Endurance International said on Monday it would buy online marketer Constant Contact in deal valued at about $1.1 billion to expand beyond its traditional Web-hosting business.

The deal will add Constant Contact’s online marketing tools such as email marketing, events management and social media integration to Endurance’s portfolio of Web-hosting software for small and medium-sized businesses.

Endurance, whose brands include BigRock, HostGator and FatCow.com, already has an agreement to provide Constant Contact’s email marketing tools to its subscribers.

The company now has over 3 million subscribers. With the deal, it expects boosting its paying subscribers to over 5 million.

Constant Contact will operate as a separate brand.

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