diff --git a/public/utils.js b/public/utils.js
index 5355d2f..c05cb41 100644
--- a/public/utils.js
+++ b/public/utils.js
@@ -257,17 +257,33 @@ function formSubmit(e) {
       if (data.get("op") == "block_post") {
         var post = document.getElementById("p"+data.get("postid"))
         var user = post.getElementsByClassName("submitter")[0].href
+        var userinstance = user.split('@').pop()
+        if (userinstance == user) {
+          userinstance = ''
+        }
         var community = post.getElementsByClassName("community")[0].href
+        var postinstance = community.split('@').pop()
+        if (postinstance == community) {
+          postinstance = ''
+        }
         var posts = Array.prototype.slice.call(document.getElementsByClassName("post"))
         for (var i = 0; i < posts.length; i++) {
           var user2 = posts[i].getElementsByClassName("submitter")[0].href
+          var userinstance2 = user2.split('@').pop()
           var community2 = posts[i].getElementsByClassName("community")[0].href
+          var postinstance2 = community2.split('@').pop()
           if (data.get("blockcommunity") != null && community2 == community) {
             posts[i].remove()
           }
           if (data.get("blockuser") != null && user2 == user) {
             posts[i].remove()
           }
+          if (data.get("blockuserinstance") != null && (userinstance == userinstance2 || userinstance == postinstance2)) {
+            posts[i].remove()
+          }
+          if (data.get("blockpostinstance") != null && (postinstance == userinstance2 || postinstance == postinstance2)) {
+            posts[i].remove()
+          }
         }
         targ.remove()
         return
diff --git a/routes.go b/routes.go
index 4ffdf78..a828a72 100644
--- a/routes.go
+++ b/routes.go
@@ -75,6 +75,14 @@ var funcMap = template.FuncMap{
 		}
 		return false
 	},
+	"instance": func(actorID string) string {
+		l, err := url.Parse(actorID)
+		if err != nil {
+			fmt.Println(err)
+			return ""
+		}
+		return l.Host
+	},
 	"domain": func(p Post) string {
 		if p.Post.URL.IsValid() {
 			l, err := url.Parse(p.Post.URL.String())
@@ -1231,6 +1239,20 @@ func UserOp(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
 				Block:    true,
 			})
 		}
+		if r.FormValue("blockpostinstance") != "" && len(state.Posts) > 0 {
+			instanceID, _ := strconv.ParseInt(r.FormValue("postinstanceid"), 10, 64)
+			state.Client.BlockInstance(context.Background(), lemmy.BlockInstance{
+				InstanceID: instanceID,
+				Block:      true,
+			})
+		}
+		if r.FormValue("blockuserinstance") != "" && len(state.Posts) > 0 {
+			instanceID, _ := strconv.ParseInt(r.FormValue("userinstanceid"), 10, 64)
+			state.Client.BlockInstance(context.Background(), lemmy.BlockInstance{
+				InstanceID: instanceID,
+				Block:      true,
+			})
+		}
 	case "read_post":
 		postid, _ := strconv.ParseInt(r.FormValue("postid"), 10, 64)
 		post := lemmy.MarkPostAsRead{
diff --git a/templates/block.html b/templates/block.html
index 311634c..4beaa8c 100644
--- a/templates/block.html
+++ b/templates/block.html
@@ -7,13 +7,27 @@
     <input type="checkbox" id="blockuser" name="blockuser" checked>
     <label for="blockuser">u/{{ fullname (index .Posts 0).Creator }}</label>
   </div>
+  {{ if and (not (index .Posts 0).Creator.Local) (ne (index .Posts 0).Creator.InstanceID .Community.CommunityView.Community.InstanceID) }}
+  <div>
+    <input type="checkbox" id="blockuserinstance" name="blockuserinstance">
+    <label for="blockuserinstance">{{ instance (index .Posts 0).Creator.ActorID }}</label>
+  </div>
+  {{ end }}
   <div>
     <input type="checkbox" id="blockcommunity" name="blockcommunity">
     <label for="blockcommunity">c/{{ fullcname .Community.CommunityView.Community }}</label>
   </div>
+  {{ if not .Community.CommunityView.Community.Local }}
+  <div>
+    <input type="checkbox" id="blockpostinstance" name="blockpostinstance">
+    <label for="blockpostinstance">{{ instance .Community.CommunityView.Community.ActorID }}</label>
+  </div>
+  {{ end }}
   <div>
     <input type="hidden" name="op" value="block_post">
     <input type="hidden" name="postid" value="{{(index .Posts 0).Post.ID}}">
+    <input type="hidden" name="userinstanceid" value="{{(index .Posts 0).Creator.InstanceID}}">
+    <input type="hidden" name="postinstanceid" value="{{.Community.CommunityView.Community.InstanceID}}">
     <input type="submit" value="block" name="submit">
     <input type="submit" value="cancel" name="submit">
   </div>