たしか６月６に確認した時はサーバのＩＰアドレス１個だったんですけど、
今見ると

> www.fifatickets.com
Server: 127.0.0.1
Address: 127.0.0.1#53

Non-authoritative answer:
Name: www.fifatickets.com
Address: 202.234.158.33
Name: www.fifatickets.com
Address: 202.234.158.49
Name: www.fifatickets.com
Address: 202.234.158.66

202.234.158.33　　202.234.158.49　　202.234.158.66 の３つに増えてますね

> set type=soa
> www.fifatickets.com
Server: 127.0.0.1
Address: 127.0.0.1#53

Non-authoritative answer:
*** Can't find www.fifatickets.com: No answer

Authoritative answers can be found from:
fifatickets.com
origin = ns01.cwidc.net.
mail addr = dns-support.cwidc.net.
serial = 2002060807
refresh = 10800
retry = 1800
expire = 3600000
minimum = 7200


serial = 2002060807　ですから、２００２年６月８日　７番目の更新のようですから、今日（６／８）増やしたのかな