Начни с наведения порядка в DNS:
1.
$ host 109.95.208.165
165.208.95.109.in-addr.arpa domain name pointer
www.colocat.ru
$ host
www.colocat.ru
www.colocat.ru has address 109.95.208.164
2.
$ host 94.228.168.67
67.168.228.94.in-addr.arpa domain name pointer mail.colocat.ru.
$ host mail.colocat.ru
mail.colocat.ru has address 109.95.208.165
