opensource-training.de - dns.ninja

opensource-training.de

DNSSEC🔒 Signed (DS record present)
A91.213.36.9🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg
NSns3.nohup.info ⭐
A91.213.36.32🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg
NSns1.nohup.info
A91.213.36.8🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg
PTRns0.spenneberg.net
NSns2.nohup.info
A91.213.36.50🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg
PTRns2.nohup.info
NSns5.nohup.info
A85.214.194.4🇩🇪 STRATO85.214.0.0/15 AG
PTRh3004703.stratoserver.net
MXxchg.spenneberg.net ⭐
A2001:67c:24:0:d845:ccff:fe0d:cd55🇩🇪 OST-SPE2001:67c:24::/48 OpenSource Training Ralf Spenneberg
PTRxchg.spenneberg.net
A91.213.36.228🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg
TXTv=spf1 +mx ~all
SOAns3.nohup.infodns@nohup.info 2026-07-23 #0

de

DNSSEC🔒 Signed (DS record present)
NSf.nic.de ⭐
NSa.nic.de
NSl.de.net ⚠️ Not in parent delegation
NSn.de.net ⚠️ Not in parent delegation
NSs.de.net ⚠️ Not in parent delegation
NSz.nic.de
SOAf.nic.dedns-operations@denic.de serial=1785370273
WOT: SAFE (60/100)

Subdomains

www.opensource-training.de

Same first word

opensource-training.org
opensource-training.de
opensource-training.com
opensource-training.net

DNS History

13 records (6 active, 7 former)

20162017201820192020202120222023202420252026NSns1.nohup.infons2.nohup.infons3.nohup.infons5.nohup.infons0.spenneberg.netns1.spenneberg.netns2.spenneberg.netns3.spenneberg.netns4.nohup.infoMXxchg.spenneberg.netmx.spenneberg.netA91.213.36.991.213.36.11
○NSns0.spenneberg.net2015-05-29 → 2015-12-30 · 4 obs
● 2015-05-29 12:43:14
● 2015-12-30 02:20:00
○ 2016-04-02 15:52:48
○ 2026-07-30 00:34:04
●NSns1.nohup.info2026-02-14 → 2026-07-30 · 3 obs
○ 2017-04-18 21:46:26
● 2026-02-14 23:36:02
● 2026-07-30 00:34:04
○NSns1.spenneberg.net2015-05-29 → 2017-04-18 · 4 obs
● 2015-05-29 12:43:14
● 2017-04-18 21:46:26
○ 2026-02-14 23:36:02
○ 2026-07-30 00:34:04
●NSns2.nohup.info2026-02-14 → 2026-07-30 · 3 obs
○ 2017-04-18 21:46:26
● 2026-02-14 23:36:02
● 2026-07-30 00:34:04
○NSns2.spenneberg.net2015-05-29 → 2017-04-18 · 4 obs
● 2015-05-29 12:43:14
● 2017-04-18 21:46:26
○ 2026-02-14 23:36:02
○ 2026-07-30 00:34:04
●NSns3.nohup.info2026-02-14 → 2026-07-30 · 3 obs
○ 2017-04-18 21:46:26
● 2026-02-14 23:36:02
● 2026-07-30 00:34:04
○NSns3.spenneberg.net2015-05-29 → 2017-04-18 · 4 obs
● 2015-05-29 12:43:14
● 2017-04-18 21:46:26
○ 2026-02-14 23:36:02
○ 2026-07-30 00:34:04
○NSns4.nohup.info2016-04-02 → 2017-04-18 · 5 obs
○ 2015-12-30 02:20:00
● 2016-04-02 15:52:48
● 2017-04-18 21:46:26
○ 2026-02-14 23:36:02
○ 2026-07-30 00:34:04
●NSns5.nohup.info2026-02-14 → 2026-07-30 · 3 obs
○ 2017-04-18 21:46:26
● 2026-02-14 23:36:02
● 2026-07-30 00:34:04
○MXmx.spenneberg.net2015-05-29 → 2016-04-02 · 4 obs
● 2015-05-29 12:43:14
● 2016-04-02 15:52:48
○ 2016-11-18 18:35:26
○ 2026-07-30 00:34:04
●MXxchg.spenneberg.net2016-11-18 → 2026-07-30 · 6 obs
○ 2016-04-02 15:52:48
● 2016-11-18 18:35:26
● 2026-06-02 05:16:32
○ 2026-06-26 15:28:48
● 2026-07-20 04:01:32
● 2026-07-30 00:34:04
○A91.213.36.112015-05-29 → 2017-04-18 · 4 obs
● 2015-05-29 12:43:14
● 2017-04-18 21:46:26
○ 2026-02-14 23:36:02
○ 2026-07-30 00:34:04
●A91.213.36.92026-02-14 → 2026-07-30 · 6 obs
○ 2017-04-18 21:46:26
● 2026-02-14 23:36:02
● 2026-06-02 05:16:32
○ 2026-06-26 15:28:48
● 2026-07-20 04:01:32
● 2026-07-30 00:34:04

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
dea.nic.de, f.nic.de, z.nic.de-
opensource-training.dens3.nohup.info, ns5.nohup.info, ns1.nohup.info, ns2.nohup.info-

✅ Authoritative Response

Server:85.214.194.4

NS records: ns3.nohup.info, ns5.nohup.info, ns1.nohup.info, ns2.nohup.info

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 3721ms | Queries: -

📄 Records

TypeCountSample Data
A191.213.36.9
NS4ns2.nohup.info, ns3.nohup.info...
MX1xchg.spenneberg.net (pri: 5)
TXT1v=spf1 +mx ~all
SOA1ns3.nohup.info dns.nohup.info

Analysis

Hierarchy

opensource-training.de serves as the parent of www.opensource-training.de.

IP Addresses

opensource-training.de points to a single IP number: 91.213.36.9.

Additional host names — sue-d.de, ostd.de, opensource-training.org and two others — share IP numbers with opensource-training.de.

Name Servers

opensource-training.de has four authoritative name servers: ns1.nohup.info, ns2.nohup.info, ns3.nohup.info and ns5.nohup.info.

opensource-training.de has at least partial name server overlap with other domains, such as ostlogd.com, opensource-security.de, bridgewall.com and two others.

It is common to see these name servers used together with name servers ns4.nohup.info and ns0.nohup.info.

ns1.nohup.info, ns2.nohup.info, ns3.nohup.info and ns5.nohup.info each resolve to one IP address: ns1.nohup.info resolves to 91.213.36.8, ns2.nohup.info resolves to 91.213.36.50, ns3.nohup.info resolves to 91.213.36.32 and ns5.nohup.info resolves to 85.214.194.4.

Mail Servers

opensource-training.de has one mail server: xchg.spenneberg.net.

opensource-training.de shares the same mail server setup as other domains, including opensource-security.de, os-s.de, opensource-training.com and two others.

xchg.spenneberg.net has two IP addresses: 91.213.36.228 and 2001:67c:24:0:d845:ccff:fe0d:cd55.