diff --git a/app/main.py b/app/main.py
index c63f7c3..6f7eeba 100644
--- a/app/main.py
+++ b/app/main.py
@@ -177,8 +177,8 @@ async def enriched(
 # ── Bulk Validator endpoints ──────────────────────────────────────────────────
 
 @app.post("/api/validator/start")
-async def validator_start(tld: str = Query(None)):
-    start_validator(tld_filter=tld or None)
+async def validator_start(tld: str = Query(None), rescan_dead: bool = Query(False)):
+    start_validator(tld_filter=tld or None, rescan_dead=rescan_dead)
     return get_validator_status()
 
 
diff --git a/app/static/index.html b/app/static/index.html
index fa6ecfb..6c6a59a 100644
--- a/app/static/index.html
+++ b/app/static/index.html
@@ -578,6 +578,10 @@ tr:hover td{background:rgba(255,255,255,.025)}
         <label>TLD filter <span style="font-weight:400;color:var(--muted)">(leave empty for all domains)</span></label>
         <input type="text" x-model="valTld" placeholder="es  or  com  or  ro" style="width:180px" :disabled="valSt.running">
       </div>
+      <label class="tog" style="padding-bottom:6px" :style="valSt.running?'opacity:.4':''">
+        <input type="checkbox" x-model="valRescan" :disabled="valSt.running">
+        <strong>Rescan dead</strong> <span>(recheck previously dead domains)</span>
+      </label>
       <button class="btn bs" :disabled="valSt.running" @click="startValidator()">▶ Start Validator</button>
       <button class="btn bd" :disabled="!valSt.running" @click="stopValidator()">⏹ Stop</button>
       <span x-show="valSt.running" style="font-size:11px;color:var(--accent2);padding-bottom:6px">⚡ Running…</span>
@@ -751,7 +755,7 @@ function app() {
     f: {tld:'',keyword:'',min_score:0,cms:'',live_only:false,alpha_only:false,no_sld:false,kit_digital_only:false,exclude_assessed:false,limit:'100',prescreen_status:'',niche:'',site_type:''},
     qst: {}, customDomains: '',
     valSt: {running:false,processed:0,live:0,dead:0,parked:0,redirect:0,skipped:0,offset:0,rate:0},
-    valTld: '',
+    valTld: '', valRescan: false,
     leadsQ: {quality:'', country:'', limit:'50'},
     leadsData: [], leadsTotal: 0, leadsPage: 1, leadsLoading: false,
     prescreening: false,
@@ -945,6 +949,7 @@ function app() {
     async startValidator() {
       const p = new URLSearchParams();
       if(this.valTld.trim()) p.set('tld', this.valTld.trim());
+      if(this.valRescan) p.set('rescan_dead', 'true');
       await fetch('/api/validator/start'+(p.toString()? '?'+p : ''), {method:'POST'});
       this.notify('Validator started', 'success');
       await this.loadValStatus();
diff --git a/app/validator.py b/app/validator.py
index 190dfde..edcf76a 100644
--- a/app/validator.py
+++ b/app/validator.py
@@ -161,15 +161,25 @@ def _get_domains_batch(offset: int, limit: int, tld: Optional[str]) -> list[str]
         return []
 
 
-async def _filter_unvalidated(domains: list[str]) -> list[str]:
-    """Return only domains that don't have a prescreen_status set yet."""
+async def _filter_unvalidated(domains: list[str], rescan_dead: bool = False) -> list[str]:
+    """Return domains that still need checking.
+
+    With rescan_dead=True, domains previously marked 'dead' are included
+    so they get a fresh check (useful after fixing the http/https bug).
+    """
     if not domains:
         return []
     placeholders = ",".join("?" * len(domains))
+    # A domain is "done" if it has a non-null prescreen_status that isn't dead
+    # (when rescan_dead=True) or any non-null status (normal mode).
+    if rescan_dead:
+        condition = "prescreen_status IS NOT NULL AND prescreen_status != 'dead'"
+    else:
+        condition = "prescreen_status IS NOT NULL"
     async with aiosqlite.connect(SQLITE_PATH) as db:
         async with db.execute(
             f"SELECT domain FROM enriched_domains "
-            f"WHERE domain IN ({placeholders}) AND prescreen_status IS NOT NULL",
+            f"WHERE domain IN ({placeholders}) AND {condition}",
             domains,
         ) as cur:
             already = {r[0] async for r in cur}
@@ -198,7 +208,7 @@ async def _save_batch(results: list[dict]):
         await db.commit()
 
 
-async def _validator_loop(tld_filter: Optional[str]):
+async def _validator_loop(tld_filter: Optional[str], rescan_dead: bool = False):
     global _val_stats
     _val_stats["running"] = True
     offset   = _val_stats["offset"]
@@ -226,7 +236,7 @@ async def _validator_loop(tld_filter: Optional[str]):
                 logger.info("Validator: dataset complete at offset=%d", offset)
                 break
 
-            to_check = await _filter_unvalidated(batch)
+            to_check = await _filter_unvalidated(batch, rescan_dead=rescan_dead)
             _val_stats["skipped"] += len(batch) - len(to_check)
             offset += len(batch)
             _val_stats["offset"] = offset
@@ -276,7 +286,7 @@ def get_validator_status() -> dict:
     return dict(_val_stats)
 
 
-def start_validator(tld_filter: Optional[str] = None):
+def start_validator(tld_filter: Optional[str] = None, rescan_dead: bool = False):
     global _val_task, _val_stats
     if _val_task and not _val_task.done():
         return  # already running
@@ -287,9 +297,10 @@ def start_validator(tld_filter: Optional[str] = None):
         processed=0, live=0, dead=0, parked=0,
         redirect=0, skipped=0, offset=0, rate=0.0,
         tld_filter=tld_filter,
+        rescan_dead=rescan_dead,
     )
-    _val_task = asyncio.create_task(_validator_loop(tld_filter))
-    logger.info("Validator started (tld=%s)", tld_filter)
+    _val_task = asyncio.create_task(_validator_loop(tld_filter, rescan_dead=rescan_dead))
+    logger.info("Validator started (tld=%s, rescan_dead=%s)", tld_filter, rescan_dead)
 
 
 def stop_validator():