Level3 provides one of the most commonly used DNS services in the world, with many ISPs and mobile data providers relying on their DNS servers. Verizon's DNS servers are frequently listed as 4.2.2.5, 4.2.2.4, 4.2.2.3, 4.2.2.2, and/or 4.2.2.1, however those DNS servers are actually alternate addresses of the Level3 server addresses shown above.

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IP Details for 4.2.2.2 - See Your Public Address