🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`opencourse.dev`

DNSSEC	⚠️ Not signed
A	2600:9000:24ef:400:1:81a5:5cc0:93a1^{🇺🇸 Amazon2600:9000:24ef::/48}
A	2600:9000:24ef:600:1:81a5:5cc0:93a1^{🇺🇸 Amazon2600:9000:24ef::/48}
A	2600:9000:24ef:2000:1:81a5:5cc0:93a1^{🇺🇸 Amazon2600:9000:24ef::/48}
A	2600:9000:24ef:6000:1:81a5:5cc0:93a1^{🇺🇸 Amazon2600:9000:24ef::/48}
A	2600:9000:24ef:7200:1:81a5:5cc0:93a1^{🇺🇸 Amazon2600:9000:24ef::/48}
A	2600:9000:24ef:aa00:1:81a5:5cc0:93a1^{🇺🇸 Amazon2600:9000:24ef::/48}
A	2600:9000:24ef:c600:1:81a5:5cc0:93a1^{🇺🇸 Amazon2600:9000:24ef::/48}
A	2600:9000:24ef:de00:1:81a5:5cc0:93a1^{🇺🇸 Amazon2600:9000:24ef::/48}
A	18.161.34.13^{🇺🇸 Amazon18.161.32.0/21}
A	18.161.34.28^{🇺🇸 Amazon18.161.32.0/21}
A	18.161.34.99^{🇺🇸 Amazon18.161.32.0/21}
A	18.161.34.102^{🇺🇸 Amazon18.161.32.0/21}
NS	`ns-1825.awsdns-36.co.uk` ⭐
		A	2600:9000:5307:2100::1^{🇺🇸 Amazon2600:9000:5307::/48 - CloudFront}
			PTR	`ns-1825.awsdns-36.co.uk`
		A	205.251.199.33^{🇺🇸 Amazon205.251.199.0/24 prefix}
			PTR	`ns-1825.awsdns-36.co.uk`
NS	`ns-1160.awsdns-17.org`
		A	2600:9000:5304:8800::1^{🇺🇸 Amazon2600:9000:5304::/48 - CloudFront}
			PTR	`ns-1160.awsdns-17.org`
		A	205.251.196.136^{🇺🇸 Amazon205.251.196.0/24 prefix}
			PTR	`ns-1160.awsdns-17.org`
NS	`ns-226.awsdns-28.com`
		A	2600:9000:5300:e200::1^{🇺🇸 Amazon2600:9000:5300::/48 - CloudFront}
			PTR	`ns-226.awsdns-28.com`
		A	205.251.192.226^{🇺🇸 Amazon205.251.192.0/24 prefix}
			PTR	`ns-226.awsdns-28.com`
NS	`ns-992.awsdns-60.net`
		A	2600:9000:5303:e000::1^{🇺🇸 Amazon2600:9000:5303::/48 - CloudFront}
			PTR	`ns-992.awsdns-60.net`
		A	205.251.195.224^{🇺🇸 Amazon205.251.195.0/24 prefix}
			PTR	`ns-992.awsdns-60.net`
MX	`inbound-smtp.us-east-1.amazonaws.com` ⭐
		A	3.211.210.226^{🇺🇸 Amazon3.208.0.0/12 EC2 IAD prefix}
			PTR	`ec2-3-211-210-226.compute-1.amazonaws.com`
		A	44.206.9.87^{🇺🇸 Amazon44.192.0.0/11 EC2 IAD prefix}
			PTR	`ec2-44-206-9-87.compute-1.amazonaws.com`
		A	44.210.166.32^{🇺🇸 Amazon44.192.0.0/11 EC2 IAD prefix}
			PTR	`ec2-44-210-166-32.compute-1.amazonaws.com`
		A	54.164.173.191^{🇺🇸 Amazon54.164.0.0/15}
			PTR	`ec2-54-164-173-191.compute-1.amazonaws.com`
		A	54.197.5.236^{🇺🇸 Amazon54.196.0.0/15}
			PTR	`ec2-54-197-5-236.compute-1.amazonaws.com`
SOA	`ns-1825.awsdns-36.co.uk`awsdns-hostmaster@amazon.com serial=1

`dev`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns-tld1.charlestonroadregistry.com` ⭐
	NS	`ns-tld2.charlestonroadregistry.com`
	NS	`ns-tld3.charlestonroadregistry.com`
	NS	`ns-tld4.charlestonroadregistry.com`
	NS	`ns-tld5.charlestonroadregistry.com`
	SOA	`ns-tld1.charlestonroadregistry.com`cloud-dns-hostmaster@google.com serial=1

🔒 HSTS Preload (+subdomains)

Same first word

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Previous names

Next names

DNS History

29 records (17 active, 12 former)

●NSns-1160.awsdns-17.org2026-10-07 → 2026-11-11 · 2 obs

● 2026-10-07 21:30:28
● 2026-11-11 23:01:30

●NSns-1825.awsdns-36.co.uk2026-10-07 → 2026-11-11 · 2 obs

● 2026-10-07 21:30:28
● 2026-11-11 23:01:30

●NSns-226.awsdns-28.com2026-10-07 → 2026-11-11 · 2 obs

● 2026-10-07 21:30:28
● 2026-11-11 23:01:30

●NSns-992.awsdns-60.net2026-10-07 → 2026-11-11 · 2 obs

● 2026-10-07 21:30:28
● 2026-11-11 23:01:30

●MXinbound-smtp.us-east-1.amazonaws.com2026-11-11 → 2026-11-11 · 2 obs

● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

●A18.161.34.1022026-11-11 → 2026-11-11 · 3 obs

○ 2026-10-07 21:30:28
● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

●A18.161.34.132026-11-11 → 2026-11-11 · 3 obs

○ 2026-10-07 21:30:28
● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

●A18.161.34.282026-11-11 → 2026-11-11 · 3 obs

○ 2026-10-07 21:30:28
● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

●A18.161.34.992026-11-11 → 2026-11-11 · 3 obs

○ 2026-10-07 21:30:28
● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

○A2600:9000:2046:0:1:81a5:5cc0:93a12026-10-07 → 2026-10-07 · 3 obs

● 2026-10-07 21:30:28
○ 2026-11-11 23:01:26
○ 2026-11-11 23:01:30

○A2600:9000:2046:5c00:1:81a5:5cc0:93a12026-10-07 → 2026-10-07 · 3 obs

● 2026-10-07 21:30:28
○ 2026-11-11 23:01:26
○ 2026-11-11 23:01:30

○A2600:9000:2046:800:1:81a5:5cc0:93a12026-10-07 → 2026-10-07 · 3 obs

● 2026-10-07 21:30:28
○ 2026-11-11 23:01:26
○ 2026-11-11 23:01:30

○A2600:9000:2046:9e00:1:81a5:5cc0:93a12026-10-07 → 2026-10-07 · 3 obs

● 2026-10-07 21:30:28
○ 2026-11-11 23:01:26
○ 2026-11-11 23:01:30

○A2600:9000:2046:a200:1:81a5:5cc0:93a12026-10-07 → 2026-10-07 · 3 obs

● 2026-10-07 21:30:28
○ 2026-11-11 23:01:26
○ 2026-11-11 23:01:30

○A2600:9000:2046:a400:1:81a5:5cc0:93a12026-10-07 → 2026-10-07 · 3 obs

● 2026-10-07 21:30:28
○ 2026-11-11 23:01:26
○ 2026-11-11 23:01:30

○A2600:9000:2046:b200:1:81a5:5cc0:93a12026-10-07 → 2026-10-07 · 3 obs

● 2026-10-07 21:30:28
○ 2026-11-11 23:01:26
○ 2026-11-11 23:01:30

○A2600:9000:2046:c200:1:81a5:5cc0:93a12026-10-07 → 2026-10-07 · 3 obs

● 2026-10-07 21:30:28
○ 2026-11-11 23:01:26
○ 2026-11-11 23:01:30

●A2600:9000:24ef:2000:1:81a5:5cc0:93a12026-11-11 → 2026-11-11 · 3 obs

○ 2026-10-07 21:30:28
● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

●A2600:9000:24ef:400:1:81a5:5cc0:93a12026-11-11 → 2026-11-11 · 3 obs

○ 2026-10-07 21:30:28
● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

●A2600:9000:24ef:600:1:81a5:5cc0:93a12026-11-11 → 2026-11-11 · 3 obs

○ 2026-10-07 21:30:28
● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

●A2600:9000:24ef:6000:1:81a5:5cc0:93a12026-11-11 → 2026-11-11 · 3 obs

○ 2026-10-07 21:30:28
● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

●A2600:9000:24ef:7200:1:81a5:5cc0:93a12026-11-11 → 2026-11-11 · 3 obs

○ 2026-10-07 21:30:28
● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

●A2600:9000:24ef:aa00:1:81a5:5cc0:93a12026-11-11 → 2026-11-11 · 3 obs

○ 2026-10-07 21:30:28
● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

●A2600:9000:24ef:c600:1:81a5:5cc0:93a12026-11-11 → 2026-11-11 · 3 obs

○ 2026-10-07 21:30:28
● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

●A2600:9000:24ef:de00:1:81a5:5cc0:93a12026-11-11 → 2026-11-11 · 3 obs

○ 2026-10-07 21:30:28
● 2026-11-11 23:01:26
● 2026-11-11 23:01:30

○A52.85.118.1042026-10-07 → 2026-10-07 · 3 obs

● 2026-10-07 21:30:28
○ 2026-11-11 23:01:26
○ 2026-11-11 23:01:30

○A52.85.118.1212026-10-07 → 2026-10-07 · 3 obs

● 2026-10-07 21:30:28
○ 2026-11-11 23:01:26
○ 2026-11-11 23:01:30

○A52.85.118.22026-10-07 → 2026-10-07 · 3 obs

● 2026-10-07 21:30:28
○ 2026-11-11 23:01:26
○ 2026-11-11 23:01:30

○A52.85.118.912026-10-07 → 2026-10-07 · 3 obs

● 2026-10-07 21:30:28
○ 2026-11-11 23:01:26
○ 2026-11-11 23:01:30

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
dev	ns-tld3.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com, ns-tld1.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com...	10 records
opencourse.dev	ns-1160.awsdns-17.org, ns-1825.awsdns-36.co.uk, ns-226.awsdns-28.com, ns-992.awsdns-60.net	-

✅ Authoritative Response

Server:205.251.195.224

NS records: ns-1160.awsdns-17.org, ns-1825.awsdns-36.co.uk, ns-226.awsdns-28.com, ns-992.awsdns-60.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for opencourse.dev (unsigned zone)

⏱️ Timing

Total: 791ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`18.161.34.13, 18.161.34.28...`
AAAA	8	`2600:9000:24ef:8800:1:81a5:5cc0:93a1, 2600:9000:24ef:8000:1:81a5:5cc0:93a1...`
NS	4	`ns-1160.awsdns-17.org, ns-1825.awsdns-36.co.uk...`
MX	1	`inbound-smtp.us-east-1.amazonaws.com (pr`
SOA	1	`ns-1825.awsdns-36.co.uk awsdns-hostmaste`

📌 Glue Records Collected

Total: 10

Out-of-bailiwick: 10 (ns-tld5.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com...)

Analysis

IP Addresses

opencourse.dev has 12 IP addresses — 18.161.34.13, 18.161.34.28, 18.161.34.99 and 9 more.

Name Servers

The authoritative name servers for opencourse.dev are ns-226.awsdns-28.com, ns-992.awsdns-60.net, ns-1160.awsdns-17.org and ns-1825.awsdns-36.co.uk.

opencourse.dev partially shares its NS delegation with several other domains, including mei-yu-art.com, ls.st, interracialpayperview.com and two others.

These name servers regularly co-occur with the name servers ns-643.awsdns-16.net, ns-1102.awsdns-09.org and ns-1926.awsdns-48.co.uk.

ns-226.awsdns-28.com, ns-992.awsdns-60.net, ns-1160.awsdns-17.org and ns-1825.awsdns-36.co.uk each carry two IP addresses. ns-226.awsdns-28.com has 205.251.192.226 and 2600:9000:5300:e200::1; ns-992.awsdns-60.net has 205.251.195.224 and 2600:9000:5303:e000::1; ns-1160.awsdns-17.org has 205.251.196.136 and 2600:9000:5304:8800::1; ns-1825.awsdns-36.co.uk has 205.251.199.33 and 2600:9000:5307:2100::1.

Mail Servers

Mail for opencourse.dev is handled by a single mail server, inbound-smtp.us-east-1.amazonaws.com.

inbound-smtp.us-east-1.amazonaws.com resolves to five IP numbers: 3.211.210.226, 44.206.9.87, 44.210.166.32 and two others.

opencourse.dev - robtex.com

opencourse.dev

dev

Same first word

Similar names

Previous names

Next names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

IP Addresses

Name Servers

Mail Servers

`opencourse.dev`

`dev`