`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 → 2026-03-06 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-06 16:16:24

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

● 2016-12-21 06:22:46
○ 2026-02-16 03:42:14
○ 2026-03-06 16:16:24

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

● 2016-12-21 06:22:46
○ 2026-02-16 03:42:14
○ 2026-03-06 16:16:24

●NStony.ns.cloudflare.com2026-02-16 → 2026-03-06 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-06 16:16:24

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

● 2016-12-21 06:22:46
○ 2026-02-16 03:42:14
○ 2026-03-06 16:16:24

●MXmaster.duelingbook.com2026-02-16 → 2026-03-06 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-06 16:16:24

●A104.26.12.2102026-02-16 → 2026-03-06 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-06 16:16:24

●A104.26.13.2102026-02-16 → 2026-03-06 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-06 16:16:24

●A172.67.71.1232026-02-16 → 2026-03-06 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-06 16:16:24

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

● 2016-12-21 06:22:46
○ 2026-02-16 03:42:14
○ 2026-03-06 16:16:24

●A2606:4700:20::681a:cd22026-02-16 → 2026-03-06 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-06 16:16:24

●A2606:4700:20::681a:dd22026-02-16 → 2026-03-06 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-06 16:16:24

●A2606:4700:20::ac43:477b2026-02-16 → 2026-03-06 · 3 obs

○ 2016-12-21 06:22:46
● 2026-02-16 03:42:14
● 2026-03-06 16:16:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	k.gtld-servers.net, e.gtld-servers.net, f.gtld-servers.net, a.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: 1137ms | Queries: -

📄 Records

Type	Count	Sample Data
A	3	`104.26.12.210, 172.67.71.123...`
AAAA	3	`2606:4700:20::ac43:477b, 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 has children duel.duelingbook.com, server.duelingbook.com, www.duelingbook.com and master.duelingbook.com.

IP Addresses

duelingbook.com resolves to six IP numbers: 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

Two name servers coco.ns.cloudflare.com and tony.ns.cloudflare.com are delegated to duelingbook.com.

duelingbook.com uses the same name server configuration as other domains, such as edulandimmigration.com, spectrenetworks.com, recar.lt, piphunt.com and tickrate.com.

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

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

Host names with six IP numbers: Host name 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; host name 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.

The mail server setup for duelingbook.com matches that of other domains, for instance master.duelingbook.com.

master.duelingbook.com points to one IP number: 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`