The DNS transaction identifier

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The DNS transaction identifier

The transaction identifier is an important part of the DNS header. Could you propose the transaction identifier for the DNS response ? Note that your answer must be provided in hexadecimal format

#	Length	Summary	Status
0	41 bytes	`Domain Name System (query)`
1	69 bytes	`Domain Name System (response)`

0000  f696003500294709  16eb012000010000
0010  0000000003777777  076578616d706c65
0020  036f726700001c00  01

0000  ö..5.)G..ë. ....
0010  .....www.example
0020  .org.....

User Datagram Protocol
- Source Port: 63126
- Destination Port: 53
- Length: 41
- Checksum: 0x4709 [unverified]
Domain Name System (query)
- Transaction ID: 0x16eb
- Flags: 0x0120 Standard query
  - 0... .... .... .... = Response: Message is a query
  - .000 0... .... .... = Opcode: Standard query (0)
  - .... ..0. .... .... = Truncated: Message is not truncated
  - .... ...1 .... .... = Recursion desired: Do query recursively
  - .... .... .0.. .... = Z: reserved (0)
  - .... .... ..1. .... = AD bit: Set
  - .... .... ...0 .... = Non-authenticated data: Unacceptable
- Questions: 1
- Answer RRs: 0
- Authority RRs: 0
- Additional RRs: 0
- Queries
  - www.example.org: type AAAA, class IN
    - Name: www.example.org
    - Name Length: 15
    - Label Count: 3
    - Type: AAAA (IPv6 Address) (28)
    - Class: IN (0x0001)

0000  0035f6960045a528  ????81a000010001
0010  0000000003777777  076578616d706c65
0020  036f726700001c00  01c00c001c000100
0030  0147d10010260628  0002200001024818
0040  9325c81946

0000  .5ö..E¥(??......
0010  .....www.example
0020  .org.....À......
0030  .GÑ..&.(.. ...H.
0040  .%È.F

User Datagram Protocol
- Source Port: 53
- Destination Port: 63126
- Length: 69
- Checksum: 0xa528 [unverified]
Domain Name System (response)
- Transaction ID: ?
- Flags: 0x81a0 Standard query response, No error
  - 1... .... .... .... = Response: Message is a response
  - .000 0... .... .... = Opcode: Standard query (0)
  - .... .0.. .... .... = Authoritative: Server is not an authority for domain
  - .... ..0. .... .... = Truncated: Message is not truncated
  - .... ...1 .... .... = Recursion desired: Do query recursively
  - .... .... 1... .... = Recursion available: Server can do recursive queries
  - .... .... .0.. .... = Z: reserved (0)
  - .... .... ..1. .... = Answer authenticated: Answer/authority portion was authenticated by the server
  - .... .... ...0 .... = Non-authenticated data: Unacceptable
  - .... .... .... 0000 = Reply code: No error (0)
- Questions: 1
- Answer RRs: 1
- Authority RRs: 0
- Additional RRs: 0
- Queries
  - www.example.org: type AAAA, class IN
    - Name: www.example.org
    - Name Length: 15
    - Label Count: 3
    - Type: AAAA (IPv6 Address) (28)
    - Class: IN (0x0001)
- Answers
  - www.example.org: type AAAA, class IN, addr 2606:2800:220:1:248:1893:25c8:1946
    - Name: www.example.org
    - Type: AAAA (IPv6 Address) (28)
    - Class: IN (0x0001)
    - Time to live: 83921
    - Data length: 16
    - AAAA Address: 2606:2800:220:1:248:1893:25c8:1946

Author(s)	Olivier Bonaventure
Deadline	No deadline
Submission limit	No limitation
Category tags	dns

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