diff --git a/httpd.py b/httpd.py
index 60d7017..6b9eb2b 100644
--- a/httpd.py
+++ b/httpd.py
@@ -31,6 +31,13 @@ except (ImportError, IOError, ValueError):
     _geodb = None
     _geolite = False
 
+# ASN lookup (optional)
+try:
+    import pyasn
+    _asndb = pyasn.pyasn(os.path.join("data", "ipasn.dat"))
+except (ImportError, IOError):
+    _asndb = None
+
 # Rate limiting configuration
 _rate_limits = defaultdict(list)
 _rate_lock = threading.Lock()
@@ -604,7 +611,7 @@ def submit_proxy_reports(db, worker_id, proxies):
             ''', (proxy_key, ip, port, proto, now_int, now_int, latency, now_int,
                   checktype, target))
 
-            # Geolocate if IP2Location available
+            # Geolocate and ASN lookup
             if _geolite and _geodb:
                 try:
                     rec = _geodb.get_all(ip)
@@ -614,6 +621,15 @@ def submit_proxy_reports(db, worker_id, proxies):
                             (rec.country_short, proxy_key))
                 except Exception:
                     pass
+            if _asndb:
+                try:
+                    asn_result = _asndb.lookup(ip)
+                    if asn_result and asn_result[0]:
+                        db.execute(
+                            'UPDATE proxylist SET asn=? WHERE proxy=?',
+                            (asn_result[0], proxy_key))
+                except Exception:
+                    pass
 
             # Track per-URL working count for working_ratio
             if source_url: