diff --git a/Changes b/Changes
index 6332ad65..d573a5ab 100644
--- a/Changes
+++ b/Changes
@@ -3,12 +3,13 @@
   [ENHANCEMENTS]
 
   * #319 better fix for acceping ACL names or values in check_acl_*
+  * #311 added duplicate devices report with option to delete
 
   [BUG FIXES]
 
   * #320 DNS subroutines are redefined
   * #318 ACLs with RegExp are very slow - aggressive resolver timeouts
-  * #317 when renumbering on discover, delete likely duplicate devices
+  * #317 #265 #311 when renumbering on discover, delete likely duplicate devices
   * #316 Neighbor map should fall back to device sysname after dns
 
 2.036001 - 2017-06-22
diff --git a/lib/App/Netdisco/Web/Plugin/AdminTask/DuplicateDevices.pm b/lib/App/Netdisco/Web/Plugin/AdminTask/DuplicateDevices.pm
new file mode 100644
index 00000000..bd50dc9f
--- /dev/null
+++ b/lib/App/Netdisco/Web/Plugin/AdminTask/DuplicateDevices.pm
@@ -0,0 +1,40 @@
+package App::Netdisco::Web::Plugin::AdminTask::DuplicateDevices;
+
+use Dancer ':syntax';
+use Dancer::Plugin::Ajax;
+use Dancer::Plugin::DBIC;
+use Dancer::Plugin::Auth::Extensible;
+
+use App::Netdisco::Web::Plugin;
+
+register_admin_task({
+  tag => 'duplicatedevices',
+  label => 'Duplicate Devices',
+});
+
+ajax '/ajax/control/admin/duplicatedevices/delete' => require_role admin => sub {
+    my $ip = NetAddr::IP::Lite->new(param('ip'));
+    send_error('Bad Request', 400) unless ($ip and $ip->addr ne '0.0.0.0');
+    forward '/ajax/control/admin/delete', { device => param('ip') };
+};
+
+ajax '/ajax/content/admin/duplicatedevices' => require_role admin => sub {
+    my @set = schema('netdisco')->resultset('Device')->search({
+      serial => { '-in' => schema('netdisco')->resultset('Device')->search({
+          '-and' => [serial => { '!=', undef }, serial => { '!=', '' }],
+        }, {
+          group_by => ['serial'],
+          having => \'count(*) > 1',
+          columns => 'serial',
+        })->as_query
+      },
+    }, { columns => [qw/ip dns contact location name model os_ver serial/] })
+      ->with_times->hri->all;
+
+    content_type('text/html');
+    template 'ajax/admintask/duplicatedevices.tt', {
+      results => \@set
+    }, { layout => undef };
+};
+
+true;
diff --git a/share/config.yml b/share/config.yml
index a594c44f..0425f214 100644
--- a/share/config.yml
+++ b/share/config.yml
@@ -71,6 +71,7 @@ web_plugins:
   - AdminTask::SlowDevices
   - AdminTask::UndiscoveredNeighbors
   - AdminTask::OrphanedDevices
+  - AdminTask::DuplicateDevices
   - AdminTask::TimedOutDevices
   - AdminTask::UserLog
   - AdminTask::Users
diff --git a/share/views/ajax/admintask/duplicatedevices.tt b/share/views/ajax/admintask/duplicatedevices.tt
new file mode 100644
index 00000000..5b7f76bf
--- /dev/null
+++ b/share/views/ajax/admintask/duplicatedevices.tt
@@ -0,0 +1,77 @@
+[% IF NOT results.size %]
+<div class="span4 alert alert-info">No duplicate devices found.</div>
+[% ELSE %]
+<table id="data-table" class="table table-striped table-bordered" width="100%" cellspacing="0">
+  <thead>
+    <tr>
+      <th class="nd_center-cell">Device IP</th>
+      <th class="nd_center-cell">Contact</th>
+      <th class="nd_center-cell">Location</th>
+      <th class="nd_center-cell">System Name</th>
+      <th class="nd_center-cell">Model</th>
+      <th class="nd_center-cell">OS Version</th>
+      <th class="nd_center-cell">Serial</th>
+      <th class="nd_center-cell">Last Discovered</th>
+      <th class="nd_center-cell">Delete</th>
+    </tr>
+  </thead>
+  </tbody>
+    [% FOREACH row IN results %]
+    <tr>
+      <td class="nd_center-cell"><a class="nd_linkcell"
+        href="[% uri_for('/device') %]?tab=details&q=[% row.ip | uri %]">[% row.ip | html_entity %]</a>
+        [% row.dns | html_entity %]</td>
+      <td class="nd_center-cell">[% row.contact  | html_entity %]</td>
+      <td class="nd_center-cell">[% row.location | html_entity %]</td>
+      <td class="nd_center-cell">[% row.name     | html_entity %]</td>
+      <td class="nd_center-cell">[% row.model    | html_entity %]</td>
+      <td class="nd_center-cell">[% row.os_ver   | html_entity %]</td>
+      <td class="nd_center-cell">[% row.serial   | html_entity %]</td>
+      <td class="nd_center-cell">[% row.last_discover_stamp | html_entity %]</td>
+
+      <td class="nd_center-cell">
+        <button class="btn btn-danger btn-small"
+          data-toggle="modal" data-target="#nd_devdel" type="button">
+          <i class="icon-trash text-danger"></i>
+        </button>
+
+        <div id="nd_devdel" class="nd_modal nd_deep-horizon modal hide fade" tabindex="-1"
+          role="dialog" aria-labelledby="nd_devdel-label" aria-hidden="true">
+          <div class="modal-header">
+            <button type="button" class="close" data-dismiss="modal" aria-hidden="true">x</button>
+            <h3 id="nd_devdel-label">Confirm Delete: [% row.ip || row.dns | html_entity %]</h3>
+          </div>
+          <div class="modal-body">
+            <blockquote>
+              <ul>
+                <li><p>This action is immediate and not reversible</p></li>
+                <li><p>All associated Nodes may be removed from the database</p></li>
+              </ul>
+            </blockquote>
+            <textarea id="nd_devdel-log" class="input-block-level" rows="2" data-form="delete"
+              placeholder="Enter a log message" name="log"></textarea>
+            <label class="checkbox" style="display: block">
+              <input id="nd_devdel-archive" type="checkbox" data-form="delete" name="archive">
+              <h4 class="nd_unbolden">Archive Nodes</h4>
+            </label>
+            <input type="hidden" data-form="delete" value="[% row.ip | html_entity %]" name="ip"/>
+          </div>
+          <div class="modal-footer">
+            <button class="btn btn-success" data-dismiss="modal" aria-hidden="true">Cancel</button>
+            <button class="btn btn-danger nd_adminbutton" name="delete" data-dismiss="modal">Confirm</button>
+          </div>
+        </div>
+      </td>
+    </tr>
+    [% END %]
+  </tbody>
+</table>
+[% END %]
+
+<script>
+$(document).ready(function() {
+  $('#data-table').dataTable({
+[% INCLUDE 'ajax/datatabledefaults.tt' -%]
+  } );
+} );
+</script>