vcourse.com - dns.ninja

`vcourse.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3031::ac43:d054^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3037::6815:3520^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.53.32^{Cloudflare104.21.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.208.84^{🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`clyde.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b5b^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`clyde.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c15b^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`clyde.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:215b^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`clyde.ns.cloudflare.com`
		A	108.162.193.91^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`clyde.ns.cloudflare.com`
		A	172.64.33.91^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`clyde.ns.cloudflare.com`
		A	173.245.59.91^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`clyde.ns.cloudflare.com`
NS	`mina.ns.cloudflare.com`
		A	2606:4700:50::a29f:26fb^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`mina.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c2fb^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`mina.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:22fb^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`mina.ns.cloudflare.com`
		A	108.162.194.251^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`mina.ns.cloudflare.com`
		A	162.159.38.251^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`mina.ns.cloudflare.com`
		A	172.64.34.251^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`mina.ns.cloudflare.com`
MX	`smtp.secureserver.net` ⭐
		A	216.69.141.71^{🇺🇸 AS398101216.69.140.0/22}
			PTR	`osplibsmtp01-v01.prod.phx3.secureserver.net`
		A	216.69.141.84^{🇺🇸 AS398101216.69.140.0/22}
			PTR	`osplibsmtp02-v01.prod.phx3.secureserver.net`
		A	216.69.141.113^{🇺🇸 AS398101216.69.140.0/22}
			PTR	`osplibsmtp03-v01.prod.phx3.secureserver.net`
MX	`mailstore1.secureserver.net`⁽¹⁰⁾
		A	216.69.141.78^{🇺🇸 AS398101216.69.140.0/22}
			PTR	`osplibsmtp01-v02.prod.phx3.secureserver.net`
		A	216.69.141.114^{🇺🇸 AS398101216.69.140.0/22}
			PTR	`osplibsmtp03-v02.prod.phx3.secureserver.net`
		A	216.69.141.162^{🇺🇸 AS398101216.69.140.0/22}
			PTR	`osplibsmtp02-v02.prod.phx3.secureserver.net`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.53.32, 172.67.208.84
		IPv6 hints	2606:4700:3031::ac43:d054, 2606:4700:3037::6815:3520
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=225, name=cloudflare-ech.com
SOA	`clyde.ns.cloudflare.com`dns@cloudflare.com serial=2409615812

`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=1786604109

Same first word

vcourse.app

vcourse.org

vcourse.info

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vcourse.com

vcourse.ai

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DNS History

17 records (8 active, 9 former)

●NSclyde.ns.cloudflare.com2026-02-15 → 2026-08-13 · 3 obs

○ 2018-11-11 05:29:02
● 2026-02-15 07:33:58
● 2026-08-13 07:19:16

●NSmina.ns.cloudflare.com2026-02-15 → 2026-08-13 · 3 obs

○ 2018-11-11 05:29:02
● 2026-02-15 07:33:58
● 2026-08-13 07:19:16

○NSns51.domaincontrol.com2015-07-08 → 2018-11-11 · 4 obs

● 2015-07-08 23:58:20
● 2018-11-11 05:29:02
○ 2026-02-15 07:33:58
○ 2026-08-13 07:19:16

○NSns52.domaincontrol.com2015-07-08 → 2018-11-11 · 4 obs

● 2015-07-08 23:58:20
● 2018-11-11 05:29:02
○ 2026-02-15 07:33:58
○ 2026-08-13 07:19:16

●MXmailstore1.secureserver.net2015-07-08 → 2026-08-13 · 2 obs

● 2015-07-08 23:58:20
● 2026-08-13 07:19:16

●MXsmtp.secureserver.net2015-07-08 → 2026-08-13 · 2 obs

● 2015-07-08 23:58:20
● 2026-08-13 07:19:16

●A104.21.53.322026-02-15 → 2026-08-13 · 11 obs

○ 2018-11-11 05:29:02
● 2026-02-15 07:33:58
● 2026-02-25 23:22:02
○ 2026-04-13 21:32:06
○ 2026-04-14 06:15:48
● 2026-04-17 13:47:06
● 2026-06-02 06:07:12
○ 2026-06-13 18:16:48
● 2026-06-30 07:57:14
○ 2026-07-02 08:42:54
● 2026-08-13 07:19:16

●A172.67.208.842026-02-15 → 2026-08-13 · 11 obs

○A188.114.96.02026-04-13 → 2026-07-02 · 9 obs

○ 2026-02-25 23:22:02
● 2026-04-13 21:32:06
● 2026-04-14 06:15:48
○ 2026-04-17 13:47:06
○ 2026-06-02 06:07:12
● 2026-06-13 18:16:48
○ 2026-06-30 07:57:14
● 2026-07-02 08:42:54
○ 2026-08-13 07:19:16

○A188.114.97.02026-04-13 → 2026-07-02 · 9 obs

○A2606:4700:3030::6815:35202026-02-15 → 2026-06-02 · 9 obs

●A2606:4700:3031::ac43:d0542026-06-30 → 2026-08-13 · 4 obs

○ 2026-06-13 18:16:48
● 2026-06-30 07:57:14
○ 2026-07-02 08:42:54
● 2026-08-13 07:19:16

●A2606:4700:3037::6815:35202026-06-30 → 2026-08-13 · 4 obs

○ 2026-06-13 18:16:48
● 2026-06-30 07:57:14
○ 2026-07-02 08:42:54
● 2026-08-13 07:19:16

○A2606:4700:3037::ac43:d0542026-02-15 → 2026-06-02 · 9 obs

○A2a06:98c1:3120::2026-04-13 → 2026-07-02 · 9 obs

○A2a06:98c1:3121::2026-04-13 → 2026-07-02 · 9 obs

○A76.12.148.1942015-07-08 → 2018-11-11 · 4 obs

● 2015-07-08 23:58:20
● 2018-11-11 05:29:02
○ 2026-02-15 07:33:58
○ 2026-08-13 07:19:16

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	c.gtld-servers.net, d.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net...	-
vcourse.com	clyde.ns.cloudflare.com, mina.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.194.251

NS records: clyde.ns.cloudflare.com, mina.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for vcourse.com (unsigned zone)

⏱️ Timing

Total: 179ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.53.32, 172.67.208.84`
AAAA	2	`2606:4700:3031::ac43:d054, 2606:4700:3037::6815:3520`
NS	2	`clyde.ns.cloudflare.com, mina.ns.cloudflare.com`
MX	2	`smtp.secureserver.net (pri: 0), mailstore1.secureserver.net (pri: 10)`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`clyde.ns.cloudflare.com dns.cloudflare.c`

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

vcourse.com directs to four IP numbers, which are 104.21.53.32, 172.67.208.84, 2606:4700:3031::ac43:d054 and 2606:4700:3037::6815:3520.

tltstroy.ru, cialisonline.org, cuanwayang79.online and two other host names share IP numbers with vcourse.com.

Name Servers

Two name servers handle the delegation for vcourse.com: clyde.ns.cloudflare.com and mina.ns.cloudflare.com.

vcourse.com uses the same name servers as several other domains — among them advisornorton.com, parasports.net, medical-sm.ru and two more.

The name servers of vcourse.com overlap at least partially with those of other domains — among them mokel303.dev, typhu88.press, cerchioverde.net and two more.

The name servers elle.ns.cloudflare.com, ray.ns.cloudflare.com and nola.ns.cloudflare.com are commonly seen alongside these name servers.

Hostnames that resolve to 6 IP addresses:

clyde.ns.cloudflare.com resolves to 108.162.193.91, 172.64.33.91 and 173.245.59.91 among others, with 3 other IP addresses in total.

mina.ns.cloudflare.com resolves to 108.162.194.251, 162.159.38.251 and 172.64.34.251 among others, with 3 other IP addresses in total.

Mail Servers

Mail for vcourse.com is handled by two mail servers — mailstore1.secureserver.net and smtp.secureserver.net.

vcourse.com uses an identical mail server configuration to several other domains — among them virtual-flow.com, cincinnatiwebdesign.com, mlsolver.com and two more.

vcourse.com uses mail servers that are also used by other domains, including piscinesbeauport.com, cloudandonline.com and lcd-chip.com.

Both mailstore1.secureserver.net and smtp.secureserver.net point to three IP numbers: mailstore1.secureserver.net points to 216.69.141.78, 216.69.141.114 and 216.69.141.162, while smtp.secureserver.net points to 216.69.141.71, 216.69.141.84 and 216.69.141.113.