diff --git a/pkgs/by-name/gs/gsan/package.nix b/pkgs/by-name/gs/gsan/package.nix
new file mode 100644
index 0000000000000..8217d4b1c3c2a
--- /dev/null
+++ b/pkgs/by-name/gs/gsan/package.nix
@@ -0,0 +1,42 @@
+{
+  lib,
+  fetchFromGitHub,
+  python3,
+}:
+
+python3.pkgs.buildPythonApplication rec {
+  pname = "gsan";
+  version = "5.0.0";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "franccesco";
+    repo = "getaltname";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-Os/NappuvdadGqCouF5vhvPhRnu1SLpii+Esq0C1j48=";
+  };
+
+  build-system = with python3.pkgs; [ setuptools ];
+
+  dependencies = with python3.pkgs; [
+    cryptography
+    pyasn1
+    pyopenssl
+    rich
+    typer
+  ];
+
+  # Project has no tests
+  doCheck = false;
+
+  pythonImportsCheck = [ "gsan" ];
+
+  meta = {
+    description = "Tool to extract subdomains from SSL certificates in HTTPS sites";
+    homepage = "https://github.com/franccesco/getaltname";
+    changelog = "https://github.com/franccesco/getaltname/releases/tag/v${version}";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ fab ];
+    mainProgram = "gsan";
+  };
+}