Frequently Asked Questions

How to speed up a bit the process/test?


Beware, when talking about speed a lot a thing have to be taken in consideration. Indeed here is a non exaustive list of things which fluctuate testing speed.

  • Bandwidth.
  • DNS Server response time.
  • CPU.
  • ISP blocking a big amount of connection to the outside world.
  • Our databases management (do not apply for MySQL and MariaDB format).
  • Amount of data to test.

I have multiple CPU

Simply use the -m | --multiprocess argument to activate the usage of multiple processes. You can in addition to that use the -p | --processes argument to tell set the number of simultaneous process to run.


A good number for -p is your number of CPU_cores -1, to leave room for orther processes to work. Unless you have a dedicated installation for this work.

Inside a Unix based system, you can use this code snippet to see how many CPU and cores you have.

$ lscpu | grep -E '^Thread|^Core|^Socket|^CPU\('


DO NOT try to exceed your total number of CPU cores (as -p | --processes), if you want to keep your machine somehow alive and healthy.

I do not have multiple CPU

In case you only have a single core, you should disable the usage of the WHOIS lookup by adding the to your command line or switching the value of no_whois to True in your configuration file.

As example:

$ PyFunceble --no-whois -d

This action will speed up the script because it only use the equivalent of nslookup and the HTTP status code to determine the availability status.


PyFunceble request the WHOIS record in order to avoid specific false positive case. If the usage of WHOIS request is disabled, all domains which are still registered but not assigned to an IP address, would be flagged as INACTIVE.

It’s not a problem if you keep/use the database system because the domain will be retested over time. But please keep in mind that without the database system the accuracy of the result is not guaranteed.