This specification defines the construction of unique identifiers for data sources exchanged and archived in formats and services defined by the International Federation of Digital Seismograph Networks (FDSN) and related services and formats.

The FDSN defines, allocates and adopts a number of codes that, when combined in a hierarchy, uniquely identify a data source at a given time. The identifer is constructed by combining network, station, location and channel codes, where the channel code is further subdivided into band, source and subsource codes.

This specification defines the meaning and rules for these codes in addition to how they are to be combined into a URI-like pattern as follows:


This single-string identifier uniquely identifies a source in FDSN formats and services.