diff --git a/wifi_deauth.py b/wifi_deauth.py
index 76c0ac4..41320de 100644
--- a/wifi_deauth.py
+++ b/wifi_deauth.py
@@ -1,10 +1,63 @@
 #!/usr/bin/env python3
-"""airodump-ng CSV parser for the wifi deauth tool (+ a hardware-free selftest)."""
+"""airodump-ng CSV parsing + wireless-interface discovery for the wifi deauth tool."""
 import os
+import re
+import subprocess
 import sys
 import tempfile
 
 
+def run(cmd, timeout=30):
+    return subprocess.run(cmd, capture_output=True, text=True, timeout=timeout)
+
+
+def list_wifi_interfaces():
+    """[{iface, phy, type, addr, monitor_capable}] from `iw dev`."""
+    try:
+        out = run(["iw", "dev"]).stdout
+    except Exception:
+        return []
+    ifaces, cur_phy, cur = [], None, None
+    for line in out.splitlines():
+        m = re.match(r"phy#(\d+)", line)
+        if m:
+            cur_phy = "phy" + m.group(1)
+        m = re.match(r"\s+Interface (\S+)", line)
+        if m:
+            if cur:
+                ifaces.append(cur)
+            cur = {"iface": m.group(1), "phy": cur_phy, "type": "?", "addr": "?"}
+        m = re.match(r"\s+addr (\S+)", line)
+        if m and cur:
+            cur["addr"] = m.group(1)
+        m = re.match(r"\s+type (\S+)", line)
+        if m and cur:
+            cur["type"] = m.group(1)
+    if cur:
+        ifaces.append(cur)
+    for it in ifaces:
+        it["monitor_capable"] = _phy_has_monitor(it["phy"])
+    return ifaces
+
+
+def _phy_has_monitor(phy):
+    if not phy:
+        return False
+    out = run(["iw", phy, "info"]).stdout
+    grab = False
+    for line in out.splitlines():
+        if "Supported interface modes:" in line:
+            grab = True
+            continue
+        if grab:
+            if re.match(r"\s+\*", line):
+                if "monitor" in line:
+                    return True
+            else:
+                break
+    return False
+
+
 def parse_airodump_csv(path):
     try:
         with open(path, encoding="utf-8", errors="replace") as f: