The nameserver tester allows a query of information for all nameservers that are given for the specified domain.
The returned data allows a check whether the nameservers show the same stored data everywhere and are synchronous.
This query can help diagnose unusual errors, such as E-mails that are supposedly delivered but then disappear, or E-mails delivered only from one server but not from another server that should be just as valid.
Field |
Description |
|---|---|
Enter the domain to be tested for. |
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Here you can select which aspect of the DNS record is to be output in the result. "MX": returns the defined mail server "NS": returns which other nameservers are known to this nameserver "SOA": returns the more detailed SOA information for the domain or zone, such as the administrator's email address and various validity periods "A": returns the nameserver IP "AAAA": returns the IPv6 address of the nameserver "TXT": returns the content of the TXT entry, usually the SPF Record "CNAME": (instead of the A record if the domain or subdomain is the alias of another domain) returns the CNAME record |
Via Query, the test is started.
Via the Share test results button 
, the result of the test is copied to the clipboard as a URL and can thus be passed on to other people.
The following information is displayed for each name server:
Output |
Description |
|---|---|
Domain of the name server |
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"zone": the zone file is maintained by the domain hoster. "glue": the glue file is maintained by the domain registrar. The goal is for the nameserver to show the same data for both sources. If this is not the case, troubleshooting must be initiated. |
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IP of the name server |
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"Time to Live" of the selected entry (MX, SOA, A...): returns the validity period of the resolution in seconds. Example: 86400 seconds corresponds to 24 hours, that means if the data is changed, it will take 24 hours for it to be updated. |
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Shows the priority, if any. 0 means that no priority is entered (default). |
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Shows the corresponding mail server. |
Troubleshooting
Each nameserver must be entered in the Zone file and the Glue file. If the sources of Zone and Glue give different results, this must be remedied.
- For a change in the Zone file, the domain hoster must be contacted.
- For a change in the Glue file, the domain registrar must be contacted.
- If all domains are hosted by the same provider and there are still discrepancies, a ticket should be opened so that the inconsistent data can be corrected.
- If the domains are hosted by different providers, it should be determined a) whether this is necessary and b) why the synchronisation does not work.
