diff --git a/bisectwindow.cpp b/bisectwindow.cpp
index bbf9324..50c0400 100644
--- a/bisectwindow.cpp
+++ b/bisectwindow.cpp
@@ -54,8 +54,8 @@ void BisectWindow::refreshIDList()
     std::sort(foundID.begin(), foundID.end());
 
     foreach (int id, foundID) {
-        ui->cbIDLower->addItem(Utility::formatNumber(id));
-        ui->cbIDUpper->addItem(Utility::formatNumber(id));
+        ui->cbIDLower->addItem(Utility::formatCANID(id));
+        ui->cbIDUpper->addItem(Utility::formatCANID(id));
     }
 }
 
diff --git a/canframemodel.cpp b/canframemodel.cpp
index 87b5201..b5be4e5 100644
--- a/canframemodel.cpp
+++ b/canframemodel.cpp
@@ -272,7 +272,7 @@ QVariant CANFrameModel::data(const QModelIndex &index, int role) const
         case Column::TimeStamp:
             return Utility::formatTimestamp(thisFrame.timestamp);
         case Column::FrameId:
-            return Utility::formatNumber(thisFrame.ID);
+            return Utility::formatCANID(thisFrame.ID, thisFrame.extended);
         case Column::Extended:
             return QString::number(thisFrame.extended);
         case Column::Direction:
diff --git a/dbc/dbcmaineditor.cpp b/dbc/dbcmaineditor.cpp
index f610f7a..1b041b6 100644
--- a/dbc/dbcmaineditor.cpp
+++ b/dbc/dbcmaineditor.cpp
@@ -276,7 +276,7 @@ void DBCMainEditor::onCellChangedMessage(int row,int col)
 
             item =  ui->MessagesTable->item(row, 0);
             item->setFlags(item->flags() & ~Qt::ItemIsEditable);
-            item->setText(Utility::formatNumber(msgID));
+            item->setText(Utility::formatCANID(msgID));
 
             for(int i=1 ; i < ui->MessagesTable->columnCount(); i++)
             {
@@ -486,7 +486,7 @@ void DBCMainEditor::refreshMessagesTable(const DBC_NODE *node)
             if (msg->sender == node)
             {
                 //many of these are simplistic first versions just to test functionality.
-                QTableWidgetItem *msgID = new QTableWidgetItem(Utility::formatNumber(msg->ID));
+                QTableWidgetItem *msgID = new QTableWidgetItem(Utility::formatCANID(msg->ID));
                 QTableWidgetItem *msgName = new QTableWidgetItem(msg->name);
                 QTableWidgetItem *msgLen = new QTableWidgetItem(QString::number(msg->len));
                 QTableWidgetItem *msgSignals = new QTableWidgetItem(QString::number(msg->sigHandler->getCount()));
diff --git a/frameplaybackwindow.cpp b/frameplaybackwindow.cpp
index d8460cb..a44d661 100644
--- a/frameplaybackwindow.cpp
+++ b/frameplaybackwindow.cpp
@@ -248,7 +248,7 @@ void FramePlaybackWindow::refreshIDList()
     QHash<int, bool>::Iterator filterIter;
     for (filterIter = currentSeqItem->idFilters.begin(); filterIter != currentSeqItem->idFilters.end(); ++filterIter)
     {
-        QListWidgetItem* listItem = new QListWidgetItem(Utility::formatNumber(filterIter.key()), ui->listID);
+        QListWidgetItem* listItem = new QListWidgetItem(Utility::formatCANID(filterIter.key()), ui->listID);
         listItem->setFlags(listItem->flags() | Qt::ItemIsUserCheckable); // set checkable flag
         if (filterIter.value()) listItem->setCheckState(Qt::Checked);
         else listItem->setCheckState(Qt::Unchecked);
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 2f4e1ea..c12b46d 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -353,7 +353,7 @@ void MainWindow::updateFilterList()
     for (filterIter = filters->begin(); filterIter != filters->end(); ++filterIter)
     {
         QListWidgetItem *thisItem = new QListWidgetItem();
-        thisItem->setText(Utility::formatNumber(filterIter.key()));
+        thisItem->setText(Utility::formatCANID(filterIter.key()));
         thisItem->setFlags(thisItem->flags() | Qt::ItemIsUserCheckable);
         if (filterIter.value()) thisItem->setCheckState(Qt::Checked);
             else thisItem->setCheckState(Qt::Unchecked);
@@ -632,7 +632,7 @@ Data Bytes: 88 10 00 13 BB 00 06 00
         CANFrame thisFrame = frames->at(c);
         QString builderString;
         builderString += tr("Time: ") + QString::number((thisFrame.timestamp / 1000000.0), 'f', 6);
-        builderString += tr("    ID: ") + Utility::formatNumber(thisFrame.ID);
+        builderString += tr("    ID: ") + Utility::formatCANID(thisFrame.ID, thisFrame.extended);
         if (thisFrame.extended) builderString += tr(" Ext ");
         else builderString += tr(" Std ");
         builderString += tr("Bus: ") + QString::number(thisFrame.bus);
diff --git a/re/discretestatewindow.cpp b/re/discretestatewindow.cpp
index d9d1edb..82a03c9 100644
--- a/re/discretestatewindow.cpp
+++ b/re/discretestatewindow.cpp
@@ -121,7 +121,7 @@ void DiscreteStateWindow::updatedFrames(int numFrames)
             if (!idFilters.contains(thisFrame.ID))
             {
                 idFilters.insert(thisFrame.ID, true);
-                QListWidgetItem* listItem = new QListWidgetItem(Utility::formatNumber(thisFrame.ID), ui->listID);
+                QListWidgetItem* listItem = new QListWidgetItem(Utility::formatCANID(thisFrame.ID, thisFrame.extended), ui->listID);
                 listItem->setFlags(listItem->flags() | Qt::ItemIsUserCheckable); // set checkable flag
                 listItem->setCheckState(Qt::Checked); //default all filters to be set active
             }
@@ -141,11 +141,12 @@ void DiscreteStateWindow::refreshFilterList()
 
     for (int i = 0; i < modelFrames->length(); i++)
     {
-        id = modelFrames->at(i).ID;
+        CANFrame thisFrame = modelFrames->at(i);
+        id = thisFrame.ID;
         if (!idFilters.contains(id))
         {
             idFilters.insert(id, true);
-            QListWidgetItem* listItem = new QListWidgetItem(Utility::formatNumber(id), ui->listID);
+            QListWidgetItem* listItem = new QListWidgetItem(Utility::formatCANID(id, thisFrame.extended), ui->listID);
             listItem->setFlags(listItem->flags() | Qt::ItemIsUserCheckable); // set checkable flag
             listItem->setCheckState(Qt::Checked); //default all filters to be set active
         }
diff --git a/re/flowviewwindow.cpp b/re/flowviewwindow.cpp
index d359119..e3514b1 100644
--- a/re/flowviewwindow.cpp
+++ b/re/flowviewwindow.cpp
@@ -397,7 +397,7 @@ void FlowViewWindow::updatedFrames(int numFrames)
             if (!foundID.contains(thisFrame.ID))
             {
                 foundID.append(thisFrame.ID);
-                /*QListWidgetItem* item =*/ new QListWidgetItem(Utility::formatNumber(thisFrame.ID), ui->listFrameID);
+                /*QListWidgetItem* item =*/ new QListWidgetItem(Utility::formatCANID(thisFrame.ID, thisFrame.extended), ui->listFrameID);
             }
 
             if (thisFrame.ID == refID)
@@ -506,11 +506,12 @@ void FlowViewWindow::refreshIDList()
     int id;
     for (int i = 0; i < modelFrames->count(); i++)
     {
-        id = modelFrames->at(i).ID;
+        CANFrame thisFrame = modelFrames->at(i);
+        id = thisFrame.ID;
         if (!foundID.contains(id))
         {
             foundID.append(id);
-            /*QListWidgetItem* item = */ new QListWidgetItem(Utility::formatNumber(id), ui->listFrameID);
+            /*QListWidgetItem* item = */ new QListWidgetItem(Utility::formatCANID(id, thisFrame.extended), ui->listFrameID);
         }
     }
     //default is to sort in ascending order
diff --git a/re/frameinfowindow.cpp b/re/frameinfowindow.cpp
index b803997..53fdae7 100644
--- a/re/frameinfowindow.cpp
+++ b/re/frameinfowindow.cpp
@@ -124,11 +124,12 @@ void FrameInfoWindow::updatedFrames(int numFrames)
         bool thisID = false;
         for (int x = modelFrames->count() - numFrames; x < modelFrames->count(); x++)
         {
-            unsigned int id = modelFrames->at(x).ID;
+            CANFrame thisFrame = modelFrames->at(x);
+            unsigned int id = thisFrame.ID;
             if (!foundID.contains(id))
             {
                 foundID.append(id);
-                ui->listFrameID->addItem(Utility::formatNumber(id));
+                ui->listFrameID->addItem(Utility::formatCANID(id, thisFrame.extended));
             }
 
             if (currID == modelFrames->at(x).ID)
@@ -394,11 +395,12 @@ void FrameInfoWindow::refreshIDList()
     int id;
     for (int i = 0; i < modelFrames->count(); i++)
     {
-        id = (int)modelFrames->at(i).ID;
+        CANFrame thisFrame = modelFrames->at(i);
+        id = (int)thisFrame.ID;
         if (!foundID.contains(id))
         {
             foundID.append(id);
-            ui->listFrameID->addItem(Utility::formatNumber(id));
+            ui->listFrameID->addItem(Utility::formatCANID(id, thisFrame.extended));
         }
     }
     //default is to sort in ascending order
diff --git a/re/fuzzingwindow.cpp b/re/fuzzingwindow.cpp
index d2b62a3..6d96e68 100644
--- a/re/fuzzingwindow.cpp
+++ b/re/fuzzingwindow.cpp
@@ -74,7 +74,7 @@ void FuzzingWindow::updatedFrames(int numFrames)
                 foundIDs.append(id);
                 selectedIDs.append(id);
                 QListWidgetItem *thisItem = new QListWidgetItem();
-                thisItem->setText(Utility::formatNumber(id));
+                thisItem->setText(Utility::formatCANID(id, modelFrames->at(i).extended));
                 thisItem->setFlags(thisItem->flags() | Qt::ItemIsUserCheckable);
                 thisItem->setCheckState(Qt::Checked);
                 ui->listID->addItem(thisItem);
@@ -346,14 +346,15 @@ void FuzzingWindow::refreshIDList()
 
     int id;
     for (int i = 0; i < modelFrames->count(); i++)
-    {
-        id = modelFrames->at(i).ID;
+    {        
+        CANFrame thisFrame = modelFrames->at(i);
+        id = thisFrame.ID;
         if (!foundIDs.contains(id))
         {
             foundIDs.append(id);
             selectedIDs.append(id);
             QListWidgetItem *thisItem = new QListWidgetItem();
-            thisItem->setText(Utility::formatNumber(id));
+            thisItem->setText(Utility::formatCANID(id, thisFrame.extended));
             thisItem->setFlags(thisItem->flags() | Qt::ItemIsUserCheckable);
             thisItem->setCheckState(Qt::Checked);
             ui->listID->addItem(thisItem);
diff --git a/re/isotp_interpreterwindow.cpp b/re/isotp_interpreterwindow.cpp
index 866b5d1..0393ce6 100644
--- a/re/isotp_interpreterwindow.cpp
+++ b/re/isotp_interpreterwindow.cpp
@@ -231,7 +231,7 @@ void ISOTP_InterpreterWindow::newISOMessage(ISOTP_MESSAGE msg)
     {
         idFilters.insert(msg.ID, true);
 
-        QListWidgetItem* listItem = new QListWidgetItem(Utility::formatNumber(msg.ID), ui->listFilter);
+        QListWidgetItem* listItem = new QListWidgetItem(Utility::formatCANID(msg.ID, msg.extended), ui->listFilter);
         listItem->setFlags(listItem->flags() | Qt::ItemIsUserCheckable); // set checkable flag
         listItem->setCheckState(Qt::Checked);
     }
diff --git a/re/newgraphdialog.cpp b/re/newgraphdialog.cpp
index 9af7095..6807152 100644
--- a/re/newgraphdialog.cpp
+++ b/re/newgraphdialog.cpp
@@ -85,7 +85,7 @@ void NewGraphDialog::setParams(GraphParams &params)
     startBit = params.startBit;
     dataLen = params.numBits;
     ui->txtDataLen->setText(QString::number(dataLen));
-    ui->txtID->setText(Utility::formatNumber(params.ID));
+    ui->txtID->setText(Utility::formatCANID(params.ID));
     ui->txtName->setText(params.graphName);
     QPalette p = ui->colorSwatch->palette();
     p.setColor(QPalette::Button, params.color);
@@ -211,7 +211,7 @@ void NewGraphDialog::copySignalToParamsUI()
     startBit = sig->startBit;
     ui->txtBias->setText(QString::number(sig->bias));
     ui->txtDataLen->setText(QString::number(sig->signalSize));
-    ui->txtID->setText(Utility::formatNumber(msg->ID));
+    ui->txtID->setText(Utility::formatCANID(msg->ID));
     ui->txtMask->setText("0xFFFFFFFF");
     ui->txtName->setText(sig->name);
     ui->txtScale->setText(QString::number(sig->factor));
diff --git a/re/rangestatewindow.cpp b/re/rangestatewindow.cpp
index 76d03e3..16d1b4b 100644
--- a/re/rangestatewindow.cpp
+++ b/re/rangestatewindow.cpp
@@ -138,7 +138,7 @@ void RangeStateWindow::updatedFrames(int numFrames)
             if (!idFilters.contains(thisFrame.ID))
             {
                 idFilters.insert(thisFrame.ID, true);
-                QListWidgetItem* listItem = new QListWidgetItem(Utility::formatNumber(thisFrame.ID), ui->listFilter);
+                QListWidgetItem* listItem = new QListWidgetItem(Utility::formatCANID(thisFrame.ID, thisFrame.extended), ui->listFilter);
                 listItem->setFlags(listItem->flags() | Qt::ItemIsUserCheckable); // set checkable flag
                 listItem->setCheckState(Qt::Checked); //default all filters to be set active
             }
@@ -159,7 +159,9 @@ void RangeStateWindow::refreshFilterList()
         if (!idFilters.contains(id))
         {
             idFilters.insert(id, true);
-            QListWidgetItem* listItem = new QListWidgetItem(Utility::formatNumber(id), ui->listFilter);
+            QListWidgetItem* listItem;
+            if (id < 0x800) listItem = new QListWidgetItem(Utility::formatCANID(id, false), ui->listFilter);
+                else listItem = new QListWidgetItem(Utility::formatCANID(id, true), ui->listFilter);
             listItem->setFlags(listItem->flags() | Qt::ItemIsUserCheckable); // set checkable flag
             listItem->setCheckState(Qt::Checked); //default all filters to be set active
         }
diff --git a/utility.h b/utility.h
index 552e6eb..09ec074 100644
--- a/utility.h
+++ b/utility.h
@@ -96,6 +96,27 @@ public:
         else return formatHexNum(value);
     }
 
+    static QString formatCANID(uint64_t id, bool extended)
+    {
+        if (decimalMode) return QString::number(id, 10);
+
+        if (extended)
+        {
+            return "0x" + QString::number(id, 16).toUpper().rightJustified(8,'0');
+        }
+        else
+        {
+            id = id & 0x7FF;
+            return "0x" + QString::number(id, 16).toUpper().rightJustified(3,'0');
+        }
+    }
+
+    static QString formatCANID(uint64_t id)
+    {
+        if (id < 0x800) return formatCANID(id, false);
+        return formatCANID(id, true);
+    }
+
     static QString formatByteAsBinary(uint8_t value)
     {
         QString output;