Split DNS

Split DNS is a DNS architecture that provides different DNS information for the same domain name. The response received by a client can depend on whether the DNS request originates from an internal corporate network or the public internet. Internal users may therefore receive a private IP address for a server, while external users receive a public IP address for the same hostname. This separation is commonly implemented through different internal and external DNS zones or DNS servers. Split DNS is used in enterprise networks to provide controlled access to internal resources while making public services available through the same domain names. Also known as Split-Horizon DNS, the approach is commonly used in hybrid IT infrastructures, VPN environments and networks with internal applications.