How many IP addresses does a /24 subnet have?

A /24 contains 256 addresses, of which 254 are usable — the first is the network address and the last is the broadcast address. It's the most common subnet size for small networks and camera VLANs.

Should security cameras be on their own VLAN or subnet?

Yes. A dedicated camera VLAN isolates surveillance traffic from business data, lets you block cameras from reaching the internet, and prevents a compromised camera from touching the rest of the network. A /24 handles up to 254 cameras and recorders.

IP Subnet Calculator

Q: What is CIDR notation?

CIDR notation appends the number of network bits to an address — 192.168.1.0/24 means the first 24 bits identify the network, leaving 8 bits (256 addresses) for hosts. Larger prefix numbers mean smaller subnets.

Enter any IPv4 address with a CIDR prefix to get the network address, broadcast, subnet mask and usable host range — handy when carving out camera VLANs, access control subnets and management networks.

Address & prefix

IPv4 address

Any address inside the subnet works — e.g. a camera's IP.

CIDR prefix / subnet mask

Common picks: /24 for a site LAN or camera VLAN · /28 for a small device subnet · /30 for point-to-point links.

Subnet details

—

network address

Subnet mask—

Wildcard mask—

Broadcast address—

Usable host range—

Usable hosts—

Total addresses—

IP class / type—

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Subnetting a security network

Most integrators standardize on a pattern like this per site: a management VLAN for switches and servers, a camera VLAN sized for the camera count plus growth, an access control VLAN, and a voice VLAN for VoIP. Keeping cameras in their own subnet means one firewall rule blocks every camera from the internet — the single most effective hardening step for IP video.

Quick prefix reference

Prefix	Mask	Usable hosts	Typical use
/30	255.255.255.252	2	Point-to-point links
/29	255.255.255.248	6	Tiny device groups
/28	255.255.255.240	14	Small device subnet
/26	255.255.255.192	62	Mid-size VLAN
/24	255.255.255.0	254	Site LAN / camera VLAN
/23	255.255.254.0	510	Large camera estates
/22	255.255.252.0	1022	Campus networks

Frequently asked questions

How many usable IPs in a /24?

254 — 256 total minus the network and broadcast addresses.

Should cameras be on their own VLAN?

Yes. Isolation contains compromised devices, simplifies firewall rules, and keeps multicast/streaming traffic away from business data.

What is CIDR notation?

The /N suffix is the number of network bits: /24 = 255.255.255.0. Bigger N = smaller subnet.

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