Tailscale DNS IPv6 spells 'Tailscale'
The gist
Tailscale's IPv6 range fd7a:115c:a1e0::/48 contains "7a:115c:a1e", which reads as "Tailscale".
The mesh VPN provider's address block hides a calculator-style easter egg.
How it unfolded
- Mar 24, 2025A GitHub issue reports that Tailscale's MagicDNS only provides an IPv6 or an IPv4 resolver at any one time, and that DNS over pure IPv6 fails when Tailscale is enabled.
- Mar 20, 2026A configuration guide states Tailscale assigns IPv6 addresses from the fd7a:115c:a1e0::/48 range.
- Nov 10, 2026A Reddit post notes the IPv6 range contains "7a:115c:a1e", which spells out "Tailscale" (7a115ca1e).
Key terms
- IPv6
- The newest version of the Internet Protocol, designed to replace IPv4 and solve its address shortage.
- WireGuard
- A communication protocol and open-source software implementing encrypted virtual private networks, passing traffic over UDP.
Source: Wikipedia