The National Crime Agency (NCA) today said that the search was carried out as authorities in five countries targeted six members of a gang behind the webstresser.org website.
The website, which was used in attacks on some of the UK's biggest banks, has also been shut down.
It is believed that a person linked to the Bradford address had used the site to target seven banks last year.
"Individuals with little or no technical knowledge could rent the webstresser service to launch crippling DDOS attacks across the world.
"As part of the operational activity, an address was identified and searched in Bradford and a number of items seized.
"NCA officers believe an individual linked to the address used the webstresser service to target seven of the UK's biggest banks in attacks in November 2017.
"They were forced to reduce operations or shut down entire systems, incurring costs in the hundreds of thousands to get services back up and running."