Wake-on-LAN Packet Generator
Generate Wake-on-LAN magic packets in hexadecimal and binary forms.
Wake-on-LAN Packet Generator
What This Tool Does
- Wake-on-LAN (WOL) is an industry-standard networking protocol that allows computer systems to be powered on or awakened from standby mode by a network message. This protocol is invaluable for system administrators, DevOps teams, and home-lab hobbyists who manage remote servers, workstation clusters, or storage devices. Instead of physically pressing power buttons, operators trigger power cycles remotely using network commands.
- The core of the Wake-on-LAN protocol is the magic packet. The magic packet is a broadcast frame containing a payload of 102 bytes: first, 6 bytes of constant hexadecimal FF (representing a synchronization prefix), followed by 16 repetitions of the target network interface's 48-bit MAC address. This packet is typically sent as a UDP datagram over port 9 or port 7 to the broadcast address of the local network segment. When the target system's network card detects this specific sequence, it triggers the system's power supply to turn on the machine.
- The ScriptPulse Wake-on-LAN Packet Generator allows developers to input a MAC address and generate the corresponding magic packet payload. It works entirely client-side, keeping MAC addresses secure and local, protecting internal server identifiers from network exposure.
How It Works
- The tool validates that the input MAC address is a valid 48-bit address (validating octet counts and hex characters).
- It constructs the binary payload: first, it writes 6 bytes of 0xFF to a byte array.
- It then loops 16 times, appending the 6 bytes of the parsed MAC address to the array in each iteration.
- The resulting 102-byte array is formatted into hexadecimal representation (with spaces or as a continuous string) and binary array outputs, making it ready to be copied.
Usage
- Enter a valid target MAC address.
- Generate the magic packet payload bytes.
- Copy hex output into your network tooling flow.
Examples
- Prepare WOL payloads for remote lab boot scripts.
- Validate magic packet construction in integration tests.
- Generate continuous magic packet hex for network utilities.
Real-World Use Cases
- Debugging Wake-on-LAN client systems by verifying correct magic packet construction.
- Integrating raw magic packet payloads into network diagnostics scripts and automation workflows.
- Constructing magic packet hexadecimal sequences for custom network controller interfaces.
- Setting up testing frameworks for network adapters to verify magic packet parsing.
- Writing custom system startup utilities in Python, Go, or Node.js by copying the generated payload bytes.
Best Practices
- Ensure the target system's BIOS/UEFI and network card properties are configured to allow Wake-on-LAN power triggers.
- Send magic packets to the local subnet broadcast address rather than a single IP address.
- Use UDP port 9 as the default port for transmitting magic packets across networks.
- Configure router IP-directed broadcasts if you need to wake systems from outside the local subnet.
- Keep a database of target system MAC addresses secure to prevent unauthorized system wake triggers.
Common Mistakes
- Forgetting that standard routers block broadcast packets from cross-subnet routes unless specifically configured for IP-directed broadcasts.
- Failing to enable WOL configurations in the target system's OS device manager properties.
- Using a multicast MAC address as the target Wake-on-LAN MAC address.
- Retaining double hyphens or colon formatting characters in the raw magic packet hex body.
- Expecting WOL to work on systems connected via Wi-Fi; standard WOL requires a wired Ethernet connection unless the system explicitly supports Wake-on-Wireless-LAN (WoWLAN).
Limitations
- Results should be validated in your target runtime before production use.
- Extremely large input payloads may be constrained by browser memory and performance limits.
Technical Reference Guide
- Magic Packet Structure: 6 bytes of 0xFF synchronization prefix followed by 16 repetitions of the target NIC's 48-bit MAC address.
- UDP Transmission: Magic packets are broadcast as UDP datagrams over port 9, port 7, or port 0.
- Directed Broadcasts: Sending packets across subnets by targeting the subnet broadcast address (e.g., 10.0.0.255) rather than the global 255.255.255.255.
FAQ
What is a Wake-on-LAN magic packet?
A magic packet is a special broadcast packet containing 6 bytes of 0xFF followed by 16 repetitions of the target device's MAC address.
Which ports does Wake-on-LAN use?
Wake-on-LAN typically uses UDP ports 7 or 9, though the packet can be sent on any UDP port or directly as an Ethernet frame.
Does Wake-on-LAN work over Wi-Fi?
Generally no. Wake-on-LAN requires a constant physical connection. Some modern adapters support Wake-on-Wireless-LAN (WoWLAN), but it requires special hardware support.
Can I wake a computer from a remote network?
Yes, by using IP-directed broadcasts or a VPN tunnel to send the magic packet to the target local subnet broadcast domain.
How do I enable Wake-on-LAN in Windows?
Enable it in your motherboard's BIOS/UEFI under power management and in the Windows Device Manager under your network adapter's power properties.
Does this tool send the wake signal directly?
No. Web browsers cannot send raw UDP broadcast packets due to security sandboxing rules. This tool generates the packet payload bytes, which you can use in local scripts or network utilities.
Why is UDP port 9 the standard for WOL?
Port 9 is historically designated for discard protocol and network wake signals, but any UDP port works since the hardware card parses the packet payload directly.
What is the difference between WOL and WoWLAN?
WOL works on wired physical Ethernet connections, while WoWLAN operates over wireless networks using special low-power Wi-Fi cards.
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