courses.work - dns.ninja
courses.work
work
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.nic.work ⭐ | ||||||
| NS | b.nic.work | ||||||
| NS | c.nic.work | ||||||
| NS | x.nic.work | ||||||
| NS | y.nic.work | ||||||
| NS | z.nic.work | ||||||
| SOA | a.nic.workadmin@tldns.godaddy serial=1786171632 | ||||||
Same first word
Similar names
DNS History
9 records (7 active, 2 former)
●NSns69.domaincontrol.com2019-01-27 → 2026-08-08 · 2 obs
● 2026-08-08 06:55:50
●NSns70.domaincontrol.com2019-01-27 → 2026-08-08 · 2 obs
● 2026-08-08 06:55:50
●MXinbound-smtp.us-east-1.amazonaws.com2026-03-07 → 2026-08-08 · 3 obs
● 2026-03-07 14:41:46
● 2026-08-08 06:55:50
○A20.67.200.2302026-03-07 → 2026-03-12 · 5 obs
● 2026-03-07 14:41:46
● 2026-03-12 14:36:52
○ 2026-03-28 17:04:38
○ 2026-08-08 06:55:50
○A35.158.20.882019-01-27 → 2020-02-19 · 4 obs
● 2020-02-19 10:19:00
○ 2026-03-07 14:41:46
○ 2026-08-08 06:55:50
●A4.231.91.1862026-03-28 → 2026-08-08 · 3 obs
● 2026-03-28 17:04:38
● 2026-08-08 06:55:50
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| work | a.nic.work, b.nic.work, c.nic.work, x.nic.work... | 12 records |
| courses.work | ns69.domaincontrol.com, ns70.domaincontrol.com | - |
✅ Authoritative Response
Server:173.201.72.45
NS records: ns69.domaincontrol.com, ns70.domaincontrol.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for courses.work (unsigned zone)
⏱️ Timing
Total: 511ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 4.231.91.186 |
| NS | 2 | ns69.domaincontrol.com, ns70.domaincontrol.com |
| MX | 4 | mx.zoho.com (pri: 10), mx2.zoho.com (pri: 20)... |
| TXT | 3 | zoho-verification=zb42394186.zmverify.zo, zoho-verification=zb15481530.zmverify.zo... |
| SOA | 1 | ns69.domaincontrol.com dns.jomax.net |
📌 Glue Records Collected
Total: 12
In-bailiwick: 12 (a.nic.work, a.nic.work, b.nic.work...)
Analysis
IP Addresses
courses.work directs to one IP number, which is 4.231.91.186.
Name Servers
courses.work is served by two delegated name servers, ns69.domaincontrol.com and ns70.domaincontrol.com.
courses.work has the same name server delegation as a number of other domains, such as fxswede.com, cfbdg.com, midwestfabricators.com and two more.
Each of the two host names carries two IP addresses: ns69.domaincontrol.com points to 97.74.104.45 and 2603:5:2184::2d, and ns70.domaincontrol.com points to 173.201.72.45 and 2603:5:2284::2d.
Mail Servers
The four mail servers for courses.work are mx2.zoho.com, mx3.zoho.com, mx.zoho.com and inbound-smtp.us-east-1.amazonaws.com.
courses.work shares at least some of its mail servers with other domains — for example barcodable.com, suthratech.com, prideearth.com and two more.
Hostnames that point to five IP numbers:
inbound-smtp.us-east-1.amazonaws.com directs to 3.211.210.226, 44.206.9.87, 44.210.166.32 and two other IP addresses.
Hosts that resolve to one IP address:
mx2.zoho.com points to the IP address 136.143.183.44.
mx3.zoho.com points to the IP address 204.141.43.44.
mx.zoho.com points to the IP address 204.141.43.44.
These two host names — mx3.zoho.com and mx.zoho.com — each point to 204.141.43.44 IP addresses.