(thing) by cyan Sun Mar 05 2000 at 2:30:53
A DNS record type as per RFC 1035.

PTR in this context is short for pointer. This type of record is used exclusively for doing reverse DNS. A legal PTR record must point to a hostname which effectively resolves to the same IP address which is being reverse resolved.

There is, however, a cool exception to this known as the CNAME trick.

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