The addresses point to the computers that distributed the virus that triggered so-called denial of service attacks in which floods of computers try to connect to a single site at the same time, overwhelming the server.
They were in Austria, Georgia, Germany, South Korea and the U.S., a commission official said. He spoke on condition of anonymity because he is not authorized to speak to the media on the record.
Speculation over who was responsible for the attacks that targeted high-profile Web sites, including those of the White House and South Korea's presidential Blue House, has centered on North Korea.
And though such finger-pointing has been trickling out since the attacks began, the identity of the IP addresses themselves provides little in the way of clarity.
That's because it is likely the hackers, whoever they are, used the addresses to disguise themselves — for instance, by accessing the computers from a remote location. IP addresses can also be faked or masked, hiding their true location.
South Korean media reported in May that North Korea was running an Internet warfare unit that tries to hack into American and South Korean military networks to gather confidential information and disrupt service. The Chosun Ilbo newspaper reported Friday that the North has between 500-1,000 hacking specialists.
The fact that some of the attacked sites — such as the ruling party and the office of President Lee Myung-bak — have links to the South Korean government's hard-line policies toward the North was cited as further reason why Pyongyang might attack them.
The North has drawn repeated international rebuke in recent months for threats and actions seen as provocative by the international community. Those include a nuclear test in May and short-range ballistic missile launches on July 4.
North Korea has not responded to the allegations of its involvement in the Web site outages.
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