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21tunnel
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About 21tunnel
21tunnel provides public URLs for localhost services and supports HTTP, TCP, and SSH protocols. It offers a hosted dashboard with request inspection, audit logs, and RBAC across all tiers. The service features master-key delegation for AI agents, allowing autonomous operation with scoped, short-lived child keys and instant cascade revocation. Users can mint project-specific keys with configurable TTLs and manage tunnels via a single static binary available on Linux, Windows, and macOS. Custom domains are supported on free and paid tiers, with edge authentication via Google OAuth and domain allowlists. The platform emphasizes security with MFA, RBAC, and audit logs included from the free tier. Request inspection streams in real-time over WebSocket, with replay functionality planned for future releases.
Key features
- HTTP, TCP, and SSH tunneling
- Master-key delegation for AI agents
- Real-time request inspection with WebSocket streaming
- Custom domains and edge authentication
- RBAC and audit logs
- Sticky random subdomains
- Bring-your-own domain support
- Single static binary for Linux, Windows, and macOS
Use cases
- Exposing localhost services for AI coding agents
- Secure remote access to development environments
- Team collaboration with RBAC and audit logging
Pros
- Master-key delegation for AI agents with scoped child keys
- Request inspection with real-time streaming over WebSocket
- RBAC and audit logs included on all tiers
- Custom domains and edge authentication available
- Single static binary supporting multiple platforms
Cons
- No free custom domains on Hobby tier
- Limited to 3 concurrent tunnels on free tier
- No API access mentioned
- Request replay gated behind future allowlists
Frequently asked questions about 21tunnel
What is 21tunnel and who is it designed for?
21tunnel provides public URLs for localhost services and supports HTTP, TCP, and SSH protocols. It is designed for AI agents and development teams, offering features like autonomous operation with scoped keys and real-time request inspection.
How does 21tunnel work with AI agents?
Users mint a master key once, and AI assistants can autonomously mint short-lived child keys with configurable TTLs to open tunnels and perform tasks. Master keys can be instantly revoked, cascading to all child keys and tunnels.
What protocols does 21tunnel support?
21tunnel supports HTTP, TCP, and SSH protocols, allowing users to expose different types of localhost services through public URLs.
Does 21tunnel offer a hosted dashboard?
Yes, 21tunnel includes a hosted dashboard with features like request inspection, audit logs, and RBAC across all tiers.
Can I use my own domain with 21tunnel?
Yes, 21tunnel allows users to bring their own domains, which are verified via ACME challenges and bound to tunnels.
What authentication options are available for tunnels?
21tunnel supports edge authentication via Google OAuth and domain allowlists to gate access to tunnels before traffic reaches localhost.
