`mail.zhenghai.com`

	DNSSEC	⚠️ Not signed
	A	218.56.33.236^{🇨🇳 CHINA169-Backbone218.56.0.0/15 CMI (Customer Route)}

`zhenghai.com`

	DNSSEC	⚠️ Not signed
	A	47.105.98.95^{🇨🇳 Alibaba-Cloud47.105.0.0/16}
	NS	`ns1.dnsv4.com` ⭐
	NS	`ns2.dnsv4.com`
	MX	`zhbio-com.corpsmtp.net` ⭐
	MX	`zhbio-com.corpsmtp.cn`⁽¹⁰⁾
	MX	`cnc.biz-email.net`⁽¹⁵⁾
	MX	`mail.biz-email.net`⁽²⁰⁾
	TXT	`v=spf1 include:spf.corp-email.com include:spfb.corp-email.com ~all`
	TXT	`848178259-212739694`
	SOA	`ns1.dnsv4.com`enterprise2dnsadmin@dnspod.com serial=1782694464

PTR for

90.17.57.58.in-addr.arpa

Previously MX for

zhenghai.com

Same first word

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DNS History

1 record (1 active, 0 former)

●A218.56.33.2362015-07-07 → 2026-07-27 · 2 obs

● 2015-07-07 09:03:42
● 2026-07-27 12:54:16

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	b.gtld-servers.net, a.gtld-servers.net, d.gtld-servers.net, c.gtld-servers.net...	-
zhenghai.com	ns1.dnsv4.com, ns2.dnsv4.com	15 records

✅ Authoritative Response

Server:1.12.0.23

NS records: ns1.dnsv4.com, ns2.dnsv4.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for zhenghai.com (unsigned zone)

⏱️ Timing

Total: 380ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`218.56.33.236`

📌 Glue Records Collected

Total: 15

Out-of-bailiwick: 15 (ns1.dnsv4.com, ns1.dnsv4.com, ns1.dnsv4.com...)

Analysis

IP Addresses

mail.zhenghai.com resolves to one IP address: 218.56.33.236.

Host names like mail01.zhmag.com are further examples that share IP numbers with mail.zhenghai.com.

mail.zhenghai.com - robtex.com