Concerns had been raised about the unregulated nature of online advertising and how people can be targeted in the context of the upcoming vote.
The ban went into effect on Thursday morning.
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Meanwhile, Facebook said Tuesday it will block foreign adverts aimed at the Irish referendum, "as part of our efforts to help protect the integrity of elections and referendums from undue influence".
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Independent News & Media, Ireland's largest digital media platform, says that it will allow digital ads from both campaigns provided that they are "factual" and are "not offensive".
The groups also claimed that at least half of its posters on the streets had been taken down in recent weeks, resulting in a heavy financial loss to the No side. Depending on what you search online, advertisers can select terms that make their ads appear when you search that term.
The electoral law of Ireland prohibits foreign organizations to Finance the electoral campaigns.
The news comes amid increasing focus on how online ads were used in campaigns like the Brexit referendum or the 2016 U.S. election.
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