Other Types and Pseudo Resource Records
Other types of records simply provide some types of information (for example, an HINFO record gives a description of the type of computer/OS a host uses), or others return data used in experimental features. The "type" field is also used in the protocol for various operations.
| Code | Number | Defining RFC | Description | Function |
|---|---|---|---|---|
| * | 255 | RFC 1035 | All cached records | Returns all records of all types known to the name server. If the name server does not have any information on the name, the request will be forwarded on. The records returned may not be complete. For example, if there is both an A and an MX for a name, but the name server has only the A record cached, only the A record will be returned. Sometimes referred to as "ANY", for example in Windows nslookup and Wireshark. |
| AXFR | 252 | RFC 1035 | Authoritative Zone Transfer | Transfer entire zone file from the master name server to secondary name servers. |
| IXFR | 251 | RFC 1996 | Incremental Zone Transfer | Requests a zone transfer of the given zone but only differences from a previous serial number. This request may be ignored and a full (AXFR) sent in response if the authoritative server is unable to fulfill the request due to configuration or lack of required deltas. |
| OPT | 41 | RFC 2671 | Option | This is a "pseudo DNS record type" needed to support EDNS |
Read more about this topic: Start Of Authority
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