`srv3.omusan.com`

DNSSEC	⚠️ Not signed
A	133.242.133.40^{🇯🇵 SAKURA-A133.242.0.0/16 (1/ISHIKARI) SAKURA Internet // HOKKAIDO BACKBONE 1-8-14 Minami-Honmachi, Chuo-ku, Osaka 541-0054, Japan}
		PTR	`srv3.omusan.com`

`omusan.com`

	DNSSEC	⚠️ Not signed
	A	153.127.18.143^{🇯🇵 SAKURA-A153.127.0.0/17 (ISHIKARI) SAKURA Internet // HOKKAIDO JAPAN BACKBONE Sakaisuji Honmachi Bldg. 9F 1-8-14 Minami-Honmachi, Chuo-ku Osaka 541-0054, Japan}
	NS	`master.dns.ne.jp` ⭐
	NS	`ns1.dns.ne.jp`
	NS	`ns2.dns.ne.jp`
	MX	`mail3.omusan.com` ⭐
	TXT	`v=spf1 +ip4:153.127.18.143 +ip4:133.242.133.40 -all`
	SOA	`master.dns.ne.jp`tech@sakura.ad.jp 2026-04-24 #1

PTR for

40.133.242.133.in-addr.arpa

Same first word

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🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
omusan.com	ns1.dns.ne.jp, ns2.dns.ne.jp	-

✅ Authoritative Response

Server:61.211.236.1

NS records: ns1.dns.ne.jp, ns2.dns.ne.jp

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for omusan.com (unsigned zone)

⏱️ Timing

Total: 1021ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`133.242.133.40`

Analysis

IP Addresses

srv3.omusan.com has exactly one IP address — 133.242.133.40.

Host names such as mail3.omusan.com and mail.omusan.com share IP numbers with srv3.omusan.com.

srv3.omusan.com - robtex.com

srv3.omusan.com

omusan.com