com.courses - robtex.com
com.courses
| DNSSEC | ⚠️ Not signed | ||||||
| NS | ns-1146.awsdns-15.org ⚠️ Not in zone NS records | ||||||
| A | 2600:9000:5304:7a00::1🇺🇸 Amazon2600:9000:5304::/48 - CloudFront | ||||||
| PTR | ns-1146.awsdns-15.org | ||||||
| A | 205.251.196.122🇺🇸 Amazon205.251.196.0/24 prefix | ||||||
| PTR | ns-1146.awsdns-15.org | ||||||
| NS | ns-2011.awsdns-59.co.uk ⚠️ Not in zone NS records | ||||||
| A | 2600:9000:5307:db00::1🇺🇸 Amazon2600:9000:5307::/48 - CloudFront | ||||||
| PTR | ns-2011.awsdns-59.co.uk | ||||||
| A | 205.251.199.219🇺🇸 Amazon205.251.199.0/24 prefix | ||||||
| PTR | ns-2011.awsdns-59.co.uk | ||||||
| NS | ns-433.awsdns-54.com ⚠️ Not in zone NS records | ||||||
| A | 2600:9000:5301:b100::1🇺🇸 Amazon2600:9000:5301::/48 - CloudFront | ||||||
| PTR | ns-433.awsdns-54.com | ||||||
| A | 205.251.193.177🇺🇸 Amazon205.251.193.0/24 prefix | ||||||
| PTR | ns-433.awsdns-54.com | ||||||
| NS | ns-985.awsdns-59.net ⚠️ Not in zone NS records | ||||||
| A | 2600:9000:5303:d900::1🇺🇸 Amazon2600:9000:5303::/48 - CloudFront | ||||||
| PTR | ns-985.awsdns-59.net | ||||||
| A | 205.251.195.217🇺🇸 Amazon205.251.195.0/24 prefix | ||||||
| PTR | ns-985.awsdns-59.net | ||||||
courses
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.nic.courses ⭐ | ||||||
| NS | b.nic.courses | ||||||
| NS | c.nic.courses | ||||||
| NS | x.nic.courses | ||||||
| NS | y.nic.courses | ||||||
| NS | z.nic.courses | ||||||
| SOA | a.nic.coursesadmin@tldns.godaddy serial=1786824778 | ||||||
Same first word
Similar names
DNS History
8 records (4 active, 4 former)
●NSns-1146.awsdns-15.org2020-04-03 → 2026-08-15 · 2 obs
● 2026-08-15 23:51:32
●NSns-2011.awsdns-59.co.uk2020-04-03 → 2026-08-15 · 2 obs
● 2026-08-15 23:51:32
●NSns-433.awsdns-54.com2020-04-03 → 2026-08-15 · 2 obs
● 2026-08-15 23:51:32
●NSns-985.awsdns-59.net2020-04-03 → 2026-08-15 · 2 obs
● 2026-08-15 23:51:32
○A52.84.94.1272020-04-03 → 2026-02-16 · 4 obs
● 2026-02-16 20:42:40
○ 2026-02-18 02:07:20
○ 2026-08-15 23:51:32
○A52.84.94.252020-04-03 → 2026-02-16 · 4 obs
● 2026-02-16 20:42:40
○ 2026-02-18 02:07:20
○ 2026-08-15 23:51:32
○A52.84.94.472020-04-03 → 2026-02-16 · 4 obs
● 2026-02-16 20:42:40
○ 2026-02-18 02:07:20
○ 2026-08-15 23:51:32
○A52.84.94.502020-04-03 → 2026-02-16 · 4 obs
● 2026-02-16 20:42:40
○ 2026-02-18 02:07:20
○ 2026-08-15 23:51:32
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| courses | a.nic.courses, b.nic.courses, c.nic.courses, x.nic.courses... | 12 records |
| com.courses | ns-433.awsdns-54.com, ns-985.awsdns-59.net, ns-1146.awsdns-15.org, ns-2011.awsdns-59.co.uk | - |
✅ Authoritative Response
Server:205.251.199.219
NS records: ns-433.awsdns-54.com, ns-985.awsdns-59.net, ns-1146.awsdns-15.org, ns-2011.awsdns-59.co.uk
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for com.courses (unsigned zone)
⏱️ Timing
Total: 1798ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|
📌 Glue Records Collected
Total: 12
In-bailiwick: 12 (a.nic.courses, a.nic.courses, b.nic.courses...)
Analysis
Name Servers
Four name servers handle the delegation for com.courses: ns-433.awsdns-54.com, ns-985.awsdns-59.net, ns-1146.awsdns-15.org and ns-2011.awsdns-59.co.uk.
The name servers of com.courses overlap at least partially with those of other domains — among them tivadardanka.com, vrtboetiek.be, transitsoil.com and two more.
The name servers ns-1375.awsdns-43.org, ns-92.awsdns-11.com and ns-621.awsdns-13.net are commonly seen alongside these name servers.
Each of the four hosts ns-433.awsdns-54.com, ns-985.awsdns-59.net, ns-1146.awsdns-15.org and ns-2011.awsdns-59.co.uk has two IP addresses. ns-433.awsdns-54.com points to 205.251.193.177 and 2600:9000:5301:b100::1. ns-985.awsdns-59.net points to 205.251.195.217 and 2600:9000:5303:d900::1. ns-1146.awsdns-15.org points to 205.251.196.122 and 2600:9000:5304:7a00::1. ns-2011.awsdns-59.co.uk points to 205.251.199.219 and 2600:9000:5307:db00::1.