EVERYDAY CLARITY
Network Address Calculator
Find the IPv4 network boundary from an address and CIDR prefix length.
Your result
Network
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| IP address | IPv4 |
| Prefix length | integer 0..32 |
Understanding your result
The output applies the selected format or address convention. Encoding is not encryption; a valid address representation does not establish availability, reachability or security.
Common mistakes
- Using a different alphabet, padding, base, delimiter or address-prefix convention than the tool expects.
Check your calculation
- Where a reverse operation exists, round-trip a short known example. Compare structural results with the reference example rather than executing decoded text.
Calculation checks, sources and review limits
What is the network address for this IPv4 address and prefix?
Find the IPv4 network boundary from an address and CIDR prefix length.
Common uses
- Find the IPv4 network boundary from an address and CIDR prefix length.
How it works
network=unsignedIPv4 & prefixMask
Worked example
Enter IP address: 10.20.30.40; Prefix length: 16. The result is Network: 10.20.0.0.
FAQ
What is the network address for this IPv4 address and prefix?
network=unsignedIPv4 & prefixMask
What assumptions and limits apply?
This specific lookup can be a subnet calculator mode; do not automatically publish a redundant page.