tutorialbook.co.kr - dns.ninja

`tutorialbook.co.kr`

DNSSEC	⚠️ Not signed
NS	`armfazh.ns.cloudflare.com` ⚠️ Not in zone NS records
		A	2606:4700:58::a29f:2c68^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`armfazh.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c368^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`armfazh.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2368^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`armfazh.ns.cloudflare.com`
		A	108.162.195.104^{🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`armfazh.ns.cloudflare.com`
		A	162.159.44.104^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`armfazh.ns.cloudflare.com`
		A	172.64.35.104^{🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`armfazh.ns.cloudflare.com`
NS	`serena.ns.cloudflare.com` ⚠️ Not in zone NS records
		A	2606:4700:50::adf5:3adc^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`serena.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c0dc^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`serena.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:20dc^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`serena.ns.cloudflare.com`
		A	108.162.192.220^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`serena.ns.cloudflare.com`
		A	172.64.32.220^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`serena.ns.cloudflare.com`
		A	173.245.58.220^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`serena.ns.cloudflare.com`

`co.kr`

	DNSSEC	⚠️ Not signed
	NS	`g.dns.kr` ⭐ ⚠️ Not in parent delegation
	NS	`b.dns.kr` ⚠️ Not in parent delegation
	NS	`c.dns.kr` ⚠️ Not in parent delegation
	NS	`d.dns.kr` ⚠️ Not in parent delegation
	NS	`e.dns.kr` ⚠️ Not in parent delegation
	NS	`f.dns.kr` ⚠️ Not in parent delegation
	SOA	`g.dns.kr`domain-manager@nic.or.kr serial=2608030513

WOT: UNKNOWN (62/100)

Same first word

tutorialbook.co.kr

DNS History

16 records (2 active, 14 former)

●NSarmfazh.ns.cloudflare.com2026-02-15 → 2026-08-03 · 3 obs

○ 2016-12-05 01:13:44
● 2026-02-15 18:15:44
● 2026-08-03 02:12:20

○NSns11.dnstool.net2016-12-05 → 2016-12-05 · 3 obs

● 2016-12-05 01:13:44
○ 2026-02-15 18:15:44
○ 2026-08-03 02:12:20

●NSserena.ns.cloudflare.com2026-02-15 → 2026-08-03 · 3 obs

○ 2016-12-05 01:13:44
● 2026-02-15 18:15:44
● 2026-08-03 02:12:20

○MXmx.ipage.com2016-12-05 → 2016-12-05 · 3 obs

● 2016-12-05 01:13:44
○ 2026-02-15 18:15:44
○ 2026-08-03 02:12:20

○MXmx.stackmail.com2026-02-15 → 2026-05-01 · 5 obs

○ 2016-12-05 01:13:44
● 2026-02-15 18:15:44
● 2026-05-01 06:49:24
○ 2026-06-26 15:33:50
○ 2026-08-03 02:12:20

○A104.21.31.1542026-02-15 → 2026-05-01 · 7 obs

○ 2016-12-05 01:13:44
● 2026-02-15 18:15:44
○ 2026-02-15 22:18:18
● 2026-03-24 05:42:16
● 2026-05-01 06:49:24
○ 2026-06-26 15:33:50
○ 2026-08-03 02:12:20

○A172.67.178.572026-02-15 → 2026-05-01 · 7 obs

○ 2016-12-05 01:13:44
● 2026-02-15 18:15:44
○ 2026-02-15 22:18:18
● 2026-03-24 05:42:16
● 2026-05-01 06:49:24
○ 2026-06-26 15:33:50
○ 2026-08-03 02:12:20

○A175.126.170.1102016-12-05 → 2016-12-05 · 3 obs

● 2016-12-05 01:13:44
○ 2026-02-15 18:15:44
○ 2026-08-03 02:12:20

○A175.126.170.702016-12-05 → 2016-12-05 · 3 obs

● 2016-12-05 01:13:44
○ 2026-02-15 18:15:44
○ 2026-08-03 02:12:20

○A188.114.96.02026-02-15 → 2026-02-15 · 4 obs

○ 2026-02-15 18:15:44
● 2026-02-15 22:18:18
○ 2026-03-24 05:42:16
○ 2026-08-03 02:12:20

○A188.114.97.02026-02-15 → 2026-02-15 · 4 obs

○ 2026-02-15 18:15:44
● 2026-02-15 22:18:18
○ 2026-03-24 05:42:16
○ 2026-08-03 02:12:20

○A2606:4700:3031::6815:1f9a2026-02-15 → 2026-05-01 · 7 obs

○ 2016-12-05 01:13:44
● 2026-02-15 18:15:44
○ 2026-02-15 22:18:18
● 2026-03-24 05:42:16
● 2026-05-01 06:49:24
○ 2026-06-26 15:33:50
○ 2026-08-03 02:12:20

○A2606:4700:3036::ac43:b2392026-02-15 → 2026-05-01 · 7 obs

○ 2016-12-05 01:13:44
● 2026-02-15 18:15:44
○ 2026-02-15 22:18:18
● 2026-03-24 05:42:16
● 2026-05-01 06:49:24
○ 2026-06-26 15:33:50
○ 2026-08-03 02:12:20

○A2a06:98c1:3120::2026-02-15 → 2026-02-15 · 4 obs

○ 2026-02-15 18:15:44
● 2026-02-15 22:18:18
○ 2026-03-24 05:42:16
○ 2026-08-03 02:12:20

○A2a06:98c1:3121::2026-02-15 → 2026-02-15 · 4 obs

○ 2026-02-15 18:15:44
● 2026-02-15 22:18:18
○ 2026-03-24 05:42:16
○ 2026-08-03 02:12:20

○CNAMEhost.tistory.io2016-12-05 → 2026-02-15 · 4 obs

● 2016-12-05 01:13:44
● 2026-02-15 22:18:18
○ 2026-03-24 05:42:16
○ 2026-08-03 02:12:20

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
kr	g.dns.kr, c.dns.kr, e.dns.kr, b.dns.kr...	-
tutorialbook.co.kr	serena.ns.cloudflare.com, armfazh.ns.cloudflare.com	-

✅ Authoritative Response

Server:173.245.58.220

NS records: serena.ns.cloudflare.com, armfazh.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for tutorialbook.co.kr (unsigned zone)

⏱️ Timing

Total: 882ms | Queries: -

📄 Records

Type	Count	Sample Data

Analysis

Name Servers

tutorialbook.co.kr has two authoritative name servers — armfazh.ns.cloudflare.com and serena.ns.cloudflare.com.

tutorialbook.co.kr has the same name server delegation as a number of other domains, such as mirchitech.com, ventilationssystem.se, boomsjans.nl and two more.

The name servers of tutorialbook.co.kr overlap at least partially with those of other domains — among them dmmp.co.uk, caledonlabs.ca, positive-outcome.space and two more.

These name servers commonly appear in combination with the name servers violet.ns.cloudflare.com.

Host names resolving to 6 IP numbers:

armfazh.ns.cloudflare.com points to 108.162.195.104, 162.159.44.104, 172.64.35.104 and 3 other IP addresses.

serena.ns.cloudflare.com points to 108.162.192.220, 172.64.32.220, 173.245.58.220 and 3 other IP addresses.