IN
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... hand, and that different parts of the tree can have different implied
semantics. For example, the IN-ADDR.ARPA domain is organized and
distributed by network ...
... IN ...
... TTLs are integers, and the type mnemonic is
always last. The IN class and TTL values are often omitted from examples
...
...
52.0.0.10.IN-ADDR.ARPA IN PTR C.ISI.EDU
...
...
52.0.0.10.IN-ADDR.ARPA IN PTR C.ISI.EDU
...
... For example, a mailer tying to send mail to Mockapetris@ISI.EDU might
ask the resolver for mail information about ISI.EDU, resulting in a
query for QNAME=ISI.EDU, QTYPE=MX, QCLASS=IN. The response's answer
section would be:
...
... character string. The octets of the IP address are reversed,
used as name components, and suffixed with "IN-ADDR.ARPA". A
type PTR query is used to get the RR ...
... name server for the root, MIL, and EDU domains of the IN
class, and would have zones for these domains. The zone data for the
...
... IN-ADDR.ARPA. PTR C.ISI.EDU.
103.0.3.26.IN-ADDR.ARPA. PTR A.ISI.EDU.
A.ISI.EDU. 86400 A 26.3.0.103
...
... Question | QNAME=SRI-NIC.ARPA., QCLASS=IN, QTYPE=A |
+---------------------------------------------------+
Answer | <empty> |
...
... Question | QNAME=SRI-NIC.ARPA., QCLASS=IN, QTYPE=A |
+---------------------------------------------------+
Answer | SRI-NIC ...
... ARPA. 86400 IN A 26.0.0.73 |
| 86400 IN A 10.0.0.51 |
+---------------------------------------------------+
Authority ...
... Question | QNAME=SRI-NIC.ARPA., QCLASS=IN, QTYPE=A |
+---------------------------------------------------+
Answer | SRI-NIC ...
... ARPA. 1777 IN A 10.0.0.51 |
| 1777 IN A 26.0.0.73 |
+---------------------------------------------------+
Authority ...
... Question | QNAME=SRI-NIC.ARPA., QCLASS=IN, QTYPE=* |
+---------------------------------------------------+
Answer | SRI-NIC ...
... Question | QNAME=SRI-NIC.ARPA., QCLASS=IN, QTYPE=* |
+---------------------------------------------------+
Answer | SRI-NIC ...
... Answer | SRI-NIC.ARPA. 12345 IN A 26.0.0.73 |
| A 10.0.0.51 |
+---------------------------------------------------+
...
... Question | QNAME=SRI-NIC.ARPA., QCLASS=IN, QTYPE=* |
+---------------------------------------------------+
Answer | SRI-NIC ...
... Answer | SRI-NIC.ARPA. 1290 IN HINFO DEC-2060 TOPS20 |
+---------------------------------------------------+
Authority ...
... Question | QNAME=SRI-NIC.ARPA., QCLASS=IN, QTYPE=MX |
+---------------------------------------------------+
Answer | SRI-NIC ...
... Additional | SRI-NIC.ARPA. 86400 IN A 26.0.0.73 |
| A 10.0.0.51 |
+---------------------------------------------------+
...
... Question | QNAME=SRI-NIC.ARPA., QCLASS=IN, QTYPE=NS |
+---------------------------------------------------+
...
... Question | QNAME=SIR-NIC.ARPA., QCLASS=IN, QTYPE=A |
+---------------------------------------------------+
Answer | <empty> |
...
... Header | OPCODE=SQUERY, RESPONSE |
+---------------------------------------------------+
Question | QNAME=BRL.MIL, QCLASS=IN, QTYPE=A |
+---------------------------------------------------+
Answer | <empty> |
...
... +---------------------------------------------------+
Authority | MIL. 86400 IN NS SRI-NIC.ARPA ...
... +---------------------------------------------------+
Question | QNAME=USC-ISIC.ARPA., QCLASS=IN, QTYPE=A |
+---------------------------------------------------+
Answer | USC-ISIC.ARPA ...
... +---------------------------------------------------+
Answer | USC-ISIC.ARPA. 86400 IN CNAME C.ISI.EDU. |
| C.ISI.EDU. 86400 IN ...
... IN CNAME C.ISI.EDU. |
| C.ISI.EDU. 86400 IN A 10.0.0.52 |
+---------------------------------------------------+
Authority ...
... +---------------------------------------------------+
Question | QNAME=USC-ISIC.ARPA., QCLASS=IN, QTYPE=A |
+---------------------------------------------------+
Answer | USC-ISIC.ARPA ...
... +---------------------------------------------------+
Answer | USC-ISIC.ARPA. 86400 IN CNAME C.ISI.EDU. |
+---------------------------------------------------+
...
... +---------------------------------------------------+
Authority | ISI.EDU. 172800 IN NS VAXA.ISI.EDU. |
| NS ...
... +---------------------------------------------------+
Question | QNAME=USC-ISIC.ARPA., QCLASS=IN, QTYPE=A |
+---------------------------------------------------+
Answer | USC-ISIC.ARPA ...
... +---------------------------------------------------+
Answer | USC-ISIC.ARPA. 86400 IN CNAME C.ISI.EDU. |
+---------------------------------------------------+
...
... Header | OPCODE=SQUERY |
+---------------------------------------------------+
Question | QNAME=ISI.EDU., QCLASS=IN, QTYPE=MX |
+---------------------------------------------------+
Answer | <empty> |
...
... Header | OPCODE=SQUERY, RESPONSE |
+---------------------------------------------------+
Question | QNAME=ISI.EDU., QCLASS=IN, QTYPE=MX |
+---------------------------------------------------+
Answer | <empty> |
...
... +---------------------------------------------------+
Authority | ISI.EDU. 172800 IN NS VAXA.ISI.EDU. |
| NS ...
... AA |
+---------------------------------------------------+
Question | QNAME=ISI.EDU., QCLASS=IN, QTYPE=MX |
+---------------------------------------------------+
Answer | ISI.EDU. MX 10 VENERA.ISI.EDU. |
...
... The resolver would translate this into a request for PTR RRs for
65.0.6.26.IN-ADDR.ARPA. This information is not in the cache, so the
resolver would look for foreign servers to ask. No servers would match,
...
... domain are in the cache, but ISI.EDU is not an ancestor of
65.0.6.26.IN-ADDR.ARPA, so the SBELT is used.)
...
... AA |
+---------------------------------------------------+
Question | QNAME=65.0.6.26.IN-ADDR.ARPA.,QCLASS=IN,QTYPE=PTR |
+---------------------------------------------------+
...
... +---------------------------------------------------+
Question | QNAME=65.0.6.26.IN-ADDR.ARPA.,QCLASS=IN,QTYPE=PTR |
+---------------------------------------------------+
Answer | 65.0.6.26.IN-ADDR.ARPA ...
... IN,QTYPE=PTR |
+---------------------------------------------------+
Answer | 65.0.6.26.IN-ADDR.ARPA. PTR ACC.ARPA. |
+---------------------------------------------------+
...