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The correct answer is the URL - Uniform Resource Locator, as it is not a recognized type of DNS record. DNS (Domain Name System) is responsible for translating human-friendly domain names into IP addresses, allowing users to access websites using names rather than numeric addresses.

There are several types of DNS records specifically designed to handle various functionalities within the DNS system:

- NS (Name Server) records specify the servers that are authoritative for a particular domain, indicating which servers hold the DNS records for that domain.

- MX (Mail Exchange) records are used to route email messages to the correct mail servers, indicating which server should handle emails sent to addresses within the domain.

- SOA (Start of Authority) records provide essential information about a domain, including details such as the primary name server for the domain, the email address of the domain administrator, and serial numbers for zone transfers.

In contrast, a URL serves a different purpose outside of DNS records; it specifically denotes a web address, combining both the protocol (like HTTP) and the domain name, among other components. URLs do not function as DNS records, which is why URL is the correct choice as the type that is NOT a DNS record type.