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The characteristic payload information of an MX record [1] is a preference value (above labelled "Priority"), and the domain name of a mailserver ("Host" above).. The priority field identifies which mailserver should be preferred - in this case the values are both 10, so mail would be expected to flow evenly to both onemail.example.com and twomail.example.com - a common configuration.
Note that this has nothing to do with DNS Security. It is Informational status, rather than being on the IETF standards-track. It has always had limited deployment, but is still in use. LOC: 29 RFC 1876 Location record Specifies a geographical location associated with a domain name MX: 15 RFC 1035 [1] and RFC 7505 Mail exchange record
dnscache — the DNS resolver and cache. tinydns — a database-driven DNS server. walldns — a "reverse DNS wall", providing IP address-to-domain name lookup only. rbldns — a server designed for DNS blacklisting service. pickdns — a database-driven server that chooses from matching records depending on the requestor's location.
Microsoft DNS: Microsoft: Included with Windows Server: No Clickwrap license: djbdns: Daniel J. Bernstein: Free Yes Public domain: Dnsmasq: Simon Kelley Free Yes GPL: Simple DNS Plus: JH Software $79 – $379 No Clickwrap license: NSD: NLnet Labs Free Yes BSD variant Knot DNS: CZ.NIC: Free Yes GPL: Knot Resolver: CZ.NIC: Free Yes GPL: PowerDNS ...
dnsmasq caches DNS records, reducing the load on upstream nameservers and improving performance, and can be configured to automatically pick up the addresses of its upstream servers. dnsmasq accepts DNS queries and either answers them from a small, local cache or forwards them to a real, recursive DNS server.
nslookup operates in interactive or non-interactive mode. When used interactively by invoking it without arguments or when the first argument is - (minus sign) and the second argument is a hostname or Internet address of a name server, the user issues parameter configurations or requests when presented with the nslookup prompt (>).
There’s an easy way to find out: conduct a reverse phone lookup — for free. But is there a truly free reverse phone lookup? Yes — there are plenty of sites that offer free reverse phone lookups.
GeoDNS (or GeoIP) is a patch for BIND DNS server software, to allow geographical split horizon (different DNS answers based on client's geographical location), based on MaxMind's geoip (commercial) or geolite (free) databases. The objective of this technology is to enhance the DNS resolution based on the geographical location of the client. [1]