[dns-operations] Quick analysis of TLD SOA's

[Jake Zack]

And NegTTL expire times...more than half are set to 3 hours or less.

Just a handful of domains really bloat the stats, though...

Checked 353 TLD's
Average NegTTL Time in days: 0.665676476760046

XN--LGBBAT1AD8J: 432000 - 5 days
DZ: 432000 - 5 days
AZ: 391200 - 4.52777777777778 days
GB: 360000 - 4.16666666666667 days
DJ: 345600 - 4 days
PY: 345600 - 4 days
LS: 345600 - 4 days
GU: 345600 - 4 days
GE: 345600 - 4 days
GP: 345600 - 4 days
MQ: 345600 - 4 days

I only point this out for the anomaly of it all...need to satisfy my  
own curiosity.

-Jacob Zack
DNS Administrator - CIRA (.CA TLD)


On 13-Jul-11, at 11:03 AM, Jake Zack wrote:

> I queried all TLD's for their SOA record and analyzed expire, refresh,
> and retry times.
>
> Found a few things that seemed odd to me, but may well be perfectly
> normal and acceptable to the rest of the community, so I just wanted
> to throw it out there and perhaps hear others thoughts.
>
> Checked 303 TLD's.
> Average Expire Time in days: 22.37
>
> BO: 18144007 - 210.00 days
> TRAVEL: 15724800 - 182 days
> EG: 12096000 - 140 days
> AERO: 6048000 - 70 days
> LA: 6048000 - 70 days
> HM: 6048000 - 70 days
> ...
> MO: 432000 - 5 days
> UY: 432000 - 5 days
> VI: 216000 - 2.5 days
> BF: 86400 - 1 days
> KM: 86400 - 1 days
> AW: 60480 - 0.7 days
> PW: 10800 - 0.125 days
>
> ...I understand large expire times (.CA's was set to 1 week, but as of
> next zone publish (11:00am EDT) will become 40 days due to this
> analysis)...but I'm wondering why some TLD's have opted for incredibly
> short (<1day) expire times.  Any thoughts on this?
>
> Also, in comparing refresh time with retry time, I noticed that all
> but 3 TLD's have their refresh time set higher than their retry time.
> The 3 who break with this convention are:
>
> ET: refresh(600) < retry(1800)
> FM: refresh(1800) < retry(3600)
> LA: refresh(900) < retry(1800)
>
> In this case, though, I can't really think of a situation where one
> would intentionally do this.  Thoughts?
>
> -Jacob Zack
> DNS Administrator - CIRA (.CA TLD)
>
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