Network Address Calculator
Find the network address (first IP) of any IPv4 subnet. Enter an IP and CIDR (e.g. 10.10.0.50/20) and see the network address, subnet mask, and broadcast instantly. Runs in your browser.
Get the Network Address
Enter any IPv4 address and CIDR (e.g. 10.10.0.50/20), then click Get network.
Result
| Subnet mask | 255.255.240.0 |
|---|---|
| Network address | 10.10.0.0 |
| Wildcard | 0.0.15.255 |
| Broadcast address | 10.10.15.255 |
What Is a Network Address?
The network address (also called network ID or subnet address) is the first address in an IP subnet. In binary, it has all host bits set to 0. It represents the subnet itself and is not assigned to any device. Together with the broadcast address (last address, all host bits 1), it bookends the range of usable host addresses.
You calculate it by performing a bitwise AND between the IP address and the subnet mask. For example, 192.168.1.100 with mask 255.255.255.0 yields network 192.168.1.0. Our subnet calculator does this for any IP and CIDR. The broadcast address calculator covers the last address; the IP range calculator covers the full range. For CIDR basics, see CIDR calculator.
How to Calculate Network Address
Given an IP and prefix length (e.g. 172.16.5.10/22), compute the subnet mask from the prefix, then AND the IP with the mask. This tool accepts IP and CIDR and displays the network address, broadcast, mask, and wildcard. For wildcard masks used in ACLs, use the wildcard mask calculator. For IPv6 subnets, use the IPv6 subnet calculator.
Why the Network Address Matters
Routing tables and firewall rules often reference the network address or the CIDR block. Knowing the exact network ID avoids misconfiguration and overlap between subnets. Pair our calculators with IP lookup for geolocation, IP address validator to validate addresses, or ping test and traceroute for connectivity.
FAQs
What is a network address?
The network address is the first address in a subnet. All host bits are 0. It identifies the subnet and is not assigned to any host.
How do I find the network address?
Perform a bitwise AND between the IP and the subnet mask. Or use our subnet calculator: enter IP and CIDR to get the network address.
Can I use the network address as a host IP?
No. The network address and broadcast address are reserved. Only addresses between them are usable for hosts.
What is the difference between network address and gateway?
The network address is the subnet identifier. The gateway (usually the router) is often the first or last usable host (e.g. .1 or .254 in a /24) but can be any host in the subnet.