`duelingbook.com`

DNSSEC	⚠️ Not signed
A	2606:4700:20::681a:cd2^{🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:20::681a:dd2^{🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:20::ac43:477b^{🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.26.12.210^{Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.26.13.210^{Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.71.123^{🇺🇸 Cloudflare172.67.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`coco.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a68^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`coco.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c068^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`coco.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2068^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`coco.ns.cloudflare.com`
		A	108.162.192.104^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`coco.ns.cloudflare.com`
		A	172.64.32.104^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`coco.ns.cloudflare.com`
		A	173.245.58.104^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`coco.ns.cloudflare.com`
NS	`tony.ns.cloudflare.com`
		A	2606:4700:58::adf5:3bf0^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tony.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1f0^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`tony.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21f0^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`tony.ns.cloudflare.com`
		A	108.162.193.240^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tony.ns.cloudflare.com`
		A	172.64.33.240^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tony.ns.cloudflare.com`
		A	173.245.59.240^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`tony.ns.cloudflare.com`
MX	`master.duelingbook.com` ⭐
		A	176.123.9.3^{🇲🇩 AlexHost176.123.9.0/24 -176.123.9/24}
			PTR	`master.duelingbook.com`
TXT	`google-site-verification=jcon59ZdTQB1lyUoc337ymu9t-j-tEFYeYauwDa7P2w`
TXT	`v=spf1 include:_spf.mailersend.net ip4:176.123.9.3 +a +mx +ip4:176.123.9.247 ...`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4	104.26.12.210, 104.26.13.210, 172.67.71.123
		IPv6	2606:4700:20::681a:cd2, 2606:4700:20::681a:dd2, 2606:4700:20::ac43:477b
SOA	`coco.ns.cloudflare.com`dns@cloudflare.com serial=2397976146

`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=1771291435

📈 Tranco rank: #194,518

Previously MX for

www.duelingbook.com

duelingbook.com

Subdomains

duel.duelingbook.com

server.duelingbook.com

www.duelingbook.com

master.duelingbook.com

Same first word

duelingbook.com

DNS History

13 records (9 active, 4 former)

●NScoco.ns.cloudflare.com2026-02-16 → 2026-03-03 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-03 21:05:14

○NSns1.duelingbook.com2016-12-21 → 2016-12-21 · 3 obs

● 2016-12-21 06:22:46
○ 2026-02-16 03:42:14
○ 2026-03-03 21:05:14

○NSns2.duelingbook.com2016-12-21 → 2016-12-21 · 3 obs

● 2016-12-21 06:22:46
○ 2026-02-16 03:42:14
○ 2026-03-03 21:05:14

●NStony.ns.cloudflare.com2026-02-16 → 2026-03-03 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-03 21:05:14

○MXduelingbook.com2016-12-21 → 2016-12-21 · 3 obs

● 2016-12-21 06:22:46
○ 2026-02-16 03:42:14
○ 2026-03-03 21:05:14

●MXmaster.duelingbook.com2026-02-16 → 2026-03-03 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-03 21:05:14

●A104.26.12.2102026-02-16 → 2026-03-03 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-03 21:05:14

●A104.26.13.2102026-02-16 → 2026-03-03 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-03 21:05:14

●A172.67.71.1232026-02-16 → 2026-03-03 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-03 21:05:14

○A198.27.76.852016-12-21 → 2016-12-21 · 3 obs

● 2016-12-21 06:22:46
○ 2026-02-16 03:42:14
○ 2026-03-03 21:05:14

●A2606:4700:20::681a:cd22026-02-16 → 2026-03-03 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-03 21:05:14

●A2606:4700:20::681a:dd22026-02-16 → 2026-03-03 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-03 21:05:14

●A2606:4700:20::ac43:477b2026-02-16 → 2026-03-03 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-03 21:05:14

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...	-
duelingbook.com	coco.ns.cloudflare.com, tony.ns.cloudflare.com	12 records

✅ Authoritative Response

Server: 108.162.193.240

NS records: coco.ns.cloudflare.com, tony.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for duelingbook.com (unsigned zone)

⏱️ Timing

Total: 246ms | Queries: -

📄 Records

Type	Count	Sample Data
A	3	`172.67.71.123, 104.26.13.210...`
AAAA	3	`2606:4700:20::681a:cd2, 2606:4700:20::681a:dd2...`
NS	2	`coco.ns.cloudflare.com, tony.ns.cloudflare.com`
MX	1	`master.duelingbook.com (pri: 1)`
TXT	2	`google-site-verification=jcon59ZdTQB1lyU, v=spf1 include:_spf.mailersend.net ip4:1`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`coco.ns.cloudflare.com dns.cloudflare.co`

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (coco.ns.cloudflare.com, coco.ns.cloudflare.com, coco.ns.cloudflare.com...)

Analysis

Hierarchy

duelingbook.com is a parent of duel.duelingbook.com, server.duelingbook.com, www.duelingbook.com and master.duelingbook.com.

IP Addresses

Six IP numbers are pointed to by duelingbook.com: 2606:4700:20::681a:cd2, 2606:4700:20::681a:dd2, 2606:4700:20::ac43:477b, 104.26.12.210, 104.26.13.210 and 172.67.71.123.

other host names for instance 10minuteschool.com, rutor.or.at, www.motone.cz, wbparts.com and www.makewebeasy.com share IP numbers with duelingbook.com.

Name Servers

duelingbook.com is delegated to two name servers: coco.ns.cloudflare.com and tony.ns.cloudflare.com.

duelingbook.com shares the same name server setup as other domains, for example edulandimmigration.com, spectrenetworks.com, recar.lt, piphunt.com and tickrate.com.

duelingbook.com at least partially shares name servers with other domains, for instance 79b090c00629.com, previous.com, zaxianguankanhpian.com.cn, mianfeixiaoshipinzhenrenchkou.com.cn and (0x736578)yjapanese(0x706f726e).com.

These name servers are commonly used with samara.ns.cloudflare.com, ernest.ns.cloudflare.com and nero.ns.cloudflare.com.

Host names with six IP numbers:

coco.ns.cloudflare.com points to: 2606:4700:50::adf5:3a68, 2803:f800:50::6ca2:c068, 2a06:98c1:50::ac40:2068, 108.162.192.104, 172.64.32.104 and 173.245.58.104; tony.ns.cloudflare.com points to: 2606:4700:58::adf5:3bf0, 2803:f800:50::6ca2:c1f0, 2a06:98c1:50::ac40:21f0, 108.162.193.240, 172.64.33.240 and 173.245.59.240.

Mail Servers

duelingbook.com is handled by a single mail server, master.duelingbook.com.

duelingbook.com shares the same mail server setup as other domains, for example master.duelingbook.com.

Host name master.duelingbook.com points to IP address 176.123.9.3.

duelingbook.com - robtex.com

duelingbook.com

com

Previously MX for

Subdomains

Same first word

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

Hierarchy

IP Addresses

Name Servers

Mail Servers

`duelingbook.com`

`com`