(CNN) -- An Iranian court has sentenced the so-called "blogfather" of Iran to 19½ years in prison, the semi-official Mashregh news website said Tuesday.

Hossein Derakhshan was "convicted of cooperating with enemy states, making propaganda against the Islamic system of government, promoting small anti-revolutionary groups, managing obscene web sites and insulting Islamic sanctities," Mashregh reported.

The 35-year-old Canadian-Iranian blogger and activist was also banned from journalistic endeavors and from joining any political parties for five years.

Derakhshan was arrested on November 1, 2008, and is being held at the Evin Prison in Tehran, reported the International Campaign for Human Rights in Iran.

Hamed Derakhshan, Hossein Derakhshan's brother, was shocked when he discovered the news of Hossein Derakhshan's sentence from an online news report.

"It targets exactly freedom of speech and expression. Maybe they are trying to make an example of him by giving him a heavy sentence," Hamed Derakhshan told CNN.

The Derakhshan family will appeal Hossein Derakhshan's sentence.

Hadi Ghaemi, executive director of the International Campaign for Human Rights in Iran, condemned the sentence.

"This is the longest sentence issued against a blogger in Iran, and it is solely because of his opinions and blogging. The sentence is meant to send a chilling message to the Iranian youth to stay away from the internet in practicing their freedom of expression," Ghaemi said.

Derakhshan's blog, titled Editor Myself on i.hoder.com, gained worldwide notoriety. He got particular attention for helping other Iranians start their own blogs with step-by-step start-up guides published in Persian.

Derakhshan also blogged on many political issues including freedom of expression, the Islamic Republic of Iran and Israeli relations in the Middle East.

In 2006 Derakhshan shocked his followers when he visited Israel on his Canadian passport.

"He was reporting his trip minute by minute on his blog ... in both English and Persian. It was the first time that an Iranian was reporting the real life in Israel," Hamed Derakhshan said.

Shortly before his imprisonment Hossein Derakhshan began writing in support of Iranian President Mahmoud Ahmadinejad.

"He felt Ahmadinejad was doing good for Iran. At that point many Iranian bloggers didn't like his ideas. He believed in the system. He did not believe it was perfect, but he thought he could work with the system and make it better," Hamed Derakhshan said.

CNN attempts to contact Iranian authorities for comment were unsuccessful.