diff --git a/copyparty/__main__.py b/copyparty/__main__.py
index 9e9f13f4..2f568b5c 100644
--- a/copyparty/__main__.py
+++ b/copyparty/__main__.py
@@ -70,6 +70,8 @@ from .util import (
     expand_osenv_noop,
     expand_osenv_s,
     has_resource,
+    list_ips,
+    list_nics,
     load_resource,
     lprint,
     min_ex,
@@ -634,6 +636,9 @@ def get_sects():
             \033[32m-i fd:\033[33m3\033[0m uses the socket passed to copyparty on file descriptor 3
 
             \033[33m-p\033[0m (tcp ports) is ignored for unix-sockets and FDs
+
+            \033[33m--list-nics\033[0m shows all network adapters (also offline ones);
+            \033[33m--list-ips\033[0m shows all LAN IPs
             """
             ),
         ],
@@ -1358,6 +1363,8 @@ def add_network(ap):
     ap2.add_argument("--s-wr-slp", metavar="SEC", type=float, default=0.0, help="debug: socket write delay in seconds")
     ap2.add_argument("--rsp-slp", metavar="SEC", type=float, default=0.0, help="debug: response delay in seconds")
     ap2.add_argument("--rsp-jtr", metavar="SEC", type=float, default=0.0, help="debug: response delay, random duration 0..\033[33mSEC\033[0m")
+    ap2.add_argument("--list-nics", action="store_true", help="debug: list detected network adapters")
+    ap2.add_argument("--list-ips", action="store_true", help="debug: list detected LAN IPs")
 
 
 def add_tls(ap, cert_path):
@@ -2124,6 +2131,14 @@ def main(argv: Optional[list[str]] = None) -> None:
         print("\n".join("%8s %s" % (k, v) for k, v in sorted(MIMES.items())))
         sys.exit(0)
 
+    if "--list-ips" in argv:
+        print("\n".join(str(x) for x in sorted(list_ips())))
+        sys.exit(0)
+
+    if "--list-nics" in argv:
+        print("\n".join(str(x) for x in sorted(list_nics(True).items())))
+        sys.exit(0)
+
     if EXE:
         print("pybin: {}\n".format(pybin), end="")
 
diff --git a/copyparty/tcpsrv.py b/copyparty/tcpsrv.py
index 73fc7448..1518381d 100644
--- a/copyparty/tcpsrv.py
+++ b/copyparty/tcpsrv.py
@@ -23,6 +23,7 @@ from .util import (
     atomic_move,
     chkcmd,
     get_adapters,
+    list_nics,
     min_ex,
     sunpack,
     termsize,
@@ -461,23 +462,7 @@ class TcpSrv(object):
     def detect_interfaces(self, listen_ips: list[str]) -> dict[str, Netdev]:
         listen_ips = [x for x in listen_ips if not x.startswith(("unix:", "fd:"))]
 
-        nics = get_adapters(True)
-        eps: dict[str, Netdev] = {}
-        for nic in nics:
-            for nip in nic.ips:
-                ipa = nip.ip[0] if ":" in str(nip.ip) else nip.ip
-                sip = "{}/{}".format(ipa, nip.network_prefix)
-                nd = Netdev(sip, nic.index or 0, nic.nice_name, "")
-                eps[sip] = nd
-                try:
-                    idx = socket.if_nametoindex(nd.name)
-                    if idx and idx != nd.idx:
-                        t = "netdev idx mismatch; ifaddr={} cpython={}"
-                        self.log("tcpsrv", t.format(nd.idx, idx), 3)
-                        nd.idx = idx
-                except:
-                    pass
-
+        eps = list_nics()
         netlist = str(sorted(eps.items()))
         if netlist == self.netlist and self.netdevs:
             return {}
diff --git a/copyparty/util.py b/copyparty/util.py
index 6138aeae..c4eb0766 100644
--- a/copyparty/util.py
+++ b/copyparty/util.py
@@ -3176,6 +3176,31 @@ def list_ips() -> list[str]:
     return list(ret)
 
 
+def list_nics(alll: bool = False) -> dict[str, Netdev]:
+    nics = get_adapters(alll)
+    eps: dict[str, Netdev] = {}
+    for nic in nics:
+        name = nic.nice_name
+        try:
+            idx = socket.if_nametoindex(name)
+            if idx and idx != nic.index:
+                LOG[0]("#", "nic-idx mismatch; ifaddr=%r libc=%r" % (nic.index, idx), 3)
+        except:
+            idx = nic.index
+
+        for nip in nic.ips:
+            ipa = nip.ip[0] if ":" in str(nip.ip) else nip.ip
+            sip = "%s/%s" % (ipa, nip.network_prefix)
+            nd = Netdev(sip, idx or 0, name, "")
+            eps[sip] = nd
+
+        if alll and not nic.ips:
+            zs = "no-ip-%s" % (idx,)
+            eps[zs] = Netdev(zs, idx or 0, name, "")
+
+    return eps
+
+
 def build_netmap(csv: str, defer_mutex: bool = False):
     csv = csv.lower().strip()