the IP address to isolate the Network ID from the Host ID. For example, 192.168.1.55 AND 255.255.255.0 yields the network address 192.168.1.0.
02.Calculating Usable Hosts, Wildcard Masks & Ranges
For a given prefix length N, the host bit count is H = 32 - N. Total addresses equal 2^H, while usable host addresses equal 2^H - 2. The Wildcard Mask is the bitwise inverse of the subnet mask (e.g., 0.0.0.255 for /24), commonly used in Cisco ACLs and OSPF configurations.
How to Calculate Subnets and IP Ranges
Step-by-step subnet calculation workflow.
1
Enter IP Address
Type your target IPv4 address (e.g., 10.0.0.1 or 192.168.10.0).
2
Select CIDR Prefix or Mask
Choose the subnet mask from the CIDR dropdown (/8 to /32).
3
Inspect Network Coordinates
Review the calculated Network Address, Broadcast Address, and Subnet Mask.
4
Check Usable Host Range
View the exact first usable IP, last usable IP, and total assignable host count.
Frequently Asked Questions
The first address is reserved as the Network ID (all host bits 0), and the last address is reserved as the Broadcast address (all host bits 1).