Usoftgaming-operated PH.casino, Gammix-owned Locowin.com, Pro Xenon Mediathek’s Kajot-Casino.com and Westcasino.com from Goldwin all now feature on the blacklist.
First published in February 2012, the blacklist includes websites deemed to be operating in Belgium illegally without the relevant licence.
Operators that continue to run gambling sites without a licence faces fines of between €100 (£85.91/$119.20) and €100,000. Players who gamble on these websites could also face criminal charges and fines ranging from €26 up to €25,000.
In April, the Commission also added Dixcasino.com, Gamdom.com, Stake.com and Fastpay-casino.com to the blacklist. This came after a group of 15 domains were added to the list in March.
William Hill, Bet365, Betfair, Betvictor, Winamax and 1xBet are among the other brands that feature on the blacklist.