LEGACY - allocated by the central Internet Registry (IR) prior to the Regional Internet Registries (RIRs). This address space is now administered by individual RIRs as noted, including maintenance of WHOIS Directory and reverse DNS records. Assignments from these blocks are distributed globally on a regional basis.
172.16.0.0/12 reserved for Private-Use Networks [RFC1918]. Complete registration details are found in [IANA registry iana-ipv4-special-registry].
questionmark.guide DNS Resource Records
In this section you will find important DNS resource records for questionmark.guide. SOA records, Name Server records, and MX records are included when available. Additional supporting data includes serial numbers, refresh rates, retry times, TTL, priority, and length to expire will be shown.