But, the query is for 5.211.173.198.in-addr.arpa (not 211.173.198.in-addr.arpa). Although the server should respond to the 211.173.198.in-addr.arpa request, is it required to?
u.ns.verio.net does respond to the query for 5.211.173.198.in-addr.arpa's PTR record from here, and a query using BIND8 works fine.
I went to a site Alabama, and his PTR resolves fine, including the full Class C delegated to his NS:
# dig -x 198.173.211 any
; <<>> DiG 8.3 <<>> -x any ;; res options: init recurs defnam dnsrch ;; got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2 ;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 3 ;; QUERY SECTION: ;; 211.173.198.in-addr.arpa, type = ANY, class = IN
;; ANSWER SECTION:
211.173.198.in-addr.arpa. 1H IN NS dns1.cribellum.net.
211.173.198.in-addr.arpa. 1H IN NS c.ns.verio.net.
211.173.198.in-addr.arpa. 1H IN NS u.ns.verio.net.
211.173.198.in-addr.arpa. 1H IN NS dns1.digital-66.com.
211.173.198.in-addr.arpa. 1H IN SOA dns1.cribellum.com. webmaster.cribellum.com. (
604 ; serial
15M ; refresh
10M ; retry
1D ; expiry
1H ) ; minimum
;; ADDITIONAL SECTION: dns1.cribellum.net. 23h59m49s IN A 198.173.211.2 c.ns.verio.net. 14h12m3s IN A 129.250.35.33 u.ns.verio.net. 14h12m3s IN A 192.67.14.17
Since I know my DNS (it's my main DNS) works well for all other work, I conclude that AOL and I are having similar problems doing the resolution, at least some of the time. Maybe some routing problem somewhere.
Len
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