`21book.cn`

DNSSEC	⚠️ Not signed
A	208.98.40.207^{🇺🇸 SHARKTECH-1}
NS	`www.21book.cn` ⭐
		A	208.98.40.21^{🇺🇸 SHARKTECH-1}
NS	`ns1.4.cn` ⚠️ Not in zone NS records
		A	107.167.27.66^{🇺🇸 SHARKTECH-1}
NS	`ns2.4.cn` ⚠️ Not in zone NS records
		A	64.32.10.2^{🇺🇸 SHARKTECH-1}
			PTR	`ip-64-32-10-2.defastlink.net`
SOA	`www.21book.cn`21book@cn 2008-08-03 #0

`cn`

	DNSSEC	⚠️ Not signed
	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=2034456417

Same first word

21book.com

Similar names

12book.club

book12.com

book21.co.kr

12book.com

12book.de

12book.com.bn

DNS History

10 records (4 active, 6 former)

●NSns1.4.cn2026-02-24 → 2026-02-24 · 2 obs

○ 2015-06-23 16:23:52
● 2026-02-24 14:23:10

●NSns2.4.cn2026-02-24 → 2026-02-24 · 2 obs

○ 2015-06-23 16:23:52
● 2026-02-24 14:23:10

●NSwww.21book.cn2015-06-23 → 2026-02-24 · 2 obs

● 2015-06-23 16:23:52
● 2026-02-24 14:23:10

○MXio.bouncemx.com2015-11-06 → 2016-06-18 · 3 obs

● 2015-11-06 03:30:22
● 2016-06-18 03:12:26
○ 2026-02-24 14:23:10

●A208.98.40.2072026-02-24 → 2026-02-24 · 2 obs

○ 2016-06-18 03:12:26
● 2026-02-24 14:23:10

○A70.39.84.2322015-11-06 → 2015-11-06 · 4 obs

○ 2015-06-23 16:23:52
● 2015-11-06 03:30:22
○ 2016-02-27 10:06:14
○ 2026-02-24 14:23:10

○A70.39.84.2402016-02-27 → 2016-02-27 · 4 obs

○ 2015-11-06 03:30:22
● 2016-02-27 10:06:14
○ 2016-06-18 03:12:26
○ 2026-02-24 14:23:10

○A70.39.84.2422016-06-18 → 2016-06-18 · 3 obs

○ 2016-02-27 10:06:14
● 2016-06-18 03:12:26
○ 2026-02-24 14:23:10

○A70.39.84.2462015-06-23 → 2015-06-23 · 2 obs

● 2015-06-23 16:23:52
○ 2026-02-24 14:23:10

○CNAMEnum2.dcoin.co2015-06-23 → 2016-06-18 · 3 obs

● 2015-06-23 16:23:52
● 2016-06-18 03:12:26
○ 2026-02-24 14:23:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
21book.cn	ns1.4.cn, ns2.4.cn	-

✅ Authoritative Response

Server: 107.167.27.66

NS records: ns1.4.cn, ns2.4.cn

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 21book.cn (unsigned zone)

⏱️ Timing

Total: 127ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`208.98.40.207`
SOA	1	`www.21book.cn 21book.cn`

AI analysis

21book.cn resolves to one IP number: 208.98.40.207.

Other host names, for instance www.3452.cc, www.www.www.www.bdwww.com, www.chungoi.net, www.www.goupigaoyao.com and gubi.cn share IP numbers with 21book.cn.

21book.cn is delegated to three name servers: www.21book.cn, ns1.4.cn and ns2.4.cn.

21book.cn at least partially shares name servers with other domains, including rb44.com, cook5.com, 073000.com, kx1111.com and huguan.com.cn.

These name servers are commonly used with ns3.goldenname.com, ns4.goldenname.com, www.rb44.com, www.cook5.com, www.073000.com and www.kx1111.com.

Host names with a single IP:

www.21book.cn points to 208.98.40.21; ns1.4.cn points to 107.167.27.66; ns2.4.cn points to 64.32.10.2.

21book.cn - robtex.com

21book.cn

cn