`open-study-guide.com`

DNSSEC	⚠️ Not signed
NS	`burt.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b4f^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`burt.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c14f^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`burt.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:214f^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`burt.ns.cloudflare.com`
		A	108.162.193.79^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`burt.ns.cloudflare.com`
		A	172.64.33.79^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`burt.ns.cloudflare.com`
		A	173.245.59.79^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`burt.ns.cloudflare.com`
NS	`chan.ns.cloudflare.com`
		A	2606:4700:50::adf5:3a52^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chan.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c052^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`chan.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2052^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`chan.ns.cloudflare.com`
		A	108.162.192.82^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chan.ns.cloudflare.com`
		A	172.64.32.82^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chan.ns.cloudflare.com`
		A	173.245.58.82^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`chan.ns.cloudflare.com`
SOA	`burt.ns.cloudflare.com`dns@cloudflare.com serial=2402382972

`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=1778415661

Same first word

open-study-guide.com

open-study-guide.org

DNS History

11 records (2 active, 9 former)

●NSburt.ns.cloudflare.com2026-02-16 → 2026-05-10 · 3 obs

○ 2017-05-17 17:49:48
● 2026-02-16 22:42:38
● 2026-05-10 12:32:12

●NSchan.ns.cloudflare.com2026-02-16 → 2026-05-10 · 3 obs

○ 2017-05-17 17:49:48
● 2026-02-16 22:42:38
● 2026-05-10 12:32:12

○NSns03.domaincontrol.com2008-03-12 → 2008-03-12 · 3 obs

● 2008-03-12 10:38:16
○ 2015-06-14 22:32:26
○ 2026-05-10 12:32:12

○NSns04.domaincontrol.com2008-03-12 → 2008-03-12 · 3 obs

● 2008-03-12 10:38:16
○ 2015-06-14 22:32:26
○ 2026-05-10 12:32:12

○NSns1.dnsowl.com2015-06-14 → 2017-05-17 · 5 obs

○ 2008-03-12 10:38:16
● 2015-06-14 22:32:26
● 2017-05-17 17:49:48
○ 2026-02-16 22:42:38
○ 2026-05-10 12:32:12

○NSns2.dnsowl.com2015-06-14 → 2017-05-17 · 5 obs

○ 2008-03-12 10:38:16
● 2015-06-14 22:32:26
● 2017-05-17 17:49:48
○ 2026-02-16 22:42:38
○ 2026-05-10 12:32:12

○NSns3.dnsowl.com2015-06-14 → 2017-05-17 · 5 obs

○ 2008-03-12 10:38:16
● 2015-06-14 22:32:26
● 2017-05-17 17:49:48
○ 2026-02-16 22:42:38
○ 2026-05-10 12:32:12

○MXmailstore1.secureserver.net2008-03-12 → 2008-03-12 · 3 obs

● 2008-03-12 10:38:16
○ 2015-06-14 22:32:26
○ 2026-05-10 12:32:12

○MXsmtp.secureserver.net2008-03-12 → 2008-03-12 · 3 obs

● 2008-03-12 10:38:16
○ 2015-06-14 22:32:26
○ 2026-05-10 12:32:12

○A68.178.232.1002008-03-12 → 2008-03-12 · 3 obs

● 2008-03-12 10:38:16
○ 2015-06-14 22:32:26
○ 2026-05-10 12:32:12

○A72.8.167.2492015-06-14 → 2026-02-16 · 5 obs

○ 2008-03-12 10:38:16
● 2015-06-14 22:32:26
● 2026-02-16 22:42:38
○ 2026-04-07 11:31:26
○ 2026-05-10 12:32:12

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	j.gtld-servers.net, k.gtld-servers.net, f.gtld-servers.net, i.gtld-servers.net...	-
open-study-guide.com	chan.ns.cloudflare.com, burt.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.193.79

NS records: chan.ns.cloudflare.com, burt.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for open-study-guide.com (unsigned zone)

⏱️ Timing

Total: 224ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	2	`burt.ns.cloudflare.com, chan.ns.cloudflare.com`
SOA	1	`burt.ns.cloudflare.com dns.cloudflare.co`

📌 Glue Records Collected

Total: 12

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

Analysis

Name Servers

open-study-guide.com is delegated to two name servers: burt.ns.cloudflare.com and chan.ns.cloudflare.com.

open-study-guide.com shares the same name server setup as holidayinnwinchester.com, jalvayu.in, oceancare.in, chosen-hubs.com and lucky88.bike.

open-study-guide.com at least partially shares name servers with other domains, for instance eth-usdc61.top, berry-is-sweet.com, fasonuretim.net, bftyo.com and meimanrensheng.com.

these name servers are commonly used with theo.ns.cloudflare.com, merlin.ns.cloudflare.com, hugh.ns.cloudflare.com and doug.ns.cloudflare.com.

Host names with six IP numbers:

burt.ns.cloudflare.com points to 2606:4700:58::adf5:3b4f, 2803:f800:50::6ca2:c14f, 2a06:98c1:50::ac40:214f, 108.162.193.79, 172.64.33.79 and 173.245.59.79.

chan.ns.cloudflare.com points to 2606:4700:50::adf5:3a52, 2803:f800:50::6ca2:c052, 2a06:98c1:50::ac40:2052, 108.162.192.82, 172.64.32.82 and 173.245.58.82.

open-study-guide.com - robtex.com