`knowoffice.com`

DNSSEC	⚠️ Not signed
NS	`ns1.22.cn` ⭐
		A	2001:df2:f080:1::5^{🇭🇰 HKCICL-AS-AP2001:df2:f080::/48 HONG KONG COMMUNICATIONS INTERNATIONAL CO.,LIMITED}
		A	61.158.128.10^{🇨🇳 CHINA169-Backbone61.158.128.0/17 CNC Group CHINA169 Henan Province Network}
			PTR	`10.128.158.61.ha.cnc`
		A	218.98.111.136^{🇩🇪 HKCICL-AS-AP218.98.111.0/24 HONG KONG COMMUNICATIONS INTERNATIONAL CO.,LIMITED}
NS	`ns2.22.cn`
		A	240e:97d:10:1402:0:1:0:1002^{🇨🇳 CHINANET-Guangdong-DongGuan-IDC240e:97d::/36 DongGuan IDC Network}
		A	1.193.216.203^{🇨🇳 CHINANET-Henan-Luoyang-IDC1.193.216.0/24 Chinatelecom HeNan Province Network}
		A	183.253.57.207^{🇨🇳 CHINAMOBILE-CN183.253.0.0/16 CMI (Customer Route)}
		A	211.99.99.61^{🇨🇳 DONGGUAN-1211.99.99.0/24 Proxy-registered route object}
SOA	`ns1.22.cn`dnsadmin@22.cn serial=1751342704

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1774607892

Same first word

knowoffice.com

DNS History

9 records (2 active, 7 former)

●NSns1.22.cn2026-02-18 → 2026-03-27 · 3 obs

○ 2019-01-13 00:01:40
● 2026-02-18 02:30:24
● 2026-03-27 11:05:56

○NSns1.bodis.com2015-08-20 → 2016-03-26 · 4 obs

● 2015-08-20 19:13:10
● 2016-03-26 05:46:32
○ 2017-02-05 19:52:18
○ 2026-03-27 11:05:56

○NSns1626.ztomy.com2017-02-05 → 2017-02-05 · 4 obs

○ 2016-03-26 05:46:32
● 2017-02-05 19:52:18
○ 2019-01-13 00:01:40
○ 2026-03-27 11:05:56

●NSns2.22.cn2026-02-18 → 2026-03-27 · 3 obs

○ 2019-01-13 00:01:40
● 2026-02-18 02:30:24
● 2026-03-27 11:05:56

○NSns2.bodis.com2015-08-20 → 2016-03-26 · 4 obs

● 2015-08-20 19:13:10
● 2016-03-26 05:46:32
○ 2017-02-05 19:52:18
○ 2026-03-27 11:05:56

○NSns2626.ztomy.com2017-02-05 → 2017-02-05 · 4 obs

○ 2016-03-26 05:46:32
● 2017-02-05 19:52:18
○ 2019-01-13 00:01:40
○ 2026-03-27 11:05:56

○A199.59.243.1202015-08-20 → 2016-03-26 · 4 obs

● 2015-08-20 19:13:10
● 2016-03-26 05:46:32
○ 2017-02-05 19:52:18
○ 2026-03-27 11:05:56

○A204.11.56.482017-02-05 → 2017-02-05 · 4 obs

○ 2016-03-26 05:46:32
● 2017-02-05 19:52:18
○ 2019-01-13 00:01:40
○ 2026-03-27 11:05:56

○PTRns1626.ztomy.com2017-02-05 → 2017-02-05 · 3 obs

● 2017-02-05 19:52:18
○ 2019-01-13 00:01:40
○ 2026-03-27 11:05:56

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...	-
knowoffice.com	ns2.22.cn, ns1.22.cn	-

✅ Authoritative Response

Server:183.253.57.207

NS records: ns2.22.cn, ns1.22.cn

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for knowoffice.com (unsigned zone)

⏱️ Timing

Total: 4222ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	2	`ns1.22.cn, ns2.22.cn`
SOA	1	`ns1.22.cn dnsadmin.22.cn`

Analysis

Name Servers

knowoffice.com is delegated to two name servers ns1.22.cn and ns2.22.cn.

knowoffice.com shares the same name server setup as other domains, for instance zjgkbbb.cn, tbsolar.com, ngzs.com, sxjxr.com and wanzhan.net.

Host names with four IP numbers: The host name ns2.22.cn points to 240e:97d:10:1402:0:1:0:1002, 1.193.216.203, 183.253.57.207 and 211.99.99.61.

Host names with three IP numbers: The host name ns1.22.cn points to 2001:df2:f080:1::5, 61.158.128.10 and 218.98.111.136.

knowoffice.com - robtex.com

knowoffice.com

com

Same first word

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

Analysis

Name Servers

`knowoffice.com`

`com`