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HOW TO

A free DHCP server for Windows

For when the job is: Give a device an address on a link with no DHCP.

A switch on the bench, a phone that needs to register before it will do anything, an access point waiting for an address before it will talk to a controller. None of them will come up on a bare link with nothing handing out addresses, and putting them on the production network to get one is often exactly what you are not allowed to do.

CySecTek includes a DHCP server for that job. It starts from the app, serves a pool you choose on the adapter you choose, and stops when you are finished — no Windows Server role, no service left installed on a laptop that goes to a different site tomorrow.

What CySecTek does here

  • Starts and stops from the app; nothing is installed as a Windows service and nothing survives a reboot you did not ask for.
  • Bind it to one adapter, which is the part that matters on a laptop with Wi-Fi, Ethernet and two virtual adapters — you do not want to start answering DHCP on the customer's LAN by accident.
  • Set the pool, gateway, DNS and lease time, and watch leases appear as devices take them.
  • A TFTP server in the same app, so a device can get an address and then fetch its firmware or config without a second tool.

What it will not do

  • Anything permanent. This is for a bench and a callout, not for running a network — use the DHCP service on your server or router for that.
  • DHCP reservations, option 82, failover, or a database of leases that outlives the session.
  • IPv6. The server is IPv4 only.

Questions

Will it interfere with the network's real DHCP server?
It can, which is why binding it to a specific adapter matters. Point it at the isolated link you are staging on, not the interface facing the production LAN.
Does it need administrator rights?
Yes. DHCP uses port 67, which is privileged on Windows.
Can I see what took a lease?
Yes — leases are listed as they are handed out, which is usually how you confirm the device actually came up.

Free, and one download

CySecTek 0.7.0 for Windows 10 and 11, 64-bit. No account, no licence key, no paid tier. The installer's SHA-256 is published beside it so you can verify what you downloaded.

Download CySecTek

All product names are trademarks of their respective owners, referenced here only to describe comparable functionality. CySecTek is not affiliated with or endorsed by them.