MX Guarddog IP Address List
MX Guarddog publishes our IP Addresses for email administrators who wish to perform server hardening for prevention of direct delivery, this information is published for advanced users only.
If you are controlling access to your email server by IP Address, you will need to allow our delivery servers to connect from the following addresses.
Allow access from all addresses to guarantee your email can be delivered. We try and make as few changes to this list as possible... and will inform all impacted customers via email of any upcoming changes.
Active MX Guarddog IP Addresses
|126.96.36.199/29||Phoenix AZ, USA||Added Aug. 2014|
|188.8.131.52/28||Phoenix AZ, USA||Added Sept. 2015 [*]|
Customers joining on or after September 1, 2015
|184.108.40.206/32||British Columbia, Canada||Added Nov. 2018 [*]|
Customers joining on or after November 1, 2018
|220.127.116.11/29||Dallas TX, USA||Added Nov. 2021 [*]|
Customers joining on or after November 1, 2021
Resolution By Name
If you have one of those fancy firewalls that can apply rules by using a host name, we got you covered. We publish a list of our active IP addresses under the name servers.ik2.com.
Retired IP Addresses
Retired addresses are no longer being used, if you previously allowed access to any of these addresses you can now safely remove them.
- 18.104.22.168/29 - retired November 2021
- 22.214.171.124 - retired May 2021
- 126.96.36.199 - retired January 2017
- 188.8.131.52 - retired October 2014
- 184.108.40.206 - retired October 2014
- 220.127.116.11 - retired July 2014
- 18.104.22.168 - retired March 2014
- 22.214.171.124 - retired March 2014