# M-lab Bandwidth
This data call returns a set of all the measured network bandwidths for a certain resource. The maximum time window for this datacall is 7 days.
The data is based on active host measurements collected by the Measurement Lab platform (M-Lab (opens new window)).
The bandwidth of a host is determined as the maximum network throughput value for all the tests/measurements performed by that host during the specified time period.
The value of the measurement throughput is computed as the number of octets transmitted between the host and the chosen M-Lab server, divided by their transfer time.
The measurements are commonly ran using the M-Lab Network Detection Tool (NDT (opens new window)), available as a stand-alone network speed test application, and also included in a popular BitTorrent client.
Note that due to the nature the data is processed data can be delayed for around two days at the beginning of each month!
The results published, including host details are covered by the M-Lab acceptable use policy (opens new window).
# Parameters
| Key | Value | Info | Required | Default value |
|---|---|---|---|---|
| resource | IPv4 Prefix, IPv4 address, IPv6 prefix, IPv6 address or country code | Defines the resource that the query is performed for. | YES | |
| starttime | ISO8601 or Unix timestamp | Defines the starttime for the query | NO | endtime - 7d |
| endtime | ISO8601 or Unix timestamp | Defines the endtime for the query | NO | today |
# Data Output
| Key | Info |
|---|---|
| bandwidths | List of observed bandwidths in Mbps units. One value per host. |
| query_starttime | Defines the start of the time interval covered in the query. |
| query_endtime | Defines the end of the time interval covered in the query. |
| resource | Defines the resource used in the query. |