IP Subnet Calculator
Domande Frequenti
Tutto quello che devi sapere sulle subnet IP
Cos'è una subnet mask?
La subnet mask definisce quale parte di un indirizzo IP identifica la rete e quale l'host. Es: /24 (255.255.255.0) significa che i primi 24 bit identificano la rete e gli ultimi 8 bit identificano gli host (256 indirizzi, di cui 254 utilizzabili).
Cosa sono network address e broadcast?
Il network address è il primo indirizzo della subnet (identifica la rete stessa, non assegnabile ad host). Il broadcast address è l'ultimo (usato per inviare pacchetti a tutti gli host nella subnet). Gli host utilizzabili sono tutti gli indirizzi tra questi due estremi.
Come scegliere la subnet giusta?
/24 = 254 host (reti aziendali standard), /25 = 126 host, /26 = 62 host, /27 = 30 host, /28 = 14 host, /29 = 6 host, /30 = 2 host (link point-to-point), /32 = 1 host (singolo IP). Scegli in base al numero di dispositivi previsto con un po' di margine.
What is a subnet mask?
It says which part of an IP address identifies the network and which identifies the machine. A /24, that is 255.255.255.0, means the first 24 bits are the network and the last 8 the hosts: 254 usable addresses.
What are the network and broadcast addresses?
The network address is the first in the subnet and identifies the network itself, so it goes to no machine. The broadcast is the last and sends a packet to everyone at once. The usable hosts are all those in between.
How do I pick the right subnet?
From the number of devices expected, with room to spare: /24 gives 254 hosts, /25 gives 126, /26 sixty-two, /27 thirty, /28 fourteen, /29 six, /30 two for point to point links, and /32 a single address.
Does my data stay private?
Yes, and not because we promise it: this tool runs entirely inside your browser. What you type or upload never leaves your device, so it never reaches a server of ours and there is nothing we could keep, read or lose. You can check it yourself: open the page, disconnect from the internet, and the tool keeps working.
Do you store what I enter?
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Do you profile me? Are you GDPR compliant?
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If it is free, how do you make money?
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