openSUSE admin

I brought this up on the heroes mailing list in August, maybe it was forgotten or it was decided it didn't matter -

https://lists.opensuse.org/heroes/2016-08/msg00007.html

opensuse.org is 130.57.5.70, which reverse maps to a whole list:

;; ANSWER SECTION:
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.com.tr.
70.5.57.130.in-addr.arpa. 28714 IN PTR netiq.co.jp.
70.5.57.130.in-addr.arpa. 28714 IN PTR novell.kr.
70.5.57.130.in-addr.arpa. 28714 IN PTR novell.info.
70.5.57.130.in-addr.arpa. 28714 IN PTR icecore.com.
70.5.57.130.in-addr.arpa. 28714 IN PTR icecore.org.
70.5.57.130.in-addr.arpa. 28714 IN PTR kablink.com.
70.5.57.130.in-addr.arpa. 28714 IN PTR icecorps.com.
70.5.57.130.in-addr.arpa. 28714 IN PTR senforce.com.
70.5.57.130.in-addr.arpa. 28714 IN PTR sitescape.biz.
70.5.57.130.in-addr.arpa. 28714 IN PTR sitescape.com.
70.5.57.130.in-addr.arpa. 28714 IN PTR sitescape.net.
70.5.57.130.in-addr.arpa. 28714 IN PTR redirector.novell.com.
70.5.57.130.in-addr.arpa. 28714 IN PTR workloadiq.co.uk.
70.5.57.130.in-addr.arpa. 28714 IN PTR go-evolution.org.
70.5.57.130.in-addr.arpa. 28714 IN PTR novell-cebit.com.
70.5.57.130.in-addr.arpa. 28714 IN PTR powerconvert.com.
70.5.57.130.in-addr.arpa. 28714 IN PTR betterdesktop.org.
70.5.57.130.in-addr.arpa. 28714 IN PTR tagtechnologies.com.
70.5.57.130.in-addr.arpa. 28714 IN PTR mktg.novell.com.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.ae.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.al.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.br.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.co.za.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.dk.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.ee.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.gl.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.gr.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.hu.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.lv.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.mk.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.no.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.biz.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.com.br.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.com.gr.
70.5.57.130.in-addr.arpa. 28714 IN PTR suse.com.pl.

That's just not a proper DNS setup. It's not really important when it's
not a mailserver or doesn't use TLS, but a reverse map should only have
one result.

RFC1912 doesn't exactly describe the issue, but Section 2.1 does say "Make sure your PTR and A records match."
From a DNS point of view, having multiple PTR records for one address is perfectly valid,
it just doesn't work as expected.
The main thing is the client doing the reverse lookup, postfix or a
browser for instance. They only use one result, the first one. I
have seen this often enough with postfix.

http://serverfault.com/questions/618700/why-multiple-ptr-records-in-dns-is-not-recommended
(the first two answers).

https://en.wikipedia.org/wiki/Reverse_DNS_lookup#Multiple_pointer_records

If it were me, I would map 130.57.5.70 to "suse.com", that's all. Or
maybe "novell.com". Funny, neither one is in the current list of
PTRs :-)