city.iwamizawa.hokkaido.jp	IN	MX	mail1.city.iwamizawa.hokkaido.jp
city.iwamizawa.hokkaido.jp	IN	MX	mail2.city.iwamizawa.hokkaido.jp
city.iwamizawa.hokkaido.jp	IN	NS	dns-b.iij.ad.jp
city.iwamizawa.hokkaido.jp	IN	NS	dns-c.iij.ad.jp