`mail-officeonsa.com`

	DNSSEC	⚠️ Not signed
	A	175.28.4.4
	NS	`ns1.xtwo.ne.jp` ⭐
	NS	`ns2.xtwo.ne.jp`
	NS	`ns3.xtwo.ne.jp`
	MX	`mail.protonmail.ch` ⭐
	MX	`mailsec.protonmail.ch`⁽²⁰⁾
	TXT	`v=spf1 +a:sv3.xtwo.ne.jp +a:mail-officeonsa.com +mx include:spf.sender.xserve...`
	TXT	`protonmail-verification=d7901edc10802297aa3d99d1cee248eb4342f0a8`
	SOA	`ns1.xtwo.ne.jp`root@xtwo.ne.jp serial=0

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1777360791

Subdomains

www.mail-officeonsa.com

Same first word

mail-officeonsa.com

DNS History

6 records (6 active, 0 former)

●NSns1.xtwo.ne.jp2026-04-15 → 2026-04-28 · 2 obs

● 2026-04-15 03:02:40
● 2026-04-28 07:29:12

●NSns2.xtwo.ne.jp2026-04-15 → 2026-04-28 · 2 obs

● 2026-04-15 03:02:40
● 2026-04-28 07:29:12

●NSns3.xtwo.ne.jp2026-04-15 → 2026-04-28 · 2 obs

● 2026-04-15 03:02:40
● 2026-04-28 07:29:12

●MXmail.protonmail.ch2026-04-15 → 2026-04-28 · 2 obs

● 2026-04-15 03:02:40
● 2026-04-28 07:29:12

●MXmailsec.protonmail.ch2026-04-15 → 2026-04-28 · 2 obs

● 2026-04-15 03:02:40
● 2026-04-28 07:29:12

●A175.28.4.42026-04-15 → 2026-04-28 · 2 obs

● 2026-04-15 03:02:40
● 2026-04-28 07:29:12

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
mail-officeonsa.com	ns1.xtwo.ne.jp, ns2.xtwo.ne.jp, ns3.xtwo.ne.jp	-

✅ Authoritative Response

Server:202.226.37.251

NS records: ns1.xtwo.ne.jp, ns2.xtwo.ne.jp, ns3.xtwo.ne.jp

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for mail-officeonsa.com (unsigned zone)

⏱️ Timing

Total: 2351ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`175.28.4.4`
NS	3	`ns3.xtwo.ne.jp, ns1.xtwo.ne.jp...`
MX	2	`mail.protonmail.ch (pri: 10), mailsec.protonmail.ch (pri: 20)`
TXT	2	`protonmail-verification=d7901edc10802297, v=spf1 +a:sv3.xtwo.ne.jp +a:mail-officeo`
SOA	1	`ns1.xtwo.ne.jp root.xtwo.ne.jp`

Analysis

Hierarchy

mail-officeonsa.com is the parent of www.mail-officeonsa.com.

IP Addresses

mail-officeonsa.com resolves to one IP number: 175.28.4.4.

Name Servers

mail-officeonsa.com is delegated to three name servers ns1.xtwo.ne.jp, ns2.xtwo.ne.jp and ns3.xtwo.ne.jp.

Mail Servers

Two mail servers handle mail-officeonsa.com: mail.protonmail.ch and mailsec.protonmail.ch.

mail-officeonsa.com - robtex.com