AT&T Inc. threw its name onto the growing pile of lawsuits seeking to overturn the government's recent net neutrality order.

The move Tuesday was a surprise, because companies had generally said they would let their industry groups handle the legal challenges. The suit pits AT&T against the Federal Communications Commission, which put forward the net neutrality rules and is reviewing the carrier's proposed $49 billion acquisition of satellite television provider DirecTV.

AT&T now joins industry trade groups representing wireless carriers, cable companies and Internet providers that have sued to overturn the rules. The lawsuits arrived within a day of the rules being published in the Federal Register, the starting gun for legal challenges.

AT&T's filing is nearly identical to the ones by the National Cable & Telecommunications Association, United States Telecom Association and the CTIA, which represents wireless carriers. The briefs are only a few pages and allege the rules are arbitrary and capricious, and violate federal law.

Specifically, AT&T and the trade groups challenge the FCC's decision to reclassify the Internet as a telecommunications service, which subjects it to greater oversight under the rules used to regulate the phone system as a utility.

The American Cable Association also filed a lawsuit Tuesday seeking to overturn the rules.

AT&T's lawsuit is notable because the company stayed out of the two previous lawsuits against net neutrality. In 2010, Comcast successfully sued to overturn an attempt by the FCC to sanction it for throttling a file sharing service, and Verizon successfully sued to overturn new rules passed by the FCC.

AT&T and the trade groups have said they support net neutrality but oppose the classification decision.

The cases, so far all filed in U.S. Court of Appeals for the District of Columbia Circuit, will be consolidated into a single case. If other cases are filed in other jurisdictions within 10 days of publication in the Federal Register, a lottery will be held to determine where the case is heard.

Write to Ryan Knutson at ryan.knutson@wsj.com

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