As you have installed ldns, now you may check out the Dyn's dns_lg source code from its source code repository:

git clone [email protected]:dyninc/dns_lg.git
    
cd dns_lg/
  

Now, you may run the application simply by executing api.py. Running it produces the following output:

$ python api.py
* Running on http://0.0.0.0:8185/
 (Press CTRL+C to quit)

Now open another console window to run a curl:

curl http://0.0.0.0:8185/cnn.com/

This will output a line to the preceding api.py console:

127.0.0.1 - - [15/Jul/2017 23:33:40] 
"GET /cnn.com/ HTTP/1.1" 200 -
  

The curl command produces the following output with the detailed DNS information from the looking glass implementation:

$ curl http://0.0.0.0:8185/cnn.com/
{
  "AdditionalSection": [
    {
      "Address": "205.251.192.47", 
      "Class": "IN", 
      "Name": "ns-47.awsdns-05.com.", 
      "TTL": "20545", 
      "Type": "A"
    }, 
    {
      "Address": "205.251.194.64", 
      "Class": "IN", 
      "Name": "ns-576.awsdns-08.net.", 
      "TTL": "20545", 
      "Type": "A"
    }
  ], 
  "AnswerSection": [], 
  "AuthoritySection": [
    {
      "Class": "IN", 
      "Name": "cnn.com.", 
      "TTL": "20545", 
      "Target": "ns-47.awsdns-05.com.", 
      "Type": "NS"
    }, 
    {
      "Class": "IN", 
      "Name": "cnn.com.", 
      "TTL": "20545", 
      "Target": "ns-1086.awsdns-07.org.", 
      "Type": "NS"
    }, 
    {
      "Class": "IN", 
      "Name": "cnn.com.", 
      "TTL": "20545", 
      "Target": "ns-576.awsdns-08.net.", 
      "Type": "NS"
    }, 
    {
      "Class": "IN", 
      "Name": "cnn.com.", 
      "TTL": "20545", 
      "Target": "ns-1630.awsdns-11.co.uk.", 
      "Type": "NS"
    }
  ], 
  "None": "true", 
  "Query": {
    "Duration": 118, 
    "Server": "", 
    "ServerIP": "127.0.1.1", 
    "Versions": "Dyn DNS Looking Glass 1.0.0"
  }, 
  "QuestionSection": {
    "Qclass": "IN", 
    "Qname": "cnn.com.", 
    "Qtype": "A"
  }, 
  "ReturnCode": "NOERROR"
}

The preceding output shows Dyn's dns_lg and curl in action. Please note that currently Dyn's dns_lg works only in Python 2.x. However, with some minor fixes, this can easily be ported to Python 3.x. As we ported bgperf to Python 3.x in a previous recipe, this is left as an exercise for those who like to port this to Python 3.x.