diff --git a/selfdrive/debug/debug_fw_fingerprinting_offline.py b/selfdrive/debug/debug_fw_fingerprinting_offline.py
index 8ae9d6d347..3df2924738 100755
--- a/selfdrive/debug/debug_fw_fingerprinting_offline.py
+++ b/selfdrive/debug/debug_fw_fingerprinting_offline.py
@@ -1,11 +1,12 @@
 #!/usr/bin/env python3
 import argparse
 
+from openpilot.tools.lib.live_logreader import live_logreader
 from openpilot.tools.lib.logreader import LogReader, ReadMode
 from panda.python import uds
 
 
-def main(route: str, addrs: list[int]):
+def main(route: str | None, addrs: list[int]):
   """
   TODO:
   - highlight TX vs RX clearly
@@ -13,7 +14,10 @@ def main(route: str, addrs: list[int]):
   - print as fixed width table, easier to read
   """
 
-  lr = LogReader(route, default_mode=ReadMode.RLOG, sort_by_time=True)
+  if route is None:
+    lr = live_logreader()
+  else:
+    lr = LogReader(route, default_mode=ReadMode.RLOG, sort_by_time=True)
 
   start_mono_time = None
   prev_mono_time = 0
@@ -28,7 +32,7 @@ def main(route: str, addrs: list[int]):
 
     if msg.which() in ("can", 'sendcan'):
       for can in getattr(msg, msg.which()):
-        if can.address in addrs:
+        if can.address in addrs or not len(addrs):
           if msg.logMonoTime != prev_mono_time:
             print()
             prev_mono_time = msg.logMonoTime
@@ -38,8 +42,8 @@ def main(route: str, addrs: list[int]):
 
 if __name__ == "__main__":
   parser = argparse.ArgumentParser(description='View back and forth ISO-TP communication between various ECUs given an address')
-  parser.add_argument('route', help='Route name')
-  parser.add_argument('addrs', nargs='*', help='List of tx address to view (0x7e0 for engine)')
+  parser.add_argument('route', nargs='?', help='Route name, live if not specified')
+  parser.add_argument('--addrs', nargs='*', default=[], help='List of tx address to view (0x7e0 for engine)')
   args = parser.parse_args()
 
   addrs = [int(addr, base=16) if addr.startswith('0x') else int(addr) for addr in args.addrs]