Tool retrieves real-time information about authoritative name servers for domains. Helps identify DNS setup issues and troubleshoot domain problems. Available for free with unlimited queries and detailed results
Server names identify computers on the Internet. Typically consist of organization name and location. Must be unique, memorable, and easy to pronounce
BGP serves as the Internet's postal service, routing data between autonomous systems. Internet is divided into thousands of autonomous systems (ASes). ASes are like individual post office branches, routing data through internal routers
DNS translates human-readable domain names into IP addresses for network communication. A domain can have multiple IP addresses, especially in load balancing scenarios. DNS lookup enables users to access websites using familiar domain names
BGP is the universal routing protocol for internet backbone. First developed in 1989, current version is BGP4 (RFC 4271). Connects different autonomous systems (AS) through exterior gateway protocol. Uses TCP port 179 for transport and maintains connections
DNS port is a communication port assigned by DNS servers for domain name resolution. Standard DNS port is 53, used for both TCP and UDP communication. DNS switches to TCP port 53 when UDP packet size exceeds limit