opensource-training.com - dns.ninja
opensource-training.com
| DNSSEC | ⚠️ Not signed | ||||||
| NS | ns1.nohup.info ⚠️ Not in zone NS records | ||||||
| A | 91.213.36.8🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg | ||||||
| PTR | ns0.spenneberg.net | ||||||
| NS | ns2.nohup.info ⚠️ Not in zone NS records | ||||||
| A | 91.213.36.50🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg | ||||||
| PTR | ns2.nohup.info | ||||||
| NS | ns3.nohup.info ⚠️ Not in zone NS records | ||||||
| A | 91.213.36.32🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg | ||||||
| NS | ns5.nohup.info ⚠️ Not in zone NS records | ||||||
| A | 85.214.194.4🇩🇪 STRATO85.214.0.0/15 AG | ||||||
| PTR | h3004703.stratoserver.net | ||||||
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=1785013112 | ||||||
Same first word
opensource-training.de |
opensource-training.com |
opensource-training.net |
opensource-training.org |
DNS History
11 records (4 active, 7 former)
○NSns0.spenneberg.net2020-01-22 → 2020-01-22 · 3 obs
○ 2026-02-14 23:35:58
○ 2026-07-25 21:18:08
●NSns1.nohup.info2026-02-14 → 2026-07-25 · 3 obs
● 2026-02-14 23:35:58
● 2026-07-25 21:18:08
○NSns1.spenneberg.net2020-01-22 → 2020-01-22 · 3 obs
○ 2026-02-14 23:35:58
○ 2026-07-25 21:18:08
●NSns2.nohup.info2026-02-14 → 2026-07-25 · 3 obs
● 2026-02-14 23:35:58
● 2026-07-25 21:18:08
○NSns2.spenneberg.net2020-01-22 → 2020-01-22 · 3 obs
○ 2026-02-14 23:35:58
○ 2026-07-25 21:18:08
●NSns3.nohup.info2026-02-14 → 2026-07-25 · 3 obs
● 2026-02-14 23:35:58
● 2026-07-25 21:18:08
○NSns3.spenneberg.net2020-01-22 → 2020-01-22 · 3 obs
○ 2026-02-14 23:35:58
○ 2026-07-25 21:18:08
○NSns4.nohup.info2020-01-22 → 2020-01-22 · 3 obs
○ 2026-02-14 23:35:58
○ 2026-07-25 21:18:08
●NSns5.nohup.info2026-02-14 → 2026-07-25 · 3 obs
● 2026-02-14 23:35:58
● 2026-07-25 21:18:08
○MXxchg.spenneberg.net2020-01-22 → 2026-06-02 · 4 obs
● 2026-06-02 05:16:24
○ 2026-06-26 15:28:26
○ 2026-07-25 21:18:08
○A91.213.36.92020-01-22 → 2026-06-02 · 4 obs
● 2026-06-02 05:16:24
○ 2026-06-26 15:28:26
○ 2026-07-25 21:18:08
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| opensource-training.com | ns3.nohup.info, ns2.nohup.info, ns1.nohup.info, ns5.nohup.info | - |
✅ Authoritative Response
Server:91.213.36.8
NS records: ns3.nohup.info, ns2.nohup.info, ns1.nohup.info, ns5.nohup.info
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 4870ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 91.213.36.9 |
| NS | 4 | ns1.nohup.info, ns2.nohup.info... |
| MX | 1 | xchg.spenneberg.net (pri: 5) |
| TXT | 1 | v=spf1 +mx ~all |
| SOA | 1 | ns3.nohup.info dns.nohup.info |
Analysis
Name Servers
The NS records for opensource-training.com point to four name servers: ns1.nohup.info, ns2.nohup.info, ns3.nohup.info and ns5.nohup.info.
opensource-training.com partially shares its NS delegation with several other domains, including bsd-training.de, wes-t.de, os-t.net and two others.
These name servers are regularly seen alongside ns4.nohup.info and ns0.nohup.info as name servers.
The hosts ns1.nohup.info, ns2.nohup.info, ns3.nohup.info and ns5.nohup.info all resolve to exactly one IP address each: 91.213.36.8, 91.213.36.50, 91.213.36.32 and 85.214.194.4 respectively.