Since bedbugs can happen in almost any place at any time and for many of these websites reports are not confirmed or verified, you can't always be certain that reports about bedbugs are accurate.
That being said, here are some websites that allow you to check for bedbug reports.
A website called The World BedBug Registry Project was created to let people know where bedbugs have supposedly been sighted at hotels
The World BedBug Registry Project says it allows users to search hotels for any reported bedbug issues, dating back to 2012. The project was launched by bedbugs.net in 2012, and it gathers its information based on user reports of bedbug sightings.
According to the website, the Worldwide Bedbug Registry aims to be "the go-to bedbug reporting source for the public."
You'll want to keep in mind that these reports are submitted by users, so there's no way to confirm their accuracy and while the site says they cannot control what is posted, they do allow hotel management to dispute claims in the comments.
If you're in or traveling to the US or Canada, BedBug Reports allows you to search for user reports of bed bugs in buildings, rental homes, and hotels
The website BedBug Reports gathers reports of bedbugs from users and categorizes them by state and city. The website gathers user reports that can be anonymous and are not verified, so use your best judgment when reviewing them. That being said, BedBug Reports says they allow hotel and building owners to dispute false reports and have them removed if they can provide "a copy from an extermination report advising that [their] hotel/apartment is clear of bed bugs."