linuxcourseware.com - dns.ninja
linuxcourseware.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 50.115.20.46🇺🇸 AS5386150.115.16.0/21 KGIX | ||||||
| PTR | 46-20-115-50.tpa.kgix.net | ||||||
| NS | ns1.kualo.net ⭐ | ||||||
| A | 50.115.18.250🇺🇸 AS5386150.115.16.0/21 KGIX | ||||||
| PTR | ns1.kualo.net | ||||||
| NS | ns2.kualo.net | ||||||
| A | 2400:cb00:2049:1::a29f:1822🇺🇸 Cloudflare2400:cb00:2049::/48 , Inc. 101 Townsend Street | ||||||
| PTR | ns2.kualo.net | ||||||
| A | 162.159.24.34Cloudflare162.159.24.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ns2.kualo.net | ||||||
| NS | ns3.kualo.net | ||||||
| A | 2400:cb00:2049:1::a29f:19f7🇺🇸 Cloudflare2400:cb00:2049::/48 , Inc. 101 Townsend Street | ||||||
| PTR | ns3.kualo.net | ||||||
| A | 162.159.25.247Cloudflare162.159.25.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ns3.kualo.net | ||||||
| NS | ns4.kualo.net | ||||||
| A | 2400:cb00:2049:1::a29f:1a99🇺🇸 Cloudflare2400:cb00:2049::/48 , Inc. 101 Townsend Street | ||||||
| PTR | ns4.kualo.net | ||||||
| A | 162.159.26.153Cloudflare162.159.26.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ns4.kualo.net | ||||||
| MX | linuxcourseware.com ⭐ | ||||||
| A | 50.115.20.46🇺🇸 AS5386150.115.16.0/21 KGIX | ||||||
| PTR | 46-20-115-50.tpa.kgix.net | ||||||
| TXT | google-site-verification=B4IwzftMcfE4Jkcj5R-ERPYli7ONl_LiEG1f_hajZdE +ip4:75.... | ||||||
| TXT | mailerlite-domain-verification=52c5a228aa84da61c9207960dc39b99368469bcf | ||||||
| TXT | google-site-verification=0xQMxcPkUHZvw3DrwmmvLl2I-UQg3lMAg-mSgL6NJ-A +ip4:75.... | ||||||
| TXT | v=spf1 ip4:50.115.20.45 ip4:50.115.18.80 include:spf.filteredmx.net +a +mx a ... | ||||||
| SOA | ns1.kualo.netserver_alerts_inbound@kualo.com 2026-07-06 #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.netnstld@verisign-grs.com serial=1784704687 | ||||||
MX for
linuxcourseware.com |
Subdomains
coursefiles.linuxcourseware.com |
Same first word
linuxcourseware.com |
DNS History
17 records (6 active, 11 former)
○NSns.inmotionhosting.com2015-06-08 → 2016-09-08 · 4 obs
● 2016-09-08 18:29:08
○ 2017-04-04 18:30:00
○ 2026-07-22 07:24:26
○NSns1.a2hosting.com2017-04-04 → 2017-04-04 · 4 obs
● 2017-04-04 18:30:00
○ 2026-03-05 21:25:40
○ 2026-07-22 07:24:26
○NSns1.inmotionhosting.com2026-03-05 → 2026-07-22 · 2 obs
○ 2026-07-22 07:24:26
●NSns1.kualo.net2026-03-05 → 2026-07-22 · 3 obs
● 2026-03-05 21:25:40
● 2026-07-22 07:24:26
○NSns2.a2hosting.com2017-04-04 → 2017-04-04 · 4 obs
● 2017-04-04 18:30:00
○ 2026-03-05 21:25:40
○ 2026-07-22 07:24:26
○NSns2.inmotionhosting.com2015-06-08 → 2016-09-08 · 4 obs
● 2016-09-08 18:29:08
○ 2017-04-04 18:30:00
○ 2026-07-22 07:24:26
●NSns2.kualo.net2026-03-05 → 2026-07-22 · 3 obs
● 2026-03-05 21:25:40
● 2026-07-22 07:24:26
○NSns3.a2hosting.com2017-04-04 → 2017-04-04 · 4 obs
● 2017-04-04 18:30:00
○ 2026-03-05 21:25:40
○ 2026-07-22 07:24:26
●NSns3.kualo.net2026-03-05 → 2026-07-22 · 3 obs
● 2026-03-05 21:25:40
● 2026-07-22 07:24:26
○NSns4.a2hosting.com2017-04-04 → 2017-04-04 · 4 obs
● 2017-04-04 18:30:00
○ 2026-03-05 21:25:40
○ 2026-07-22 07:24:26
●NSns4.kualo.net2026-03-05 → 2026-07-22 · 3 obs
● 2026-03-05 21:25:40
● 2026-07-22 07:24:26
●MXlinuxcourseware.com2015-06-08 → 2026-07-22 · 5 obs
● 2026-06-08 17:57:08
○ 2026-06-08 19:06:56
● 2026-06-08 20:00:10
● 2026-07-22 07:24:26
○A209.182.196.262026-03-05 → 2026-07-22 · 2 obs
○ 2026-07-22 07:24:26
○A50.115.18.842026-03-05 → 2026-06-08 · 7 obs
● 2026-03-05 21:25:40
● 2026-06-08 17:57:08
○ 2026-06-08 19:06:56
● 2026-06-08 20:00:10
○ 2026-06-14 02:53:50
○ 2026-07-22 07:24:26
●A50.115.20.462026-06-14 → 2026-07-22 · 3 obs
● 2026-06-14 02:53:50
● 2026-07-22 07:24:26
○A66.198.240.332017-04-04 → 2017-04-04 · 4 obs
● 2017-04-04 18:30:00
○ 2026-03-05 21:25:40
○ 2026-07-22 07:24:26
○A70.39.233.1762015-06-08 → 2016-09-08 · 4 obs
● 2016-09-08 18:29:08
○ 2017-04-04 18:30:00
○ 2026-07-22 07:24:26
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| linuxcourseware.com | ns1.kualo.net, ns2.kualo.net, ns3.kualo.net, ns4.kualo.net | - |
✅ Authoritative Response
Server:162.159.25.247
NS records: ns1.kualo.net, ns2.kualo.net, ns3.kualo.net, ns4.kualo.net
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for linuxcourseware.com (unsigned zone)
⏱️ Timing
Total: 1281ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 50.115.20.46 |
| NS | 4 | ns3.kualo.net, ns1.kualo.net... |
| MX | 1 | linuxcourseware.com (pri: 0) |
| TXT | 4 | v=spf1 ip4:50.115.20.45 ip4:50.115.18.80, google-site-verification=0xQMxcPkUHZvw3D... |
| SOA | 1 | ns1.kualo.net server_alerts_inbound.kual |
Analysis
Hierarchy
linuxcourseware.com serves as the parent of coursefiles.linuxcourseware.com.
Mail Server Role
linuxcourseware.com is listed as a mail server for itself.
IP Addresses
linuxcourseware.com resolves to one IP address: 50.115.20.46.
Among others, morsecode.net, endoclin.cl, auxant.com and trademarkesports.com resolve to the same IP numbers as linuxcourseware.com.
Name Servers
The authoritative name servers for linuxcourseware.com are ns1.kualo.net, ns2.kualo.net, ns3.kualo.net and ns4.kualo.net.
linuxcourseware.com has at least partial name server overlap with other domains, such as sustainable-properties.com, the-mcconnells.co.uk, scottishsupporters.net and two others.
Hostnames that resolve to two IP addresses:
ns2.kualo.net directs traffic to 162.159.24.34 and 2400:cb00:2049:1::a29f:1822.
ns3.kualo.net directs traffic to 162.159.25.247 and 2400:cb00:2049:1::a29f:19f7.
ns4.kualo.net directs traffic to 162.159.26.153 and 2400:cb00:2049:1::a29f:1a99.
Hosts with just one IP address:
ns1.kualo.net has the IP address 50.115.18.250.
Mail Servers
Mail for linuxcourseware.com is handled by one mail server — linuxcourseware.com.
linuxcourseware.com directs to just one IP number, 50.115.20.46.