diff --git a/frontend/src/components/CardActionModal.js b/frontend/src/components/CardActionModal.js
index 73b1a93..bc7f052 100644
--- a/frontend/src/components/CardActionModal.js
+++ b/frontend/src/components/CardActionModal.js
@@ -6,7 +6,7 @@
  */
 
 import React, { useState, useEffect } from 'react';
-import { X, Loader, AlertCircle, CheckCircle, ArrowRightLeft, XCircle } from 'lucide-react'; // ⚠️ CONVENTION: Removed unused `Shield` import to satisfy no-unused-vars lint rule
+import { X, Loader, AlertCircle, CheckCircle, ArrowRightLeft, XCircle, ExternalLink } from 'lucide-react';
 
 const API_BASE = process.env.REACT_APP_API_BASE || 'http://localhost:3001/api';
 
@@ -148,8 +148,36 @@ export default function CardActionModal({ isOpen, onClose, item, initialAction,
           <div>
             <h3 style={{ margin: 0, color: '#F8FAFC', fontSize: '0.95rem' }}>CARD Asset Action</h3>
             {ownerData && (
-              <div style={{ fontSize: '0.7rem', color: '#7C3AED', fontFamily: 'monospace', marginTop: '0.2rem' }}>
-                {ownerData.asset_id}
+              <div style={{ display: 'flex', alignItems: 'center', gap: '0.5rem', marginTop: '0.2rem' }}>
+                <span style={{ fontSize: '0.7rem', color: '#7C3AED', fontFamily: 'monospace' }}>
+                  {ownerData.asset_id}
+                </span>
+                {item?.host_id && (
+                  <button
+                    onClick={() => {
+                      navigator.clipboard.writeText(String(item.host_id));
+                      window.open('https://card.charter.com/ipn-search', '_blank');
+                    }}
+                    title={`Copy Host ID ${item.host_id} and open CARD`}
+                    style={{
+                      display: 'inline-flex', alignItems: 'center', gap: '0.25rem',
+                      padding: '0.15rem 0.45rem',
+                      background: 'rgba(14, 165, 233, 0.12)',
+                      border: '1px solid rgba(14, 165, 233, 0.4)',
+                      borderRadius: '0.25rem',
+                      color: '#7DD3FC',
+                      fontSize: '0.58rem', fontWeight: '600', fontFamily: 'monospace',
+                      cursor: 'pointer',
+                      textTransform: 'uppercase', letterSpacing: '0.04em',
+                      transition: 'all 0.12s',
+                    }}
+                    onMouseEnter={(e) => { e.currentTarget.style.background = 'rgba(14, 165, 233, 0.25)'; }}
+                    onMouseLeave={(e) => { e.currentTarget.style.background = 'rgba(14, 165, 233, 0.12)'; }}
+                  >
+                    <ExternalLink style={{ width: 9, height: 9 }} />
+                    CARD
+                  </button>
+                )}
               </div>
             )}
           </div>
diff --git a/frontend/src/components/CardOwnerTooltip.js b/frontend/src/components/CardOwnerTooltip.js
index 1289f72..ac7c445 100644
--- a/frontend/src/components/CardOwnerTooltip.js
+++ b/frontend/src/components/CardOwnerTooltip.js
@@ -9,10 +9,9 @@
 
 import React, { useState, useEffect, useRef, useLayoutEffect, useCallback } from 'react';
 import ReactDOM from 'react-dom';
-import { Loader, AlertCircle, ExternalLink } from 'lucide-react';
+import { Loader, AlertCircle, ExternalLink, Copy } from 'lucide-react';
 
-// ⚠️ CONVENTION: Use relative API path from REACT_APP_API_BASE only (no absolute URL fallback).
-// Other components use: const API_BASE = process.env.REACT_APP_API_BASE || '/api';
+// ⚠️ CONVENTION: Use relative API path fallback, not absolute URL. Should be: process.env.REACT_APP_API_BASE || '/api'
 const API_BASE = process.env.REACT_APP_API_BASE || 'http://localhost:3001/api';
 
 const TOOLTIP_GAP = 8;
@@ -136,6 +135,7 @@ export default function CardOwnerTooltip({ ip, hostId, anchorRect, cache, cardCo
             error={error}
             anchorRect={anchorRect}
             ip={ip}
+            hostId={hostId}
             onAction={onAction}
             onMouseEnter={onMouseEnter}
             onMouseLeave={onMouseLeave}
@@ -147,7 +147,7 @@ export default function CardOwnerTooltip({ ip, hostId, anchorRect, cache, cardCo
 // ---------------------------------------------------------------------------
 // TooltipBody — inner component for measurement + rendering
 // ---------------------------------------------------------------------------
-function TooltipBody({ data, loading, error, anchorRect, ip, onAction, onMouseEnter, onMouseLeave }) {
+function TooltipBody({ data, loading, error, anchorRect, ip, hostId, onAction, onMouseEnter, onMouseLeave }) {
     const tooltipRef = useRef(null);
     const [pos, setPos] = useState({ top: 0, left: 0, placeAbove: true });
 
@@ -304,7 +304,7 @@ function TooltipBody({ data, loading, error, anchorRect, ip, onAction, onMouseEn
 
                     {/* Actions button */}
                     {onAction && (
-                        <div style={{ marginTop: '0.4rem', paddingTop: '0.4rem', borderTop: '1px solid rgba(124, 58, 237, 0.2)' }}>
+                        <div style={{ marginTop: '0.4rem', paddingTop: '0.4rem', borderTop: '1px solid rgba(124, 58, 237, 0.2)', display: 'flex', gap: '0.4rem', flexWrap: 'wrap' }}>
                             <button
                                 onClick={handleAction}
                                 style={{
@@ -325,6 +325,32 @@ function TooltipBody({ data, loading, error, anchorRect, ip, onAction, onMouseEn
                                 <ExternalLink style={{ width: 11, height: 11 }} />
                                 Actions
                             </button>
+                            {hostId && (
+                                <button
+                                    onClick={() => {
+                                        navigator.clipboard.writeText(String(hostId));
+                                        window.open('https://card.charter.com/ipn-search', '_blank');
+                                    }}
+                                    title={`Copy Host ID ${hostId} and open CARD`}
+                                    style={{
+                                        display: 'inline-flex', alignItems: 'center', gap: '0.35rem',
+                                        padding: '0.3rem 0.65rem',
+                                        background: 'rgba(14, 165, 233, 0.12)',
+                                        border: '1px solid rgba(14, 165, 233, 0.4)',
+                                        borderRadius: '0.3rem',
+                                        color: '#7DD3FC',
+                                        fontSize: '0.65rem', fontWeight: '600', fontFamily: 'monospace',
+                                        cursor: 'pointer',
+                                        textTransform: 'uppercase', letterSpacing: '0.04em',
+                                        transition: 'all 0.12s',
+                                    }}
+                                    onMouseEnter={(e) => { e.currentTarget.style.background = 'rgba(14, 165, 233, 0.25)'; e.currentTarget.style.borderColor = 'rgba(14, 165, 233, 0.6)'; }}
+                                    onMouseLeave={(e) => { e.currentTarget.style.background = 'rgba(14, 165, 233, 0.12)'; e.currentTarget.style.borderColor = 'rgba(14, 165, 233, 0.4)'; }}
+                                >
+                                    <Copy style={{ width: 11, height: 11 }} />
+                                    View in CARD
+                                </button>
+                            )}
                         </div>
                     )}
                 </div>