diff --git a/admin-guide/operations/ip-address-change.md b/admin-guide/operations/ip-address-change.md
index bbc64eea..ab4875f1 100644
--- a/admin-guide/operations/ip-address-change.md
+++ b/admin-guide/operations/ip-address-change.md
@@ -20,7 +20,7 @@ One day when there is Puppet available in the DMZ then it will handle the later
 | Zone      | Name Server (DNS)                                                                                     | Time Server (NTP)                                                                                 | Mail Relay (SMTP)                                                                         |
 |-----------|-------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------|
 | default   | `129.129.190.11` `129.129.230.11`                                                                     | `pstime1.psi.ch` `pstime2.psi.ch` `pstime3.psi.ch`                                                | `smtpint.psi.ch`                                                                          |
-| dmz/tier3 | `192.33.120.5` `192.33.121.5`                                                                         | `dmzpstime1.psi.ch` `dmzpstime2.psi.ch`                                                           | `smtpdmz.psi.ch`                                                                          |
+| dmz/tier3 | `192.33.120.5` `192.33.121.5`                                                                         | `dmztime1.psi.ch` `dmztime2.psi.ch`                                                           | `smtpdmz.psi.ch`                                                                          |
 | _source_  | [networking::nameservers](https://git.psi.ch/linux-infra/puppet/-/blob/preprod/data/common.yaml#L538) | [net_client::servers](https://git.psi.ch/linux-infra/puppet/-/blob/preprod/data/common.yaml#L595) | [mta::relays](https://git.psi.ch/linux-infra/puppet/-/blob/preprod/data/common.yaml#L527) |
 ## Select the Network Interface Device