`mail.letterbox.jp`

DNSSEC	⚠️ Not signed
A	160.251.151.197^{🇯🇵 GMOOSK-NET160.251.151.0/24 GMO Internet,Inc Cerulean Tower, 11F Sakuragaokacho-26-1 Shibuya-ku, Tokyo 150-8512, Japan}
		PTR	`m2.xrea.com`

`letterbox.jp`

	DNSSEC	⚠️ Not signed
	NS	`ns11.value-domain.com` ⭐ ⚠️ Not in parent delegation
	NS	`ns1.value-domain.com` ⚠️ Not in zone NS records
	NS	`ns12.value-domain.com` ⚠️ Not in zone NS records
	NS	`ns13.value-domain.com` ⚠️ Not in zone NS records
	NS	`ns2.value-domain.com` ⚠️ Not in parent delegation
	MX	`mail.letterbox.jp` ⭐
	TXT	`v=spf1 a:letterbox.jp ~all`
	SOA	`ns1.value-domain.com`hostmaster@letterbox.jp 2020-08-26 #23

MX for

letterbox.jp

Same first word

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DNS History

2 records (1 active, 1 former)

●A160.251.151.1972026-04-11 → 2026-05-14 · 3 obs

○ 2016-06-23 17:59:26
● 2026-04-11 01:45:22
● 2026-05-14 06:49:00

○A203.189.104.1912015-07-26 → 2016-06-23 · 4 obs

● 2015-07-26 13:42:52
● 2016-06-23 17:59:26
○ 2026-04-11 01:45:22
○ 2026-05-14 06:49:00

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
jp	a.dns.jp, b.dns.jp, c.dns.jp, d.dns.jp...	-
letterbox.jp	ns11.value-domain.com, ns12.value-domain.com, ns13.value-domain.com	-

✅ Authoritative Response

Server:172.64.52.184

NS records: ns11.value-domain.com, ns12.value-domain.com, ns13.value-domain.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for letterbox.jp (unsigned zone)

⏱️ Timing

Total: 2644ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`160.251.151.197`

Analysis

Mail Server Role

mail.letterbox.jp serves as the mail server for letterbox.jp.

IP Addresses

mail.letterbox.jp points to a single IP: 160.251.151.197.

Other host names, for instance zero-mail.net, mailhost.tocchi.net, mori(0x73686974)a.org, hostmaster.nakashima-k.com and mail.m2.xrea.com share IP numbers with mail.letterbox.jp.

mail.letterbox.jp - robtex.com