617K accounts from Comcast (comcast.net) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswordsPhysical addresses
In November 2015, the US internet and cable TV provider Comcast suffered a data breach that exposed 590k customer email addresses and plain text passwords. A further 27k accounts appeared with home addresses with the entire data set being sold on underground forums.
Source: Have I Been Pwned (CC BY 4.0)