Bao Casino, Pokie Place, Reels of Joy and Ozwin Casino were all investigated by ACMA after it received numerous complaints about the four websites.
ACMA found each site to be in breach of the Interactive Gambling Act 2001 and requested that ISPs block access in the country.
“Website blocking provides a valuable opportunity to alert the public to illegal gambling services through the messaging that appears when there is an attempt to access the site,” ACMA said.
“ACMA is reminding consumers that even if a service looks legitimate, its unlikely to have important customer protections. This means Australians who use illegal gambling services risk losing their money.”
Since the ACMA made its first blocking request back in November 2019, 263 illegal gambling websites have been blocked, while over 130 sites have pulled out of the Australian market since the authority began enforcing new illegal offshore gambling rules in 2017.
In March, ACMA also requested the blocking of 10 other gambling websites, including Play Croco, Aussie Play, Golden Reels and All Spins Win. This followed a request to block another 18 sites in February.