It seems that reverse dns is not working on the ibiblio boxes for ipv6 addresses after the recent move:

% ping6 2610:28:1000:1401::fed0:2
PING 2610:28:1000:1401::fed0:2(2610:28:1000:1401::fed0:2) 56 data bytes
64 bytes from 2610:28:1000:1401::fed0:2: icmp_seq=1 ttl=50 time=102 ms
64 bytes from 2610:28:1000:1401::fed0:2: icmp_seq=2 ttl=50 time=84.4 ms
^C
--- 2610:28:1000:1401::fed0:2 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 84.469/93.287/102.106/8.823 ms

% dig +trace -x 2610:28:1000:1401::fed0:0010

; <<>> DiG 9.7.3-RedHat-9.7.3-1.fc15 <<>> +trace -x 2610:28:1000:1401::fed0:0010
;; global options: +cmd
. 420800 IN NS e.root-servers.net.
. 420800 IN NS g.root-servers.net.
. 420800 IN NS k.root-servers.net.
. 420800 IN NS a.root-servers.net.
. 420800 IN NS c.root-servers.net.
. 420800 IN NS j.root-servers.net.
. 420800 IN NS l.root-servers.net.
. 420800 IN NS b.root-servers.net.
. 420800 IN NS h.root-servers.net.
. 420800 IN NS m.root-servers.net.
. 420800 IN NS f.root-servers.net.
. 420800 IN NS d.root-servers.net.
. 420800 IN NS i.root-servers.net.
;; Received 500 bytes from 192.168.21.254#53(192.168.21.254) in 70 ms

ip6.arpa. 172800 IN NS a.ip6-servers.arpa.
ip6.arpa. 172800 IN NS c.ip6-servers.arpa.
ip6.arpa. 172800 IN NS d.ip6-servers.arpa.
ip6.arpa. 172800 IN NS e.ip6-servers.arpa.
ip6.arpa. 172800 IN NS f.ip6-servers.arpa.
ip6.arpa. 172800 IN NS b.ip6-servers.arpa.
;; Received 462 bytes from 2001:dc3::35#53(2001:dc3::35) in 201 ms

8.2.0.0.0.1.6.2.ip6.arpa. 10800 IN NS reggae.ncren.net.
8.2.0.0.0.1.6.2.ip6.arpa. 10800 IN NS ncnoc.ncren.net.
;; Received 140 bytes from 202.12.29.59#53(202.12.29.59) in 270 ms

;; Received 90 bytes from 128.109.131.3#53(128.109.131.3) in 106 ms

We have our dns setup right, but it seems they are not delegating that reverse zone to us. Might need to ping them and get that (re) setup.