`mail.first-roof.com`

	DNSSEC	⚠️ Not signed
	A	203.183.70.243^{🇯🇵 IDC203.183.64.0/19 Frontier Inc.}

`first-roof.com`

	DNSSEC	⚠️ Not signed
	A	203.183.70.243^{🇯🇵 IDC203.183.64.0/19 Frontier Inc.}
	NS	`01.dnsv.jp` ⭐
	NS	`02.dnsv.jp`
	NS	`03.dnsv.jp`
	NS	`04.dnsv.jp`
	MX	`mail.first-roof.com` ⭐
	TXT	`v=spf1 +a +mx +a:sv01.icu.co.jp -all`
	SOA	`01.dnsv.jp`hostmaster@dnsv.jp serial=1721787609

MX for

first-roof.com

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DNS History

1 record (1 active, 0 former)

●A203.183.70.2432026-02-20 → 2026-04-14 · 2 obs

● 2026-02-20 05:43:26
● 2026-04-14 04:25:58

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
first-roof.com	01.dnsv.jp, 02.dnsv.jp, 03.dnsv.jp, 04.dnsv.jp	-

✅ Authoritative Response

Server:157.7.32.53

NS records: 01.dnsv.jp, 02.dnsv.jp, 03.dnsv.jp, 04.dnsv.jp

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for first-roof.com (unsigned zone)

⏱️ Timing

Total: 544ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`203.183.70.243`

Analysis

Mail Server Role

mail.first-roof.com serves as the mail server for first-roof.com.

IP Addresses

mail.first-roof.com points to a single IP: 203.183.70.243.

Other host names, for instance mist-m.com, mail.ujiden-net.co.jp, mail.hokuryo-kg.com, mail.kochiben.or.jp and ujiden-net.co.jp share IP numbers with mail.first-roof.com.

mail.first-roof.com - robtex.com