@NFTCPS: Tailscale does something counterintuitive, launching Tailcat. In a nutshell: Tailscale without Tailscale. No account registration, no VPN installation, no port opening, no root required, and it doesn't alter your routing or DNS. Two machines, send a short t…

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Summary

Tailcat is an open-source tool launched by Tailscale that allows direct connection between two machines via WireGuard end-to-end encryption without account registration or VPN installation, supporting file transfer, SSH, and proxy functions.

Tailscale itself has done something counterintuitive, launching Tailcat. In a nutshell: Tailscale without Tailscale. No account registration, no VPN installation, no port opening, no root required, and it doesn't alter your routing or DNS. Two machines, send a short token, and they connect directly, with full WireGuard end-to-end encryption. If the direct connection works, it uses it; if not, it automatically falls back to DERP relay without any delay. What can you do after connecting? Let me list them: Transfer files between two computers Expose local ports SSH directly into it Use as a SOCKS5 proxy Use as an exit node Also transfer files via browser Written in Go, entirely in userspace, officially open-source. Like netcat, but using Tailscale's data plane. https://tailscale.github.io/tailcat/
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Cached at: 08/30/26, 04:10 PM

Tailscale has released a counter-intuitive tool called Tailcat, simply put: Tailscale without Tailscale. No account registration, no VPN installation, no port opening, no root access required, and it doesn’t modify your routes or DNS. Just two machines, send a short token, and they connect directly with end-to-end WireGuard encryption. If a direct connection works, it uses it; if not, it automatically falls back to DERP relays without any delay.

What can you do once connected? Here’s a list:

  • Transfer files between two computers
  • Expose local ports
  • SSH directly into the machine
  • Use as a SOCKS5 proxy
  • Set up as an exit node
  • Transfer files right from the browser

Written in Go, running entirely in userspace, and officially open-sourced. Think of it like netcat, but over Tailscale’s data plane.
https://tailscale.github.io/tailcat/


tailcat

Source: https://tailscale.github.io/tailcat/

This is an experimental demo of tailcat in the browser. Unlike the normal CLI and non-JS library versions, all of its traffic is relayed through DERP servers; browsers can’t make tailcat’s direct peer-to-peer connections without WebRTC support (issue #4).

Loading WebAssembly…

Receive

Create a listener, share its address out of band, then the other side sends with this page or the CLI:
tailcat < file

Reuse a persistent address (stored in this browser)
Share this address:

Send

Paste the receiver’s address. The receiver can be this page on another machine, or the CLI:
tailcat > file

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