What should I do if my Clash subscription link expires?

Contact the airport provider to renew or obtain a new subscription link, then update the subscription URL in your client and manually refresh.

How can I determine if an airport is secure?

Check the provider's privacy policy for a clear no-log statement, prioritize airports that support TLS-encrypted subscription links, and refer to community reviews.

How do I filter nodes when there are too many in the subscription?

Use the client's speed test feature (e.g., Clash's latency test) to filter low-latency nodes, or configure proxy-groups with automatic selection strategies like url-test.

A Complete Guide to Airport Subscription Services: From Clash Link Formats to Essential Security Protocols

2/20/2026 · 2 min

What Are Airport Subscription Services?

Airport subscription services provide proxy server configurations via subscription links. After purchasing a subscription, users receive a link containing multiple node details, which can be imported into clients like Clash or Surge for immediate use. The core advantage is that users do not need to manually configure each node; the client automatically updates the node list, greatly simplifying the workflow.

Clash Subscription Link Formats Explained

Clash subscription links typically start with https:// and return a response containing YAML or base64-encoded configurations. Common formats include:

YAML Format: Directly returns a Clash configuration file with fields such as proxies, proxy-groups, and rules.
Base64 Encoding: The configuration content is base64-encoded before transmission, and the client decodes it for use.
Hybrid Format: Some airports use custom formats, such as the clash:// protocol, but HTTPS links remain mainstream.

Example Subscription Link

https://example.com/sub?token=abc123&flag=clash

This link returns a Clash-compatible YAML configuration. Users should pay attention to the flag parameter to ensure the correct format is returned.

Best Practices for Subscription Management

Regular Subscription Updates

Airport nodes may become invalid due to IP blocking or server maintenance. It is recommended to enable automatic updates (e.g., every 24 hours). Clash supports the update-interval parameter, which can be specified in the configuration file.

Merging Multiple Subscriptions

When using multiple airports, you can merge subscriptions via Clash's proxy-providers feature. For example:

proxy-providers:
  provider1:
    type: http
    url: "https://example1.com/sub"
    interval: 3600
  provider2:
    type: http
    url: "https://example2.com/sub"
    interval: 3600

Then reference these providers in proxy-groups.

Node Filtering and Speed Testing

Subscriptions often contain numerous nodes. Use the client's built-in speed testing features (e.g., Clash's Proxy Provider health check) to filter nodes with low latency and high speed.

Security Risks and Protective Measures

Privacy Leakage Risks

Airport providers may log user activity, including target domains and IP addresses. Choose providers with a strict no-log policy and prioritize subscription links that support TLS encryption.

Man-in-the-Middle Attacks

Insecure subscription links can be tampered with, inserting malicious nodes. Always use HTTPS links and verify certificate validity. Avoid using third-party subscription conversion services from untrusted sources.

Client Security

Keep clients like Clash updated to the latest version to patch known vulnerabilities. Avoid using cracked clients, as they may contain backdoors.

Conclusion

Airport subscription services greatly simplify proxy usage, but users must understand link formats, master management techniques, and prioritize security. With proper configuration and careful selection, users can enjoy high-speed networks while safeguarding privacy and security.