FRED is open-source registry software for running domain and ENUM registries. Registry operators run it on their own infrastructure, either from pre-compiled binaries or by compiling the source themselves. The core is written in C, with PostgreSQL for storage and Python 3 for utilities. The documentation describes version v2026.1, released in February 2026.
FRED is developed by CZ.NIC, an interest association of legal entities based in Prague, Czech Republic, which operates the .cz registry and the MojeID service. The software is published under the GNU General Public License, so a registry can inspect and modify its source code. Because FRED runs on the operator's own infrastructure, the operator decides where registry data is stored; no vendor hosting is involved. Its direct users are domain and ENUM registry operators rather than end customers.