Dns Soa Serial Number Format
HOWTO Fix SOA RR serial numbers. The SOA serial number is an unsigned 32-bit field with a maximum value of ( (2.32) -1), which gives a range of 0 to (the value zero may have special significance in certain DNS implementations and should be avoided), but the maximum increment to such a number is ( (2.31) - 1). May 12, 2015 I have a query that how to change the SOA serial number template of a DNS zone into DDMMYYYY format. Current serial number is 2269. Not sure if you can manipulate it using DNS console. I believe it is hard coded and can not be modified. More Information About Dns Soa Serial Number Format The serial number is an unsigned 32 bit value assigned to your SOA record must be between 1. 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.
When testing the SOA setting for example-domain.org on http://mxtoolbox.com/, it says that
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The entry is
That, however, is exactly what Amazon suggest in their Route 53 documentation on http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/SOA-NSrecords.html
mxtoolbox issues a warning - why? They also consider the missing DMARC settings as an error.
Please bear with me - I am not a sysadmin. Any hint that uses a language that a developer can understand is greatly appreciated.
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2 Answers
There is a recommendation that the SOA serial number use a format that is four digits of year, two digits of month, two digits of day and two digits of count of changes in the same day. This format is common, but far from universal (look at .COM for a high-profile example of a zone that doesn't). The tool you got the error message from is oversensitive and should be adjusted.
The SOASERIAL field is specified to be an an unsigned integer value that has special rules for how it wraps around, and consequently also for how serial numbers are compared, etc.
Dns Soa Serial Number Format Pdf
RFC1035 defines this field as:
SERIAL
The unsigned 32 bit version number of the original copy of the zone. Zone transfers preserve this value. This value wraps and should be compared using sequence space arithmetic.
Dns Soa Format
The arithmetic of serial numbers is explained in detail in RFC1982.
Anyway, the popular YYYYMMDDnn 'format' is just a convention for picking integer values such that, when written out in decimal, convey some meaningful information to humans (may be helpful when troubleshooting). The use of such values have no special meaning in the system itself and using values that do not follow this convention is not an error.