`mail.rationalu.com`

DNSSEC	⚠️ Not signed
A	47.254.92.90^{🇺🇸 Alibaba-Cloud47.254.64.0/18 Proxy-registered route object}
		PTR	`ninisilk.com`
		PTR	`new.showcloud.top`

`rationalu.com`

	DNSSEC	⚠️ Not signed
	A	18.116.229.94^{🇺🇸 Amazon18.116.0.0/14 EC2 CMH Prefix}
	NS	`dns15.hichina.com` ⭐
	NS	`dns16.hichina.com`
	MX	`mail.rationalu.com` ⭐
	TXT	`v=spf1 ip4:47.254.92.90~all`
	SOA	`dns15.hichina.com`hostmaster@hichina.com 2026-01-09 #13

⚠️ On DNS blocklist: tif

MX for

rationalu.com

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DNS History

1 record (1 active, 0 former)

●A47.254.92.902026-03-25 → 2026-03-25 · 2 obs

● 2026-03-25 21:16:42
● 2026-03-25 23:30:18

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
rationalu.com	dns15.hichina.com, dns16.hichina.com	18 records

✅ Authoritative Response

Server:120.76.107.42

NS records: dns15.hichina.com, dns16.hichina.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for rationalu.com (unsigned zone)

⏱️ Timing

Total: 2535ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`47.254.92.90`

📌 Glue Records Collected

Total: 18

Out-of-bailiwick: 18 (dns15.hichina.com, dns15.hichina.com, dns15.hichina.com...)

Analysis

Mail Server Role

mail.rationalu.com is the mail server for rationalu.com.

IP Addresses

mail.rationalu.com resolves to one IP number: 47.254.92.90.

other host names including mail.ustercoach.com, mail.geometricy.com, mail.criteriont.com, mail.approachee.com and mail.extendexpand.com share IP numbers with mail.rationalu.com.

mail.rationalu.com - robtex.com