private static final ImmutableSet<String> SCOPE_IDS =
      ImmutableSet.of("eno1", "en1", "eth0", "X", "1", "2", "14", "20");

  public void testIPv4AddressWithScopeId() {
    ImmutableSet<String> ipStrings = ImmutableSet.of("1.2.3.4", "192.168.0.1");
    for (String ipString : ipStrings) {
      for (String scopeId : SCOPE_IDS) {
        String withScopeId = ipString + "%" + scopeId;
        assertFalse(

  private static final ImmutableSet<String> SCOPE_IDS =
      ImmutableSet.of("eno1", "en1", "eth0", "X", "1", "2", "14", "20");

  public void testIPv4AddressWithScopeId() {
    ImmutableSet<String> ipStrings = ImmutableSet.of("1.2.3.4", "192.168.0.1");
    for (String ipString : ipStrings) {
      for (String scopeId : SCOPE_IDS) {
        String withScopeId = ipString + "%" + scopeId;
        assertFalse(

        ipString = ipString.substring(0, percentIndex);
      }
      return textToNumericFormatV6(ipString);
    } else if (hasDot) {
      if (percentIndex != -1) {
        return null; // Scope IDs are not supported for IPV4
      }
      return textToNumericFormatV4(ipString);
    }
    return null;
  }

  @CheckForNull
  private static byte[] textToNumericFormatV4(String ipString) {