Intro to i6.shark#

i6.shark is an IPv6 proxy server that allows you to make HTTP requests from randomly generated IPv6 addresses in a /48 subnet. This is the proxy currently powering Wyzie Subs in production.

A /48 subnet has 1,208,925,819,614,629,174,706,176 (1.2 × 10²⁴) IPv6 addresses, making it virtually impossible to block through traditional IP banning. Using a single subnet means those who really want to block you can block your ASN address, so be careful with that.

Features#

• Random IPv6 Generation: Creates random IPv6 addresses from your /48 prefix for each request
• Full HTTP Method Support: GET, POST, PUT, DELETE, and all other HTTP methods
• HMAC-SHA256 Authentication: Secure API key authentication using user-agent based tokens
• Intelligent IP Pool Management:
  • Automatic IP rotation with configurable pool size
  • Smart IP lifecycle management (add, track usage, auto-flush)
  • Per-IP request counting with automatic rotation after max requests
  • Unused IP cleanup based on inactivity threshold
• Advanced Request Handling:
  • Custom header forwarding via JSON query parameter
  • Cloudflare and CDN header stripping for anonymity
  • Support for multiple URL parameter formats (?url=, ?destination=, or path-based)
  • Optional fallback to system default IP with ?normal parameter
• Host Whitelisting: Built-in domain whitelist for security (configurable in code)
• Automatic Maintenance:
  • Periodic IP pool flushing (hourly by default)
  • Subnet validation and cleanup
  • Connection pooling and keepalive optimization
• High Performance:
  • Concurrent request handling with buffer pooling
  • Configurable timeouts and connection limits
  • Efficient IPv6 address management via netlink
• Debug Mode: Detailed logging for troubleshooting and monitoring

Requirements#

• Go 1.20 or higher
• Linux/Unix system with IPv6 support (preferably Ubuntu)
• Root privileges (for port 80 binding and IPv6 manipulation)
• IPv6 /48 subnet allocation from your hosting provider

Hosting Providers#

The following providers are known to offer /48 IPv6 subnets: