Free tool
IP subnet calculator
Enter an IPv4 address and drag the CIDR slider. The network address, broadcast, usable host range, subnet mask, wildcard, and host count update instantly. Free, and nothing leaves your browser.
| Network address | 192.168.1.0/24 |
| Subnet mask | 255.255.255.0 |
| Wildcard mask | 0.0.0.255 |
| Broadcast address | 192.168.1.255 |
| First usable host | 192.168.1.1 |
| Last usable host | 192.168.1.254 |
| Usable hosts | 254 |
| Total addresses | 256 |
Plan a network without counting bits by hand
Every AV and IT install ends up on a network: control processors, streaming endpoints, cameras, and switches all need addresses that do not collide. A subnet calculator turns a CIDR prefix into the exact usable range so you can hand out static IPs, size a DHCP scope, or check that two VLANs really are separate.
How CIDR works
- The prefix (e.g. /24) is how many leading bits are the network; the rest address hosts.
- /24 = 256 addresses, 254 usable · /25 = 128, 126 usable · /30 = 4, 2 usable.
- A /31 is a point-to-point link with both addresses usable; a /32 is a single host.
Running a real project? Avitly keeps the whole install, from the floor plan to the quote, in one place, so the network gear you spec on the plan is the gear that ends up on the offer.
Common questions
What does the /24 in an IP address mean?
It is CIDR notation for the subnet mask: the number of bits, counting from the left, that identify the network rather than the host. A /24 means the first 24 bits are the network, leaving 8 bits for hosts, which is the same as the mask 255.255.255.0 and gives 254 usable addresses.
Why are there two fewer usable hosts than addresses?
The first address in a subnet is the network address and the last is the broadcast address, so neither can be assigned to a device. A /24 holds 256 addresses but only 254 usable ones. The exceptions are /31, used for point-to-point links, and /32, a single host route.
What subnet should I use for an AV network?
A /24 out of a private range such as 192.168.10.0/24 fits most single-site installs and leaves 254 addresses, which is plenty for displays, amplifiers, DSPs, cameras, and control processors. Give AV its own VLAN rather than sharing the office subnet, so multicast audio traffic and discovery protocols stay off the corporate network.
How many hosts do I need for a Dante or AES67 network?
Count every device that takes an IP, then add headroom: Dante devices often expose a second interface in redundant mode, and control systems, switches, and access points all consume addresses. A /24 is standard. If you are pushing past 200 devices, move to a /23 rather than running two subnets, since audio discovery does not cross subnets without extra configuration.
What are the private IP ranges?
10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16, defined by RFC 1918. They are not routable on the public internet, so you can reuse them on every site. Pick a distinctive range per project rather than defaulting to 192.168.1.0/24, which collides with almost every consumer router when a VPN comes up.
What is the difference between a subnet mask and CIDR?
They express the same thing. The mask 255.255.255.0 written in binary is 24 ones followed by 8 zeros, which is why it is written /24 in CIDR. CIDR is shorter and is what modern equipment and documentation use; dotted-decimal masks survive in older interfaces and Windows dialogs.
This is built into Avitly. Same maths, running on your real project instead of numbers you retype.
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