Assange, 47, is accused by US authorities of 18 charges including conspiring to hack US government computers and violating an espionage law.
He is currently in a London prison after being jailed for 50 weeks for skipping bail after fleeing to the Ecuadorean embassy seven years ago to avoid extradition to Sweden for questioning in a sexual assault investigation, Reuters reported.
Assange, dressed in a grey T-shirt and wearing black-framed glasses, appeared by videolink for the short hearing at Westminster Magistrates’ Court.
As Ben Brandon, the lawyer representing the United States, ran through a summary of the accusations against him including that he had cracked a US defense network password, Assange said: “I didn’t break any password whatsoever”.