Help Center/ Anti-DDoS Service/ FAQs/ CNAD Advanced FAQs/ Billing/ How Is Elastic Bandwidth Charged?
Updated on 2025-07-14 GMT+08:00

How Is Elastic Bandwidth Charged?

Billing Rules

The elastic bandwidth fees in different scenarios are described as follows:

  • Actual service bandwidth ≤ Service bandwidth: No elastic service bandwidth fee is generated.
  • Service bandwidth < Actual service bandwidth < Elastic bandwidth: Elastic bandwidth fees will be generated.
  • Actual service bandwidth ≥ Elastic service bandwidth: Elastic service bandwidth fees will be generated.

Billing Principles

Elastic bandwidth can be billed in two modes: daily 95th percentile billing and monthly 95th percentile billing.

  • Daily 95th percentile billing

    The bandwidth is sampled every 5 minutes on a calendar day. The sampling vertices are sorted in descending order of peak values, the maximum value of 5% is removed, and the maximum value among the remaining values is used as the charged bandwidth. Figure 1 describes how to calculate the daily 95th percentile billing bandwidth.

    Figure 1 Daily 95th percentile billing
  • Monthly 95th percentile billing

    The bandwidth is sampled every 5 minutes in a calendar month. The sampling vertices are sorted in descending order of the peak value, the maximum value of 5% is removed, and the maximum value among the remaining values is used as the charged bandwidth. Figure 2 shows how to calculate the monthly 95th percentile bandwidth for 30 days.

    Figure 2 Monthly 95th percentile billing