dev-coursera.org - robtex.com
dev-coursera.org
| DNSSEC | ⚠️ Not signed | ||||||
| NS | ns-567.awsdns-06.net ⭐ | ||||||
| A | 2600:9000:5302:3700::1🇺🇸 Amazon2600:9000:5302::/48 - CloudFront | ||||||
| PTR | ns-567.awsdns-06.net | ||||||
| A | 205.251.194.55🇺🇸 Amazon205.251.194.0/24 prefix | ||||||
| PTR | ns-567.awsdns-06.net | ||||||
| NS | ns-1417.awsdns-49.org | ||||||
| A | 2600:9000:5305:8900::1🇺🇸 Amazon2600:9000:5305::/48 - CloudFront | ||||||
| PTR | ns-1417.awsdns-49.org | ||||||
| A | 205.251.197.137🇺🇸 Amazon205.251.197.0/24 prefix | ||||||
| PTR | ns-1417.awsdns-49.org | ||||||
| NS | ns-1741.awsdns-25.co.uk | ||||||
| A | 2600:9000:5306:cd00::1🇺🇸 Amazon2600:9000:5306::/48 - CloudFront | ||||||
| PTR | ns-1741.awsdns-25.co.uk | ||||||
| A | 205.251.198.205🇺🇸 Amazon205.251.198.0/24 prefix | ||||||
| PTR | ns-1741.awsdns-25.co.uk | ||||||
| NS | ns-364.awsdns-45.com | ||||||
| A | 2600:9000:5301:6c00::1🇺🇸 Amazon2600:9000:5301::/48 - CloudFront | ||||||
| PTR | ns-364.awsdns-45.com | ||||||
| A | 205.251.193.108🇺🇸 Amazon205.251.193.0/24 prefix | ||||||
| PTR | ns-364.awsdns-45.com | ||||||
| TXT | google-site-verification=Tcdjr2P_LlRdufUjQt1wDVeE-prnu_pyB7aZ1Jju3w8 | ||||||
| SOA | ns-567.awsdns-06.netawsdns-hostmaster@amazon.com serial=1 | ||||||
org
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a0.org.afilias-nst.info ⭐ ⚠️ Not in parent delegation | ||||||
| NS | a2.org.afilias-nst.info ⚠️ Not in parent delegation | ||||||
| NS | b0.org.afilias-nst.org | ||||||
| NS | b2.org.afilias-nst.org | ||||||
| NS | c0.org.afilias-nst.info ⚠️ Not in parent delegation | ||||||
| NS | d0.org.afilias-nst.org | ||||||
| SOA | a0.org.afilias-nst.infohostmaster@donuts.email serial=1776114082 | ||||||
Same first word
dev-coursera.org |
dev-coursera.com |
DNS History
10 records (4 active, 6 former)
●NSns-1417.awsdns-49.org2015-08-08 → 2026-04-13 · 2 obs
● 2026-04-13 21:37:40
●NSns-1741.awsdns-25.co.uk2015-08-08 → 2026-04-13 · 2 obs
● 2026-04-13 21:37:40
●NSns-364.awsdns-45.com2015-08-08 → 2026-04-13 · 2 obs
● 2026-04-13 21:37:40
●NSns-567.awsdns-06.net2015-08-08 → 2026-04-13 · 2 obs
● 2026-04-13 21:37:40
○A23.21.135.132016-03-21 → 2016-07-15 · 5 obs
● 2016-03-21 18:06:30
● 2016-07-15 18:54:02
○ 2017-05-31 08:06:58
○ 2026-04-13 21:37:40
○A23.21.224.2182015-08-08 → 2015-08-08 · 3 obs
○ 2015-12-05 16:27:30
○ 2026-04-13 21:37:40
○A23.21.97.1942016-03-21 → 2016-07-15 · 5 obs
● 2016-03-21 18:06:30
● 2016-07-15 18:54:02
○ 2017-05-31 08:06:58
○ 2026-04-13 21:37:40
○A23.23.78.1282015-08-08 → 2015-08-08 · 3 obs
○ 2015-12-05 16:27:30
○ 2026-04-13 21:37:40
○A54.243.152.862015-12-05 → 2015-12-05 · 4 obs
● 2015-12-05 16:27:30
○ 2016-03-21 18:06:30
○ 2026-04-13 21:37:40
○A54.243.166.1032015-12-05 → 2015-12-05 · 4 obs
● 2015-12-05 16:27:30
○ 2016-03-21 18:06:30
○ 2026-04-13 21:37:40
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| org | b0.org.afilias-nst.org, b2.org.afilias-nst.org, d0.org.afilias-nst.org | - |
| dev-coursera.org | ns-1417.awsdns-49.org, ns-567.awsdns-06.net, ns-1741.awsdns-25.co.uk, ns-364.awsdns-45.com | 1 record |
✅ Authoritative Response
Server:205.251.194.55
NS records: ns-1417.awsdns-49.org, ns-567.awsdns-06.net, ns-1741.awsdns-25.co.uk, ns-364.awsdns-45.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for dev-coursera.org (unsigned zone)
⏱️ Timing
Total: 484ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| NS | 4 | ns-1417.awsdns-49.org, ns-1741.awsdns-25.co.uk... |
| TXT | 1 | google-site-verification=Tcdjr2P_LlRdufU |
| SOA | 1 | ns-567.awsdns-06.net awsdns-hostmaster.a |
📌 Glue Records Collected
Total: 1
Out-of-bailiwick: 1 (ns-1417.awsdns-49.org)
Analysis
Name Servers
dev-coursera.org is delegated to four name servers: ns-364.awsdns-45.com, ns-567.awsdns-06.net, ns-1417.awsdns-49.org and ns-1741.awsdns-25.co.uk.
dev-coursera.org at least partially shares name servers with other domains, including gata777.cc, kink-nagoya.shop-pro.jp, scandiaprd.com, fandejuegos.com and mgzi.net.
these name servers are commonly used together with ns-104.awsdns-13.com, ns-667.awsdns-19.net and ns-1633.awsdns-12.co.uk.
Hosts with two IP numbers:
Host ns-364.awsdns-45.com points to 2600:9000:5301:6c00::1 and 205.251.193.108
Host ns-567.awsdns-06.net points to 2600:9000:5302:3700::1 and 205.251.194.55
Host ns-1417.awsdns-49.org points to 2600:9000:5305:8900::1 and 205.251.197.137
Host ns-1741.awsdns-25.co.uk points to 2600:9000:5306:cd00::1 and 205.251.198.205