`courseware-olim.com`

DNSSEC	⚠️ Not signed
A	52.85.61.21^{🇺🇸 Amazon52.85.61.0/24 - CloudFront TD}
		PTR	`server-52-85-61-21.ewr53.r.cloudfront.net`
A	52.85.61.42^{🇺🇸 Amazon52.85.61.0/24 - CloudFront TD}
A	52.85.61.43^{🇺🇸 Amazon52.85.61.0/24 - CloudFront TD}
A	52.85.61.75^{🇺🇸 Amazon52.85.61.0/24 - CloudFront TD}
NS	`ns-1883.awsdns-43.co.uk` ⭐
		A	2600:9000:5307:5b00::1^{🇺🇸 Amazon2600:9000:5307::/48 - CloudFront}
			PTR	`ns-1883.awsdns-43.co.uk`
		A	205.251.199.91^{🇺🇸 Amazon205.251.199.0/24 prefix}
			PTR	`ns-1883.awsdns-43.co.uk`
NS	`ns-1173.awsdns-18.org`
		A	2600:9000:5304:9500::1^{🇺🇸 Amazon2600:9000:5304::/48 - CloudFront}
			PTR	`ns-1173.awsdns-18.org`
		A	205.251.196.149^{🇺🇸 Amazon205.251.196.0/24 prefix}
			PTR	`ns-1173.awsdns-18.org`
NS	`ns-291.awsdns-36.com`
		A	2600:9000:5301:2300::1^{🇺🇸 Amazon2600:9000:5301::/48 - CloudFront}
			PTR	`ns-291.awsdns-36.com`
		A	205.251.193.35^{🇺🇸 Amazon205.251.193.0/24 prefix}
			PTR	`ns-291.awsdns-36.com`
NS	`ns-972.awsdns-57.net`
		A	2600:9000:5303:cc00::1^{🇺🇸 Amazon2600:9000:5303::/48 - CloudFront}
			PTR	`ns-972.awsdns-57.net`
		A	205.251.195.204^{🇺🇸 Amazon205.251.195.0/24 prefix}
			PTR	`ns-972.awsdns-57.net`
SOA	`ns-1883.awsdns-43.co.uk`awsdns-hostmaster@amazon.com serial=1

`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

Same first word

courseware-olim.com

DNS History

20 records (8 active, 12 former)

●NSns-1173.awsdns-18.org2026-03-19 → 2026-03-22 · 2 obs

● 2026-03-19 07:47:38
● 2026-03-22 16:42:30

●NSns-1883.awsdns-43.co.uk2026-03-19 → 2026-03-22 · 2 obs

● 2026-03-19 07:47:38
● 2026-03-22 16:42:30

●NSns-291.awsdns-36.com2026-03-19 → 2026-03-22 · 2 obs

● 2026-03-19 07:47:38
● 2026-03-22 16:42:30

●NSns-972.awsdns-57.net2026-03-19 → 2026-03-22 · 2 obs

● 2026-03-19 07:47:38
● 2026-03-22 16:42:30

○A18.165.242.1152026-03-19 → 2026-03-21 · 10 obs

○ 2026-03-19 07:47:38
● 2026-03-19 21:36:08
○ 2026-03-19 22:28:36
● 2026-03-19 23:43:04
○ 2026-03-20 01:20:14
○ 2026-03-20 10:39:26
● 2026-03-20 17:57:22
● 2026-03-21 09:23:30
○ 2026-03-22 14:01:08
○ 2026-03-22 16:42:30

○A18.165.242.392026-03-19 → 2026-03-21 · 10 obs

○A18.165.242.912026-03-19 → 2026-03-21 · 10 obs

○A18.165.242.962026-03-19 → 2026-03-21 · 10 obs

○A3.170.19.722026-03-19 → 2026-03-22 · 9 obs

● 2026-03-19 07:47:38
○ 2026-03-19 21:36:08
○ 2026-03-20 01:20:14
● 2026-03-20 10:39:26
○ 2026-03-20 17:57:22
○ 2026-03-21 09:23:30
● 2026-03-22 14:01:08
○ 2026-03-22 16:42:28
○ 2026-03-22 16:42:30

○A3.170.19.742026-03-19 → 2026-03-22 · 9 obs

○A3.170.19.842026-03-19 → 2026-03-22 · 9 obs

○A3.170.19.972026-03-19 → 2026-03-22 · 9 obs

●A52.85.61.212026-03-22 → 2026-03-22 · 3 obs

○ 2026-03-22 14:01:08
● 2026-03-22 16:42:28
● 2026-03-22 16:42:30

●A52.85.61.422026-03-22 → 2026-03-22 · 3 obs

○ 2026-03-22 14:01:08
● 2026-03-22 16:42:28
● 2026-03-22 16:42:30

●A52.85.61.432026-03-22 → 2026-03-22 · 3 obs

○ 2026-03-22 14:01:08
● 2026-03-22 16:42:28
● 2026-03-22 16:42:30

●A52.85.61.752026-03-22 → 2026-03-22 · 3 obs

○ 2026-03-22 14:01:08
● 2026-03-22 16:42:28
● 2026-03-22 16:42:30

○A99.84.41.1012026-03-19 → 2026-03-20 · 6 obs

○ 2026-03-19 21:36:08
● 2026-03-19 22:28:36
○ 2026-03-19 23:43:04
● 2026-03-20 01:20:14
○ 2026-03-20 10:39:26
○ 2026-03-22 16:42:30

○A99.84.41.172026-03-19 → 2026-03-20 · 6 obs

○ 2026-03-19 21:36:08
● 2026-03-19 22:28:36
○ 2026-03-19 23:43:04
● 2026-03-20 01:20:14
○ 2026-03-20 10:39:26
○ 2026-03-22 16:42:30

○A99.84.41.412026-03-19 → 2026-03-20 · 6 obs

○ 2026-03-19 21:36:08
● 2026-03-19 22:28:36
○ 2026-03-19 23:43:04
● 2026-03-20 01:20:14
○ 2026-03-20 10:39:26
○ 2026-03-22 16:42:30

○A99.84.41.692026-03-19 → 2026-03-20 · 6 obs

○ 2026-03-19 21:36:08
● 2026-03-19 22:28:36
○ 2026-03-19 23:43:04
● 2026-03-20 01:20:14
○ 2026-03-20 10:39:26
○ 2026-03-22 16:42:30

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	d.gtld-servers.net, j.gtld-servers.net, i.gtld-servers.net, g.gtld-servers.net...	-
courseware-olim.com	ns-291.awsdns-36.com, ns-972.awsdns-57.net, ns-1173.awsdns-18.org, ns-1883.awsdns-43.co.uk	1 record

✅ Authoritative Response

Server: 205.251.193.35

NS records: ns-291.awsdns-36.com, ns-972.awsdns-57.net, ns-1173.awsdns-18.org, ns-1883.awsdns-43.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for courseware-olim.com (unsigned zone)

⏱️ Timing

Total: 243ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`52.85.61.21, 52.85.61.43...`
NS	4	`ns-1173.awsdns-18.org, ns-1883.awsdns-43.co.uk...`
SOA	1	`ns-1883.awsdns-43.co.uk awsdns-hostmaste`

📌 Glue Records Collected

Total: 1

Out-of-bailiwick: 1 (ns-291.awsdns-36.com)

Analysis

IP Addresses

courseware-olim.com maps to four IP numbers: 52.85.61.21, 52.85.61.42, 52.85.61.43 and 52.85.61.75.

Other host names, for instance couronne0116.com, boonyang24.com, 9c572a71-fe07-416d-ad42-282a04918344.webreader.io, cdn.skilynx.com and 11challengers.com share IP numbers with courseware-olim.com.

Name Servers

courseware-olim.com is delegated to four name servers: ns-291.awsdns-36.com, ns-972.awsdns-57.net, ns-1173.awsdns-18.org and ns-1883.awsdns-43.co.uk.

courseware-olim.com at least partially shares name servers with other domains such as birdie.awsapps.com, d44wwhhslhzth.cloudfront.net, danaconnect.net, aquadecor-tst.com and cjbcloud.com.

These name servers are commonly used alongside ns-1059.awsdns-04.org, ns-568.awsdns-07.net and ns-301.awsdns-37.com.

Host names with two IP numbers:

ns-291.awsdns-36.com points to 2600:9000:5301:2300::1 and 205.251.193.35

ns-972.awsdns-57.net points to 2600:9000:5303:cc00::1 and 205.251.195.204

ns-1173.awsdns-18.org points to 2600:9000:5304:9500::1 and 205.251.196.149

ns-1883.awsdns-43.co.uk points to 2600:9000:5307:5b00::1 and 205.251.199.91

courseware-olim.com - robtex.com