Pourtant...

moomoo@k2 ~ % dig ac       

; <<>> DiG 9.4.2-P2 <<>> ac
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57494
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;ac.				IN	A

;; ANSWER SECTION:
ac.			85558	IN	A	80.249.100.35

;; Query time: 2 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Nov 24 01:30:04 2008
;; MSG SIZE  rcvd: 36

moomoo@k2 ~ % nmap ac

Starting Nmap 4.68 ( http://nmap.org ) at 2008-11-24 01:30 CET
mass_dns: warning: Unable to determine any DNS servers. Reverse DNS is disabled. Try using --system-dns or specify valid servers with --dns-servers
Interesting ports on 80.249.100.35:
Not shown: 1022 filtered ports, 691 closed ports
PORT    STATE SERVICE
80/tcp  open  http
443/tcp open  https

Nmap done: 1 IP address (1 host up) scanned in 306.108 seconds

Et quand je clique sur le lien donné plus haut, j'obtiens bien un site web. Donc, je maintiens, je pense plutôt qu'il y a un bug chez toi.