com.courses - robtex.com
com.courses
| DNSSEC | ⚠️ Not signed | ||||||
| NS | ns-1146.awsdns-15.org ⭐ | ||||||
| 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 | ||||||
| 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 | ||||||
| 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 | ||||||
| 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 | ||||||
| SOA | ns-1146.awsdns-15.orgawsdns-hostmaster@amazon.com serial=1 | ||||||
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=1777672860 | ||||||
Same first word
Similar names
DNS History
8 records (4 active, 4 former)
●NSns-1146.awsdns-15.org2020-04-03 → 2026-05-01 · 2 obs
● 2026-05-01 22:38:46
●NSns-2011.awsdns-59.co.uk2020-04-03 → 2026-05-01 · 2 obs
● 2026-05-01 22:38:46
●NSns-433.awsdns-54.com2020-04-03 → 2026-05-01 · 2 obs
● 2026-05-01 22:38:46
●NSns-985.awsdns-59.net2020-04-03 → 2026-05-01 · 2 obs
● 2026-05-01 22:38:46
○A52.84.94.1272020-04-03 → 2026-02-16 · 4 obs
● 2026-02-16 20:42:40
○ 2026-02-18 02:07:20
○ 2026-05-01 22:38:46
○A52.84.94.252020-04-03 → 2026-02-16 · 4 obs
● 2026-02-16 20:42:40
○ 2026-02-18 02:07:20
○ 2026-05-01 22:38:46
○A52.84.94.472020-04-03 → 2026-02-16 · 4 obs
● 2026-02-16 20:42:40
○ 2026-02-18 02:07:20
○ 2026-05-01 22:38:46
○A52.84.94.502020-04-03 → 2026-02-16 · 4 obs
● 2026-02-16 20:42:40
○ 2026-02-18 02:07:20
○ 2026-05-01 22:38:46
🔍 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-2011.awsdns-59.co.uk, ns-1146.awsdns-15.org, ns-433.awsdns-54.com, ns-985.awsdns-59.net | - |
✅ Authoritative Response
Server:205.251.199.219
NS records: ns-2011.awsdns-59.co.uk, ns-1146.awsdns-15.org, ns-433.awsdns-54.com, ns-985.awsdns-59.net
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for com.courses (unsigned zone)
⏱️ Timing
Total: 785ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| NS | 4 | ns-1146.awsdns-15.org, ns-2011.awsdns-59.co.uk... |
| SOA | 1 | ns-1146.awsdns-15.org awsdns-hostmaster. |
📌 Glue Records Collected
Total: 12
In-bailiwick: 12 (a.nic.courses, a.nic.courses, b.nic.courses...)
Analysis
Name Servers
com.courses is delegated to four name servers: ns-433.awsdns-54.com, ns-985.awsdns-59.net, ns-1146.awsdns-15.org and ns-2011.awsdns-59.co.uk.
At least part of the name servers for com.courses are shared with other domains, for instance tivadardanka.com, vrtboetiek.be, transitsoil.com, portbra.com.br and townsvillebulletin.com.
These name servers are commonly used together with the name servers ns-1375.awsdns-43.org, ns-92.awsdns-11.com, ns-621.awsdns-13.net, ns-164.awsdns-20.com, ns-1311.awsdns-35.org and ns-1907.awsdns-46.co.uk.
Host names with two IP numbers:
ns-433.awsdns-54.com points to: 2600:9000:5301:b100::1 and 205.251.193.177
ns-985.awsdns-59.net points to: 2600:9000:5303:d900::1 and 205.251.195.217
ns-1146.awsdns-15.org points to: 2600:9000:5304:7a00::1 and 205.251.196.122
ns-2011.awsdns-59.co.uk points to: 2600:9000:5307:db00::1 and 205.251.199.219