Domain to IP, Whois and certificate checker.

The prime motivation to write this is to parse a list of hostnames (FQDNs) and create a CSV file as output to process the current state of these.

The output contains the:

• FQDN
• IP address (first A record returned)
• Prefix of the IP address in its AS
• The Autonomous System Number associated to the prefix.
• Country of AS registration
• Registrar
• Last update for the prefix
• Last update for the ASN
• Subject distinguished name.
  • This is from the certificate found on port 443 using TLS, as with other certificate fields.
• Issuer distinguished name.
• Common Names
  • Concatenated for the case when there are two CN fields.
• Subject Alternative Names, of the type DNS.
  • Concatenated string.
• Not valid before time of the certificate.
• Not valid after time of the certificate

Command-line options

% ./main.py --help
usage: cli.py [-h] [-v] [--parallel] [-i INPUT_FILENAME] [-o OUTPUT_FILENAME]

options:
  -h, --help            show this help message and exit
  -v, --verbose         Verbose mode. Default is off
  --parallel            Use parallel approachauthentication key.
  -i INPUT_FILENAME, --input-filename INPUT_FILENAME
                        Input filename.
  -o OUTPUT_FILENAME, --output-filename OUTPUT_FILENAME
                        Output filename.

Dependencies

pip3 install validators
pip3 install dnspython
pip3 install cryptography

Or use the requirements.txt file.

Example run

% ./main.py --input-filename samples/pkishort.txt --output-filename samples/short.csv -v
Input filename: samples/pkishort.txt
Output filename: samples/short.csv

Sample input and output

Input file: pkishort.txt

Output file: short.csv

Acknowledgements:

The example "pkioverheid.txt" file was created by Hugo Leisink.