`bitcoincourse.io`

DNSSEC	⚠️ Not signed
A	2600:1901:0:51b9::^{🇺🇸 Google2600:1901::/32}
A	34.76.205.124^{🇧🇪 Google34.76.192.0/20}
NS	`ns1.all-harmless.domains` ⭐
		A	35.240.85.128^{🇧🇪 Google35.240.80.0/20}
			PTR	`128.85.240.35.bc.googleusercontent.com`
NS	`ns2.all-harmless.domains`
		A	35.195.10.241^{🇧🇪 Google35.195.0.0/20}
			PTR	`241.10.195.35.bc.googleusercontent.com`
MX	`mx.all-harmless.domains` ⭐
		A	35.205.191.230^{🇧🇪 Google35.205.176.0/20}
			PTR	`230.191.205.35.bc.googleusercontent.com`
SOA	`ns1.all-harmless.domains`admin@all-harmless.domains serial=1785805465

`io`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a0.nic.io` ⭐
	NS	`a2.nic.io`
	NS	`b0.nic.io`
	NS	`c0.nic.io`
	SOA	`a0.nic.io`hostmaster@donuts.email serial=1785842444

⚠️ On DNS blocklist: tif, tif.medium, tif.mini

Same first word

bitcoincourse.io

bitcoincourse.herokuapp.com

bitcoincourse.com

bitcoincourse.co

Similar names

coursebitcoin.com

sourcebitcoin.com

bitcoinsource.net

DNS History

11 records (5 active, 6 former)

○NSkeyla.ns.cloudflare.com2026-07-10 → 2026-07-10 · 3 obs

● 2026-07-10 03:37:48
○ 2026-07-18 23:05:04
○ 2026-08-04 11:49:28

○NSnero.ns.cloudflare.com2026-07-10 → 2026-07-10 · 3 obs

● 2026-07-10 03:37:48
○ 2026-07-18 23:05:04
○ 2026-08-04 11:49:28

●NSns1.all-harmless.domains2026-07-18 → 2026-08-04 · 3 obs

○ 2026-07-10 03:37:48
● 2026-07-18 23:05:04
● 2026-08-04 11:49:28

●NSns2.all-harmless.domains2026-07-18 → 2026-08-04 · 3 obs

○ 2026-07-10 03:37:48
● 2026-07-18 23:05:04
● 2026-08-04 11:49:28

●MXmx.all-harmless.domains2026-07-18 → 2026-08-04 · 2 obs

● 2026-07-18 23:05:04
● 2026-08-04 11:49:28

○A104.21.80.1212026-07-10 → 2026-07-10 · 3 obs

● 2026-07-10 03:37:48
○ 2026-07-18 23:05:04
○ 2026-08-04 11:49:28

○A172.67.181.112026-07-10 → 2026-07-10 · 3 obs

● 2026-07-10 03:37:48
○ 2026-07-18 23:05:04
○ 2026-08-04 11:49:28

●A2600:1901:0:51b9::2026-07-18 → 2026-08-04 · 3 obs

○ 2026-07-10 03:37:48
● 2026-07-18 23:05:04
● 2026-08-04 11:49:28

○A2606:4700:3031::6815:50792026-07-10 → 2026-07-10 · 3 obs

● 2026-07-10 03:37:48
○ 2026-07-18 23:05:04
○ 2026-08-04 11:49:28

○A2606:4700:3031::ac43:b50b2026-07-10 → 2026-07-10 · 3 obs

● 2026-07-10 03:37:48
○ 2026-07-18 23:05:04
○ 2026-08-04 11:49:28

●A34.76.205.1242026-07-18 → 2026-08-04 · 3 obs

○ 2026-07-10 03:37:48
● 2026-07-18 23:05:04
● 2026-08-04 11:49:28

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
io	a0.nic.io, a2.nic.io, b0.nic.io, c0.nic.io	-
bitcoincourse.io	ns2.all-harmless.domains, ns1.all-harmless.domains	-

✅ Authoritative Response

Server:35.240.85.128

NS records: ns2.all-harmless.domains, ns1.all-harmless.domains

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for bitcoincourse.io (unsigned zone)

⏱️ Timing

Total: 612ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`34.76.205.124`
AAAA	1	`2600:1901:0:51b9::`
NS	2	`ns1.all-harmless.domains, ns2.all-harmless.domains`
MX	1	`mx.all-harmless.domains (pri: 10)`
SOA	1	`ns1.all-harmless.domains admin.all-harml`

Analysis

IP Addresses

bitcoincourse.io has two IP addresses: 34.76.205.124 and 2600:1901:0:51b9::

kutxa-empresa.com, (0x62616e6762726f73)s.ru.com, www.gestaoempresarial.info plus two other host names have IP numbers in common with bitcoincourse.io.

Name Servers

bitcoincourse.io is delegated to two name servers: ns1.all-harmless.domains and ns2.all-harmless.domains.

The name server configuration of bitcoincourse.io is shared with other domains, for instance solicitarprotecao.live, suasvantagens.live, pixhub.click and two others.

Each of ns1.all-harmless.domains and ns2.all-harmless.domains has one IP address: ns1.all-harmless.domains uses 35.240.85.128 and ns2.all-harmless.domains uses 35.195.10.241.

Mail Servers

bitcoincourse.io uses one mail server — mx.all-harmless.domains.

The mail server setup of bitcoincourse.io matches that of other domains such as acessonetbia.com, juridicochat.pro, infinitex.za.com and two others.

mx.all-harmless.domains resolves to a single IP number: 35.205.191.230.

bitcoincourse.io - robtex.com