`mail.blueline21.com`

DNSSEC	⚠️ Not signed
A	157.112.189.42^{🇯🇵 XSERVER-AS157.112.184.0/21 XSERVER Inc.}
		PTR	`sv1041.xserver.jp`

`blueline21.com`

	DNSSEC	⚠️ Not signed
	A	157.112.189.42^{🇯🇵 XSERVER-AS157.112.184.0/21 XSERVER Inc.}
	NS	`ns1.xserver.jp` ⭐
	NS	`ns2.xserver.jp`
	NS	`ns3.xserver.jp`
	NS	`ns4.xserver.jp`
	NS	`ns5.xserver.jp`
	MX	`blueline21.com` ⭐
	TXT	`v=spf1 +a:sv1041.xserver.jp +a:blueline21.com +mx include:spf.sender.xserver....`
	SOA	`ns1.xserver.jp`root@xserver.jp serial=0

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DNS History

1 record (1 active, 0 former)

●A157.112.189.422026-02-24 → 2026-03-31 · 2 obs

● 2026-02-24 20:19:40
● 2026-03-31 04:51:28

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	k.gtld-servers.net, a.gtld-servers.net, g.gtld-servers.net, b.gtld-servers.net...	-
blueline21.com	ns1.xserver.jp, ns2.xserver.jp, ns3.xserver.jp, ns4.xserver.jp...	-

✅ Authoritative Response

Server:202.226.36.247

NS records: ns1.xserver.jp, ns2.xserver.jp, ns3.xserver.jp, ns4.xserver.jp, ns5.xserver.jp

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for blueline21.com (unsigned zone)

⏱️ Timing

Total: 958ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`157.112.189.42`

Analysis

IP Addresses

mail.blueline21.com resolves to one IP number: 157.112.189.42.

other host names including pc7.co, ns.for-life.net, asiagap.jp, mail.dougu.info and mmd-it.com share IP numbers with mail.blueline21.com.

mail.blueline21.com - robtex.com