ALLOCATED - delegated entirely to specific RIR (Regional Internet Registry) as indicated.
203.0.113.0/24 reserved for TEST-NET-3 [RFC5737]. Complete registration details for 203.0.113.0/24 are found in [IANA registry iana-ipv4-special-registry].
mail.yukiwa.co.jp DNS Resource Records
In this section you will find important DNS resource records for mail.yukiwa.co.jp. SOA records, Name Server records, and MX records are included when available. Additional supporting data includes serial numbers, refresh rates, retry times, TTL, priority, and length to expire will be shown.