ANSWER:
The hadeeth about the emergence of around 30 imposters is authentic. In other narrations, 4 of them are women.
This is referring to those who claim to be prophets and also have fame and power to fight with and not only calming prophethood as those were in the thousands.
Among them were Mosailimah Al Kath’ab (the lair), Abu Al Aswad Al A’ansi and of recent times, Mirza Ahmed who is the head of the Qadyani cult who claimed to be a prophet. All muslims agree that this qadyani or Ahmadiyah cult are apostate and are worse than the Jews and Christians whom we can marry from and eat their slaughtering while the Qadyani cult are prohibited for Muslims to interact with through marriage or eating their slaughtered animals!
All of these lairs will be concluded by the emergence of the Dajjal who is known as the anti christ who would fill the earth with corruption and be killed by Jesus, peace be upon him at the end of times.