Suggest an editImprove this articleRefine the answer for “What is a broadcast address?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**A broadcast address** is a special IP address used to send a packet to all devices within a single network (subnet). **Key point:** a broadcast address means "send to all hosts on this network".Shown above the full answer for quick recall.Answer (EN)Image**A broadcast address** is a **special IP address** used to send a packet **to all devices within a single network (subnet)**. Short and clear: **a broadcast address means "send to all hosts on this network"**. --- ## What a broadcast address means technically In IPv4, every IP address is divided into: - a **network part** - a **host part** **A broadcast address** is an address in which: - the entire **host part consists of ones (1)** It denotes **all devices of the given network at once**. --- ## Example (IPv4) Network: ``` 192.168.1.0/24 ``` - network part: `192.168.1` - host part: the last octet Then: - the **broadcast address**: ``` 192.168.1.255 ``` The address `192.168.1.255`: - cannot be assigned to a device - is used only for broadcast delivery --- ## How broadcast works When a packet is sent to a broadcast address: 1. The packet enters the local network 2. It is delivered to **all devices on that subnet** 3. Each device: - receives the packet - decides whether it needs it Important: - broadcast **does not go beyond the subnet** - routers **do not forward broadcast packets** --- ## Where broadcast is used Broadcast is applied when: - the sender **does not know the recipient's address** - **all devices on the network** need to be notified Typical examples: - **ARP requests** - some service network protocols - initial device discovery --- ## IPv4 vs IPv6 Important for an interview - **IPv4**: - broadcast **exists** - **IPv6**: - broadcast **is absent** - **multicast** is used instead --- ## What is important to remember - a broadcast address: - belongs to the **network layer** - is used **only within a single subnet** - is not assigned to hosts - every subnet has **its own broadcast address**For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.