Google Fiber, the tech giant's hyper-fast Internet network, is coming to four more metro areas, the company announced on Tuesday.

Fiber is Google's Internet service that has a "connection that’s up to 100 times faster than today’s basic broadband speeds," according to Google. The service will next come to Atlanta, Nashville and two North Carolina cities: Raleigh-Durham and Charlotte. That's a grand total of 18 communities, Google announced on its Fiber blog.

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Right now, the service — which was introduced in 2012 — is only available in Kansas City, Mo., as well as Austin, Texas, and Provo, Utah. Google has been very deliberate with its expansion of the service, carefully selecting the metro areas that it deems worth enough for Fiber. The four cities getting Google Fiber were already on Google's list for the "future of Fiber."

Image: Google

Five other cities — like Portland, Ore., and San Jose, Calif. — are on Google's lists of prospective candidates, but the future of Google Fiber in those locations remains uncertain.

"We’re also continuing to explore bringing fiber to five additional metro areas—Phoenix, Portland, Salt Lake City, San Antonio and San Jose, and will have updates on these potential Fiber cities later this year," reads Google's blog post.

It's expected that prices will fall in line with those in Kansas City: $130 per month for 1 gigabit per second (Gbps) Internet plus TV; $70 for 1Gbps Internet without TV; and free (albeit slower) Internet with a one-time $300 construction fee.

It may take some time before the new cities are up and running on Google's Internet service. Residents of Austin were able to start signing up in December 2014, more than a year and a half after Google first announced its expansion to that city.

Additional reporting by Jason Abbruzzese.

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