Type: A - Point subdomain.domain.com to a hard coded IP Address.
Type: MX - Point subdomain.domain.com to a mail server. These type of records are special for just mail servers, they can co-exist with A records, and their only use is for routing mail to a different location. All mail implementations check for this record first before attempting to route an e-mail message. If a MX record does not exist for a host, an e-mail delivery would be attempted directly to the IP that the hostname resolves to.
Type: AAAA - Point subdomain.domain.com to a IPv6 address. Useful for those who are using IPv6 on their personal networks or those who are using a IPv4 to IPv6 tunnel at home.
Type: CNAME - Point subdomain.domain.com to another hostname. Good for those who are using other dynamic DNS services. You can create a CNAME record to another host and whatever subdomain.domain.com you choose here will go to whatever IP address the CNAMEd host has.
Type: NS - Point subdomain.domain.com to another NAMESERVER.
Type: TXT - Requested by users of the system, used by SPF spam rejecting system
Type: LOC - A means for Expressing Location Information in the Domain Name System.
RFC1876 has the complete explanation.
To find your latitude/longitude location, you may find Map-O-Rama of use.
Type: RP - The Responsible Person RR.
RP has the following format:
RP <mbox-dname> <txt-dname>
Both RDATA fields are required in all RP RRs.
The first field, <mbox-dname>, is a domain name that specifies the mailbox for the responsible person.
The second field, <txt-dname>, is a domain name for which TXT RR's exist. A subsequent query can be performed to retrieve the associated TXT resource records at .
RFC1183 has the complete explanation.
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