diff --git a/ietf/ipr/tests.py b/ietf/ipr/tests.py
index 922ae272a9..a65b0d6c6c 100644
--- a/ietf/ipr/tests.py
+++ b/ietf/ipr/tests.py
@@ -24,6 +24,7 @@
     RfcFactory,
     NewRevisionDocEventFactory
 )
+from ietf.doc.utils import prettify_std_name
 from ietf.group.factories import RoleFactory
 from ietf.ipr.factories import (
     HolderIprDisclosureFactory,
@@ -192,6 +193,38 @@ def test_search(self):
         r = self.client.get(url + "?submit=rfc&rfc=321")
         self.assertContains(r, ipr.title)
 
+        rfc_new = RfcFactory(rfc_number=322)
+        rfc_new.relateddocument_set.create(relationship_id="obs", target=rfc)
+
+        # find RFC 322 which obsoletes RFC 321 whose draft has IPR
+        r = self.client.get(url + "?submit=rfc&rfc=322")
+        self.assertContains(r, ipr.title)
+        self.assertContains(r, "Total number of IPR disclosures found: <b>1</b>")
+        self.assertContains(r, "Total number of documents searched: <b>3</b>.")
+        self.assertContains(
+            r,
+            f"""Results for <a href="/doc/{rfc_new.name}/">{prettify_std_name(rfc_new.name)}</a>
+                        ("{rfc_new.title}")""",
+        )
+        self.assertContains(
+            r,
+            f"""Results for <a href="/doc/{rfc.name}/">{prettify_std_name(rfc.name)}</a>
+                        ("{rfc.title}"), which
+                            
+                                was obsoleted by
+                                <a href="/doc/{rfc_new.name}/">{prettify_std_name(rfc_new.name)}</a>
+                                ("{rfc_new.title}")""",
+        )
+        self.assertContains(
+            r,
+            f"""Results for <a href="/doc/{draft.name}/">{prettify_std_name(draft.name)}</a>
+                        ("{draft.title}"), which
+                            
+                                became rfc
+                                <a href="/doc/{rfc.name}/">{prettify_std_name(rfc.name)}</a>
+                                ("{rfc.title}")""",
+        )
+
         # find by patent owner
         r = self.client.get(url + "?submit=holder&holder=%s" % ipr.holder_legal_name)
         self.assertContains(r, ipr.title)
diff --git a/ietf/ipr/views.py b/ietf/ipr/views.py
index a061232b8f..45fad9a2cc 100644
--- a/ietf/ipr/views.py
+++ b/ietf/ipr/views.py
@@ -689,11 +689,41 @@ def search(request):
                 if len(start) == 1:
                     first = start[0]
                     doc = first
-                    docs = related_docs(first)
-                    iprs = iprs_from_docs(docs,states=states)
+                    docs = set([first])
+                    docs.update(
+                        related_docs(
+                            first, relationship=("replaces", "obs"), reverse_relationship=()
+                        )
+                    )
+                    docs.update(
+                        set(
+                            [
+                                draft
+                                for drafts in [
+                                    related_docs(
+                                        d, relationship=(), reverse_relationship=("became_rfc",)
+                                    )
+                                    for d in docs
+                                ]
+                                for draft in drafts
+                            ]
+                        )
+                    )
+                    docs.discard(None)
+                    docs = sorted(
+                        docs,
+                        key=lambda d: (
+                            d.rfc_number if d.rfc_number is not None else 0,
+                            d.became_rfc().rfc_number if d.became_rfc() else 0,
+                        ),
+                        reverse=True,
+                    )
+                    iprs = iprs_from_docs(docs, states=states)
                     template = "ipr/search_doc_result.html"
-                    updated_docs = related_docs(first, ('updates',))
-                    related_iprs = list(set(iprs_from_docs(updated_docs, states=states)) - set(iprs))
+                    updated_docs = related_docs(first, ("updates",))
+                    related_iprs = list(
+                        set(iprs_from_docs(updated_docs, states=states)) - set(iprs)
+                    )
                 # multiple matches, select just one
                 elif start:
                     docs = start
diff --git a/ietf/templates/ipr/search_doc_result.html b/ietf/templates/ipr/search_doc_result.html
index dc7d8b95b5..b003a32108 100644
--- a/ietf/templates/ipr/search_doc_result.html
+++ b/ietf/templates/ipr/search_doc_result.html
@@ -54,16 +54,27 @@
             </tr>
         </thead>
 
-        {% for doc in docs %}
+        {% for d in docs %}
             <tbody>
                 <tr>
                     <th scope="col" class="table-info" colspan="3">
-                        Results for {{ doc.name|prettystdname|urlize_ietf_docs }} ("{{ doc.title }}"){% if not forloop.first %}{% if doc.related %}, which was {{ doc.relation|lower }} {{ doc.related.source|prettystdname|urlize_ietf_docs  }} ("{{ doc.related.source.title }}"){% endif %}{% endif %}
+                        Results for {{ d.name|prettystdname|urlize_ietf_docs }}
+                        ("{{ d.title }}"){% if d != doc and d.related %}, which
+                            {% if d == d.related.source %}
+                                {{ d.relation|lower }}
+                                {{ d.related.target|prettystdname|urlize_ietf_docs }}
+                                ("{{ d.related.target.title }}")
+                            {% else %}
+                                was {{ d.relation|lower }}
+                                {{ d.related.source|prettystdname|urlize_ietf_docs }}
+                                ("{{ d.related.source.title }}")
+                            {% endif %}
+                        {% endif %}
                     </th>
                 </tr>
             </tbody>
             <tbody>
-                {% with doc.iprdocrel_set.all as doc_iprs %}
+                {% with d.iprdocrel_set.all as doc_iprs %}
                     {% if doc_iprs %}
                         {% for ipr in doc_iprs %}
                             {% if ipr.disclosure.state_id in states %}
@@ -81,7 +92,7 @@
                             <td></td>
                             <td></td>
                             <td>
-                                No IPR disclosures have been submitted directly on {{ doc.name|prettystdname|urlize_ietf_docs }}{% if iprs %},
+                                No IPR disclosures have been submitted directly on {{ d.name|prettystdname|urlize_ietf_docs }}{% if iprs %},
                                     but there are disclosures on {% if docs|length == 2 %}a related document{% else %}related documents{% endif %}, listed on this page{% endif %}.
                             </td>
                         </tr>