plala.jp.		30 IN SOA ddns.plala.or.jp. postmaster.plala.or.jp. (
				11011906   ; serial
				7200       ; refresh (2 hours)
				1800       ; retry (30 minutes)
				1209600    ; expire (2 weeks)
				600        ; minimum (10 minutes)
				)

Name servers:
plala.jp.		30 IN NS ddns-v1.plala.jp.
plala.jp.		30 IN NS ddns-s1.plala.jp.