`mail.t-know.com`

CNAME	`exmail.qq.com`
DNSSEC	⚠️ Not signed
NS	`ns-cmn1.qq.com` ⚠️ Not in parent delegation
		A	2402:4e00:111:ff4::3^{🇨🇳 TENCENT-NET-AP2402:4e00::/35}
		A	42.187.235.2^{🇨🇳 TENCENT-NET-AP42.187.192.0/18 chinanet/CN2 TianJin province network}
		A	43.140.54.204^{🇨🇳 TENCENT-NET-AP43.140.0.0/18 Tencent Cloud Computing (Beijing) Co., Ltd 309 West Zone, 3F. 49 Zhichun Road. Haidian District.}
		A	43.142.212.27^{🇨🇳 TENCENT-NET-AP43.142.192.0/18}
NS	`ns-cnc1.qq.com` ⚠️ Not in parent delegation
		A	240e:e1:aa00:2002::3^{🇨🇳 SHANGHAITELECOM240e:e1:a000::/36 SHIDC}
		A	125.39.202.12^{🇨🇳 CHINA169-Backbone125.36.0.0/14 CNC Group CHINA169 Tianjin Province Network}
			PTR	`no-data`
		A	140.207.180.96^{🇨🇳 UNICOM-SHFT-IDC140.207.180.0/24 China Unicom B811&A1218, China Unicom No.21, Jin-Rong Street}
		A	157.255.6.102^{🇨🇳 UNICOM-GuangZhou-IDC157.255.6.0/24}
NS	`ns-os1.qq.com` ⚠️ Not in parent delegation
		A	2402:4e00:111:ff4::3^{🇨🇳 TENCENT-NET-AP2402:4e00::/35}
		A	43.129.131.16^{🇸🇬 TENCENT-NET-AP-CN43.129.128.0/20}
		A	43.130.172.23^{🇸🇬 TENCENT-NET-AP-CN43.130.160.0/19 ACEVILLE PTE.LTD. 16 COLLYER QUAY 18-29 INCOME AT RAFFLES}
		A	43.134.249.23^{🇸🇬 TENCENT-NET-AP-CN43.134.224.0/19 ACEVILLE PTE.LTD. 16 COLLYER QUAY 18-29 INCOME AT RAFFLES}
		A	43.159.167.10^{🇺🇸 TENCENT-NET-AP-CN43.159.160.0/19 ACEVILLE PTE.LTD. 16 COLLYER QUAY 18-29 INCOME AT RAFFLES}
		A	43.159.167.133^{🇺🇸 TENCENT-NET-AP-CN43.159.160.0/19 ACEVILLE PTE.LTD. 16 COLLYER QUAY 18-29 INCOME AT RAFFLES}
		A	43.166.55.3^{🇸🇬 TENCENT-NET-AP-CN43.166.0.0/18 ACEVILLE PTE.LTD. 16 COLLYER QUAY 18-29 INCOME AT RAFFLES}
		A	49.51.76.46^{🇺🇸 TENCENT-NET-AP-CN49.51.76.0/23 Proxy-registered route object}
		A	170.106.32.16^{🇺🇸 TENCENT-NET-AP-CN170.106.32.0/22 Proxy-registered route object}
		A	203.205.220.26^{🇭🇰 TENCENT-NET-AP-CN203.205.220.0/23 Proxy-registered route object}
NS	`ns-tel1.qq.com` ⚠️ Not in parent delegation
		A	240e:e1:aa00:2002::3^{🇨🇳 SHANGHAITELECOM240e:e1:a000::/36 SHIDC}
		A	14.116.238.220^{🇨🇳 CHINANET-BACKBONE14.112.0.0/12 China Telecom Network}
		A	49.7.250.139^{🇨🇳 CHINA-149.7.192.0/18 China Telecom Beijing Co. Ltd.}
		A	101.227.161.254^{🇨🇳 SHANGHAITELECOM101.227.161.0/24 SHIDC}

`t-know.com`

	DNSSEC	⚠️ Not signed
	NS	`dns9.hichina.com` ⭐
	NS	`dns10.hichina.com`
	MX	`mx1.feishu.cn` ⭐
	MX	`mx2.feishu.cn`⁽⁵⁾
	MX	`mx3.feishu.cn`⁽¹⁰⁾
	TXT	`v=spf1 +include:_netblocks.m.feishu.cn -all`
	TXT	`verification-code-site-App_feishu=uUDi9IgZ9nX8sZJ4pwG2`
	SOA	`dns9.hichina.com`hostmaster@hichina.com 2026-01-12 #9

WOT: SAFE (60/100)

Previously MX for

t-know.com

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DNS History

3 records (1 active, 2 former)

○A127.0.0.12015-08-28 → 2015-08-28 · 3 obs

● 2015-08-28 22:15:12
○ 2015-09-30 18:55:04
○ 2026-03-28 06:22:48

○A185.67.158.1442015-09-30 → 2018-03-04 · 5 obs

○ 2015-08-28 22:15:12
● 2015-09-30 18:55:04
● 2018-03-04 03:49:08
○ 2026-03-23 19:01:20
○ 2026-03-28 06:22:48

●CNAMEexmail.qq.com2026-03-23 → 2026-03-28 · 2 obs

● 2026-03-23 19:01:20
● 2026-03-28 06:22:48

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
t-know.com	dns9.hichina.com, dns10.hichina.com	18 records

✅ Authoritative Response

Server:120.76.107.41

NS records: dns9.hichina.com, dns10.hichina.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for t-know.com (unsigned zone)

⏱️ Timing

Total: 3596ms | Queries: -

📄 Records

Type	Count	Sample Data
CNAME	1	`exmail.qq.com`

📌 Glue Records Collected

Total: 18

Out-of-bailiwick: 18 (dns9.hichina.com, dns9.hichina.com, dns9.hichina.com...)

Analysis

Name Servers

mail.t-know.com delegates to four name servers: ns-cmn1.qq.com, ns-cnc1.qq.com, ns-os1.qq.com and ns-tel1.qq.com.

mail.t-know.com at least partially shares name servers with other domains, including adobe-dns-3144190266.qzone.qq.com, sz6.tencent.com, qqspace-av.qq.com, splashnews.gtimg.com and mxblz2.qq.com.

These name servers are commonly used with ns-open1.qq.com, ns-open2.qq.com and ns-open3.qq.com.

Host names with ten IP numbers:

Host name ns-os1.qq.com points to 2402:4e00:111:ff4::3, 43.129.131.16, 43.130.172.23, 43.134.249.23, 43.159.167.10, 43.159.167.133, 43.166.55.3, 49.51.76.46, 170.106.32.16 and 203.205.220.26.

Host names with four IP numbers:

Host name ns-cmn1.qq.com points to 2402:4e00:111:ff4::3, 42.187.235.2, 43.140.54.204 and 43.142.212.27.

Host name ns-cnc1.qq.com points to 240e:e1:aa00:2002::3, 125.39.202.12, 140.207.180.96 and 157.255.6.102.

Host name ns-tel1.qq.com points to 240e:e1:aa00:2002::3, 14.116.238.220, 49.7.250.139 and 101.227.161.254.

Host names that point to 2402:4e00:111:ff4::3: ns-os1.qq.com and ns-cmn1.qq.com.

Host names that point to 240e:e1:aa00:2002::3: ns-cnc1.qq.com and ns-tel1.qq.com.

mail.t-know.com - robtex.com

mail.t-know.com

t-know.com