`relearn.cn`

DNSSEC	⚠️ Not signed
A	103.21.141.130^{🇨🇳 SHANGHAITELECOM103.21.140.0/23 SHIDC}
NS	`a.ezdnscenter.com` ⭐
		A	218.98.111.140^{🇩🇪 HKCICL-AS-AP218.98.111.0/24 HONG KONG COMMUNICATIONS INTERNATIONAL CO.,LIMITED}
NS	`b.ezdnscenter.com`
		A	183.253.57.210^{🇨🇳 CHINAMOBILE-CN183.253.0.0/16 CMI (Customer Route)}
		A	211.99.99.58^{🇨🇳 DONGGUAN-1211.99.99.0/24}
MX	`mx1.chengmail.cn` ⭐
		A	103.143.231.69^{🇭🇰 YISUCLOUDLTD-HK103.143.231.0/24 Hongkong Hongdou Technology Co., Limited FLAT/RM B07 23/F HOVER INDUSTRIAL BUILDING NO.26-38 KWAI CHEONG ROAO, NT}
		A	113.10.158.179^{🇭🇰 HKBNESL-AS-AP113.10.158.0/24 New World Telecommunications Limited Hong Kong Broadband Network Ltd 15/F, Trans Asia Centre 18 Kin Hong Street, Kwai Chung, N.T.}
			PTR	`113010158179.static.ctinets.com`
MX	`mx2.chengmail.cn`⁽²⁰⁾
		A	103.143.231.69^{🇭🇰 YISUCLOUDLTD-HK103.143.231.0/24 Hongkong Hongdou Technology Co., Limited FLAT/RM B07 23/F HOVER INDUSTRIAL BUILDING NO.26-38 KWAI CHEONG ROAO, NT}
		A	113.10.158.179^{🇭🇰 HKBNESL-AS-AP113.10.158.0/24 New World Telecommunications Limited Hong Kong Broadband Network Ltd 15/F, Trans Asia Centre 18 Kin Hong Street, Kwai Chung, N.T.}
			PTR	`113010158179.static.ctinets.com`
TXT	`v=spf1 include:spf.chengmail.cn ~all`
SOA	`a.ezdnscenter.com`dnsadmin@ezdnscenter.com serial=1751342668

`cn`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.dns.cn` ⭐
	NS	`b.dns.cn`
	NS	`c.dns.cn`
	NS	`d.dns.cn`
	NS	`e.dns.cn`
	NS	`ns.cernet.net` ⚠️ Not in parent delegation
	SOA	`a.dns.cn`root@cnnic.cn serial=2035107717

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DNS History

7 records (5 active, 2 former)

●NSa.ezdnscenter.com2017-08-31 → 2026-07-29 · 3 obs

○ 2015-10-28 18:05:08
● 2017-08-31 09:54:08
● 2026-07-29 22:00:38

●NSb.ezdnscenter.com2026-06-27 → 2026-07-29 · 3 obs

○ 2017-08-31 09:54:08
● 2026-06-27 06:18:46
● 2026-07-29 22:00:38

○NSdns13.hichina.com2015-06-13 → 2015-06-13 · 3 obs

● 2015-06-13 15:10:16
○ 2015-10-28 18:05:08
○ 2026-07-29 22:00:38

○NSdns14.hichina.com2015-06-13 → 2015-06-13 · 3 obs

● 2015-06-13 15:10:16
○ 2015-10-28 18:05:08
○ 2026-07-29 22:00:38

●MXmx1.chengmail.cn2017-08-31 → 2026-07-29 · 2 obs

● 2017-08-31 09:54:08
● 2026-07-29 22:00:38

●MXmx2.chengmail.cn2017-08-31 → 2026-07-29 · 2 obs

● 2017-08-31 09:54:08
● 2026-07-29 22:00:38

●A103.21.141.1302026-06-27 → 2026-07-29 · 2 obs

● 2026-06-27 06:18:46
● 2026-07-29 22:00:38

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cn	e.dns.cn, a.dns.cn, c.dns.cn, d.dns.cn...	-
relearn.cn	a.ezdnscenter.com, b.ezdnscenter.com	-

✅ Authoritative Response

Server:183.253.57.210

NS records: a.ezdnscenter.com, b.ezdnscenter.com

🔒 DNSSEC Status

❌ Bogus (DNSSEC validation failed)

Validation error at cn: Error: DNS query timeout: 203.119.29.1 for DNSKEY cn

⏱️ Timing

Total: 4743ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`103.21.141.130`
NS	2	`a.ezdnscenter.com, b.ezdnscenter.com`
MX	2	`mx1.chengmail.cn (pri: 10), mx2.chengmail.cn (pri: 20)`
TXT	1	`v=spf1 include:spf.chengmail.cn ~all`
SOA	1	`a.ezdnscenter.com dnsadmin.ezdnscenter.c`

Analysis

IP Addresses

relearn.cn resolves to one IP address: 103.21.141.130.

szinvent.com, fansigo.com, sig-sh.com and two other host names share IP numbers with relearn.cn.

Name Servers

Two name servers handle the delegation for relearn.cn: a.ezdnscenter.com and b.ezdnscenter.com.

relearn.cn uses the same name servers as several other domains — among them nektachina.com, daojishiwang.com, tscamps.com and two more.

relearn.cn is at least partially co-delegated on name servers with other domains, such as 5view.net.

Hostnames that resolve to two IP addresses:

b.ezdnscenter.com resolves to two addresses: 183.253.57.210 and 211.99.99.58.

Hosts with just one IP address:

The hostname a.ezdnscenter.com resolves to 218.98.111.140.

Mail Servers

Mail for relearn.cn is handled by two mail servers — mx1.chengmail.cn and mx2.chengmail.cn.

relearn.cn uses an identical mail server configuration to several other domains — among them wucarbon.com, weiermetal.com, pjnet.net and two more.

relearn.cn uses mail servers that are also used by other domains, including koziro.com, royallalex.com and g0000.com.

mx1.chengmail.cn and mx2.chengmail.cn each point to two IP numbers — 103.143.231.69 and 113.10.158.179 — making both hosts identical in their DNS resolution.

mx1.chengmail.cn along with mx2.chengmail.cn each resolve to 103.143.231.69 IP addresses.

mx1.chengmail.cn along with mx2.chengmail.cn each resolve to 113.10.158.179 IP addresses.

relearn.cn - robtex.com

relearn.cn

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