Further investigation shows that most zones are sparsely populated. More than half of them contains one host only or even none at all. Roughly 2000 zones exist with two to nine hosts, another 2200 have between 10 and 99 hosts. Just some 720 zones show 100 to 999 inhabitants, 120 zones conribute 1000 to 9999 hosts and only five big players present a population of over 10000. In the latter categories most universities and long time commercial Internet users can be found.
This month 288 tickets were sent out (funny, exactly 100 more than in March), bringing more than 800 DNS configuration errors to the attention of the administrators. As usual there were far more errors flagged (nearly 1100) but filtered before sending.
Approx. 10 % of the tickets bounced back - again a slight improvement in quality.
For the first time tickets for illegal hostnames (i.e. those not conforming to RFC952/RFC1123) were generated. There were nearly 300 DNS owner names with errors in approx. 60 zones. To prevent resource starvation names containing '_' were not flagged separately. 9000 more names would have been a bit too much. Readers may have a look at the syntax rules for DNS hostnames (in German).
For quite some time now the longest hostname in the DE namespace has been the same:
uli-eder.ludwig-uhland-institut.sozialwissenschaften.uni-tuebingen.deThis one consists of 69 characters which is again interesting in the context of the aforementioned syntax discussion.