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Forfatter(e) Olivier Bonaventure
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The DNS transaction identifier


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