NRO Transfer Log Format

Transfer Log Information

Transfer log files can be obtained via FTP with the most current being available via JSON format. Examples for the files are provided on the FTP site and specifications are provided below.

Transfer log information is also available via the Statistics: Specified Transfers of Internet Number Resources page.

NRO Transfer Log Format

The NRO transfer log is a common format to publish IP address and Autonomous System transfers within RIRs and between RIRs. The format of this log accommodates the description of transfers by both an RIR and the aggregate of transfers from all RIRs by the NRO.

The serialization format of this log is JSON, and the JSON is formally defined using JSON Content Rules.

JSON Specification

The formal JSON specification can be found here. A full example can be found here.

File Naming Conventions and Processes

Each RIR will publish the transfer log on their FTP server (it should be noted, that each RIR makes the contents of their FTP server available via HTTP as well). Each RIR will create a /pub/stats/[RIR]/transfers directory, where “RIR” is the name of the RIR (e.g. APNIC, LACNIC, etc).

Within that directory there will be a file called transfers_latest.json. This file will be the cumulative transfer log and is expected grow over time.

Each RIR will also create archive directories based on the year in the YYYY format. The contents of the archive directories will contain snapshots of the transfers_latest.json file. Each snapshot file is to have a file name in the form of transfers_, followed by a UTC date/time stamp, followed by the .json file extension.

The format for the date/time stamp is to follow the RFC 3339 format but with the colon characters removed from the time portion for filename portability. This data/time stamp is to be specified as a UTC offset (using the ‘Z’ character).

The following is an example of the directory.