diff --git a/bin/tests/system/conftest.py b/bin/tests/system/conftest.py
index 69d40837fd..4d603c0cfe 100644
--- a/bin/tests/system/conftest.py
+++ b/bin/tests/system/conftest.py
@@ -16,6 +16,8 @@ import pytest
 # ======================= LEGACY=COMPATIBLE FIXTURES =========================
 # The following fixtures are designed to work with both pytest system test
 # runner and the legacy system test framework.
+#
+# FUTURE: Rewrite the individual port fixtures to re-use the `ports` fixture.
 
 
 @pytest.fixture(scope="module")
@@ -53,12 +55,19 @@ if os.getenv("LEGACY_TEST_RUNNER", "0") == "0":
     from pathlib import Path
     import re
     import subprocess
+    import time
+
+    # Silence warnings caused by passing a pytest fixture to another fixture.
+    # pylint: disable=redefined-outer-name
 
     # ----------------------- Globals definition -----------------------------
 
     XDIST_WORKER = os.environ.get("PYTEST_XDIST_WORKER", "")
     FILE_DIR = os.path.abspath(Path(__file__).parent)
     ENV_RE = re.compile("([^=]+)=(.*)")
+    PORT_MIN = 5001
+    PORT_MAX = 32767
+    PORTS_PER_TEST = 20
 
     # ---------------------- Module initialization ---------------------------
 
@@ -119,3 +128,78 @@ if os.getenv("LEGACY_TEST_RUNNER", "0") == "0":
                 logging.error("failed to compile test files: %s", exc)
                 raise exc
             logging.debug(proc.stdout)
+
+    # --------------------------- Fixtures -----------------------------------
+
+    @pytest.fixture(scope="session")
+    def modules():
+        """Sorted list of all modules. Used to determine port distribution."""
+        mods = []
+        for dirpath, _dirs, files in os.walk(os.getcwd()):
+            for file in files:
+                if file.startswith("tests_") and file.endswith(".py"):
+                    mod = f"{dirpath}/{file}"
+                    mods.append(mod)
+        return sorted(mods)
+
+    @pytest.fixture(scope="session")
+    def module_base_ports(modules):
+        """
+        Dictionary containing assigned base port for every module.
+
+        Note that this is a session-wide fixture. The port numbers are
+        deterministically assigned before any testing starts. This fixture MUST
+        return the same value when called again during the same test session.
+        When running tests in parallel, this is exactly what happens - every
+        worker thread will call this fixture to determine test ports.
+        """
+        port_min = PORT_MIN
+        port_max = PORT_MAX - len(modules) * PORTS_PER_TEST
+        if port_max < port_min:
+            raise RuntimeError(
+                "not enough ports to assign unique port set to each module"
+            )
+
+        # Rotate the base port value over time to detect possible test issues
+        # with using random ports. This introduces a very slight race condition
+        # risk. If this value changes between pytest invocation and spawning
+        # worker threads, multiple tests may have same port values assigned. If
+        # these tests are then executed simultaneously, the test results will
+        # be misleading.
+        base_port = int(time.time() // 3600) % (port_max - port_min)
+
+        return {mod: base_port + i * PORTS_PER_TEST for i, mod in enumerate(modules)}
+
+    @pytest.fixture(scope="module")
+    def base_port(request, module_base_ports):
+        """Start of the port range assigned to a particular test module."""
+        port = module_base_ports[request.fspath]
+        return port
+
+    @pytest.fixture(scope="module")
+    def ports(base_port):
+        """Dictionary containing port names and their assigned values."""
+        return {
+            "PORT": str(base_port),
+            "TLSPORT": str(base_port + 1),
+            "HTTPPORT": str(base_port + 2),
+            "HTTPSPORT": str(base_port + 3),
+            "EXTRAPORT1": str(base_port + 4),
+            "EXTRAPORT2": str(base_port + 5),
+            "EXTRAPORT3": str(base_port + 6),
+            "EXTRAPORT4": str(base_port + 7),
+            "EXTRAPORT5": str(base_port + 8),
+            "EXTRAPORT6": str(base_port + 9),
+            "EXTRAPORT7": str(base_port + 10),
+            "EXTRAPORT8": str(base_port + 11),
+            "CONTROLPORT": str(base_port + 12),
+        }
+
+    @pytest.fixture(scope="module")
+    def env(ports):
+        """Dictionary containing environment variables for the test."""
+        env = CONF_ENV.copy()
+        env.update(ports)
+        env["builddir"] = f"{env['TOP_BUILDDIR']}/bin/tests/system"
+        env["srcdir"] = f"{env['TOP_SRCDIR']}/bin/tests/system"
+        return env