diff --git a/cmd/lookup.go b/cmd/lookup.go
index 7735f39..3182d07 100644
--- a/cmd/lookup.go
+++ b/cmd/lookup.go
@@ -73,6 +73,30 @@ func lookupAction(out io.Writer, ouiCsvFile io.Reader, s string) error {
 		// Lookup the vendor in the OUI database
 		vendor := db.FindOuiByAssignment(assignment)
 
+		// Check if the --include flag is set
+		include := viper.GetString("lookup.include")
+		if include != "" && vendor != nil {
+			// If the --include flag is set, check if the vendor name
+			// contains the specified string (case insensitive)
+			if !vendor.Contains(include) {
+				// If the vendor name does not contain the specified string,
+				// skip to the next MAC address
+				continue
+			}
+		}
+
+		// Check if the --exclude flag is set
+		exclude := viper.GetString("lookup.exclude")
+		if exclude != "" && vendor != nil {
+			// If the --exclude flag is set, check if the vendor name
+			// contains the specified string (case insensitive)
+			if vendor.Contains(exclude) {
+				// If the vendor name contains the specified string,
+				// skip to the next MAC address
+				continue
+			}
+		}
+
 		if vendor != nil {
 			// Write in CSV format if the --csv flag is set
 			if viper.GetBool("lookup.csv") {
@@ -252,4 +276,12 @@ func init() {
 	// Set to the value of the --csv flag if set
 	lookupCmd.PersistentFlags().BoolP("csv", "c", false, "write output in CSV format")
 	viper.BindPFlag("lookup.csv", lookupCmd.PersistentFlags().Lookup("csv"))
+
+	// Set to the value of the --include flag if set
+	lookupCmd.Flags().StringP("include", "I", "", "output only results that include this string (case insensitive)")
+	viper.BindPFlag("lookup.include", lookupCmd.Flags().Lookup("include"))
+
+	// Set to the value of the --exclude flag if set
+	lookupCmd.Flags().StringP("exclude", "E", "", "filter out results that contain this string (case insensitive)")
+	viper.BindPFlag("lookup.exclude", lookupCmd.Flags().Lookup("exclude"))
 }
diff --git a/oui/oui.go b/oui/oui.go
index af6ad96..572fa6c 100644
--- a/oui/oui.go
+++ b/oui/oui.go
@@ -51,6 +51,18 @@ type Oui struct {
 	Address      string // The organization street address
 }
 
+// Contains returns true if the OUI entry contains the specified string
+// in any of the OUI fields. The search is case-insensitive.
+func (o *Oui) Contains(s string) bool {
+	// Search is case-insensitive so convert the search string to lowercase
+	s = strings.ToLower(s)
+
+	// Check if the search string is contained in any of the OUI fields
+	return strings.Contains(strings.ToLower(o.Assignment), s) ||
+		strings.Contains(strings.ToLower(o.Organization), s) ||
+		strings.Contains(strings.ToLower(o.Address), s)
+}
+
 // The OUI database
 type OuiDb struct {
 	// The OUI database
diff --git a/oui/oui_test.go b/oui/oui_test.go
index e89b213..e87c338 100644
--- a/oui/oui_test.go
+++ b/oui/oui_test.go
@@ -261,3 +261,66 @@ MA-L,222222,Texas Instruments,12500 TI Blvd Dallas TX US 75243`
 		}
 	}
 }
+
+// TestOuiContains tests the Contains function of the Oui type.
+func TestOuiContains(t *testing.T) {
+	// Create a test CSV database
+	entry := oui.Oui{
+		Assignment:   "1A2B3C",
+		Organization: "Banana, Inc.",
+		Address:      "1 Infinite Fruity Loop CA US 12014",
+	}
+
+	// Setup test cases
+	testCases := []struct {
+		name     string
+		input    string
+		expected bool
+	}{
+		{
+			name:  "FullAssignment",
+			input: "1A2B3C", expected: true,
+		},
+		{
+			name:  "PartialAssignment",
+			input: "1A2B3", expected: true,
+		},
+		{
+			name:  "PartialAssignmentLowercase",
+			input: "1a2b3", expected: true,
+		},
+		{
+			name:  "FullOrganization",
+			input: "Banana, Inc.", expected: true,
+		},
+		{
+			name:  "PartialOrganizationLowercase",
+			input: "banana", expected: true,
+		},
+		{
+			name:  "FullAddress",
+			input: "1 Infinite Fruity Loop CA US 12014", expected: true,
+		},
+		{
+			name:  "PartialAddressUppercase",
+			input: "LOOP", expected: true,
+		},
+		{
+			name:  "PartialAddressLowercase",
+			input: "fruit", expected: true,
+		},
+		{
+			name:  "NotFound",
+			input: "111222", expected: false},
+	}
+
+	// Loop through the test cases
+	for _, testCase := range testCases {
+		t.Run(testCase.name, func(t *testing.T) {
+			// Verify that the database was loaded correctly
+			if entry.Contains(testCase.input) != testCase.expected {
+				t.Errorf("expected %v, got %v", testCase.expected, entry.Contains(testCase.input))
+			}
+		})
+	}
+}