Derryn Hinch has fulfilled his promise to "name names" in the Senate, using parliamentary privilege to identify up to five men he claims are paedophiles.

The newly elected Victorian senator used his maiden speech on Monday to wield the legal immunity to name five names, which Fairfax Media has at this stage decided not to publish.

Senator Hinch, who was placed under house arrest in 2011 after he named sex offenders and was jailed in 2014 for contempt of court for publishing the criminal record of Melbourne woman Jill Meagher's killer Adrian Bayley, made no apologies for using the protection.

"But it will be a court of last resort, I will not be a cowboy – but if it is necessary to protect the child's wellbeing, then damned right I will name the human vermin," he said during his 45-minute address - 25 minutes longer than tradition usually allows.