Ozdemir, Behlul Numan2025-03-222025-03-2220251865-04731865-0481https://doi.org/10.1007/s12145-025-01810-3https://hdl.handle.net/20.500.13091/9921Since the introduction of the Receiver Independent Exchange Format (RINEX) version 2 in 1990, the community of Global Navigation Satellite System (GNSS) rapidly adapted to its use and continued to develop the RINEX format. Because of its widespread adoption and user-friendly format across all GNSS receivers, GNSS companies typically offer conversion software that enables users to convert raw receiver-dependent data into the RINEX observation format. As new GNSS signals and constellations continue to emerge, revising the RINEX format has become a necessary requirement over time. RINEX SCAN is a new open-source software for multi-GNSS epoch and frequency (GNSS observation codes) scanning, providing availability information for epochs and frequencies in RINEX files. This software is free and open source, released under the MIT License., and written in object-oriented programming language C#. The software supports GPS, GLONASS, Galileo, BeiDou-2, BeiDou-3, and QZSS constellations data in RINEX observation 2.xx and 3.xx formats. Thanks to parallel computing architecture, users can easily obtain large-scale data quantity results for epochs and multi-GNSS frequencies when working with big data sets.eninfo:eu-repo/semantics/closedAccessEpochFrequenciesGnssQuantity CheckingMulti-GnssParallel ComputingRinexArticle10.1007/s12145-025-01810-32-s2.0-85219518203