SOA Serial Number Format is Invalid

  • Posted August 29, 2014

I have set up an Ubuntu box and everything seems to be working. Website shows, SSL is enabled and I thought everything was as it should but doing a check on mxtoolbox and i get the following warning:

SOA Serial Number Format is Invalid

The serial number is an unsigned 32 bit value assigned to your SOA record must be between 1 and 4294967295.

We will issue a warning if your serial is either invalid by being outside of the allowed range or if it does not conform to this format.

Is this something I have done or is this something related to the Digital Ocean NameServers?


What is your SOA in the DNS record?

Try the site to check your DNS records. That is one I use quite often. Its kinda similar to the old dnsreport before they ruined it.

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Hi there!

I have the same issue. Just checked and got that message: “Your SOA serial number is: 1413986340. This can be ok if you know what you are doing.” .

I don’t known what I’m doing :), so could someone please help us?


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Hi Thanks your your help I get the following from the intodns report:

Your SOA serial number is: 1409411920. This can be ok if you know what you are doing.