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A Nagios (and compatible) plugin to check the impending expiration of a domain name. It relies on RDAP exclusively (no whois) and works with every top-level domain with RDAP (which includes all the ICANN ones).


check_expire follows the usual Nagios rules. The options are:

  • -H: domain name to monitor
  • -c: critical threshold in days
  • -w: warning threshold in days
  • -v: verbose details in output
  • -u: unixtime output
  • -t: timeout for RDAP requetss (in seconds)


You need Python 3 and Requests. You can install Requests, for instance, with pip pip3 install requests.

Then, copy the script check_expire and the file ianardap.pyto the directory of local plugins.

Icinga configuration

If you use Icinga, here is a possible definition of the command:

object CheckCommand "expiration" {
  command = [ PluginContribDir + "/check_expire" ]

  arguments = {
      "-H" = "$address$",
      "-c" = "$expiration_critical$",
      "-w" = "$expiration_warning$",
      "-t" = "$expiration_timeout$",
      "-v" = { set_if = "$expiration_verbose$" }


apply Service "expiration" {
  import "generic-service"

  check_command = "expiration"

  assign where host.address && host.vars.monitor_expiration

And a possible use:

object Host "bortzmeyer-org" {

  address = "bortzmeyer.org"

  vars.monitor_expiration = true
  vars.expiration_verbose = true


Zabbix configuration

For monitoring systems that do not rely on exit codes but on calculation mechanism based on the metric they receive you can use the -u option that will only return the expiration date in unixtime format.

For instance, you can use the following in zabbix 5.4:

  • item: check_expire["-H","{HOST.CONN}","-u"]
  • trigger (30 days before expiration): last(/check_expire["-H","{HOST.CONN}","-u"])-now()<2592000

Where 2592000 is the number of seconds in 30 days.




Stéphane Bortzmeyer stephane+chapril@bortzmeyer.org.

Reference site

https://forge.chapril.org/bortzmeyer/check_expire Use the Gitea issue tracker to report bugs or wishes.