lehrcheck.de - robtex.com
lehrcheck.de
| DNSSEC | ⚠️ Not signed | ||||||
| A | 3.124.232.250🇩🇪 Amazon3.124.0.0/14 EC2 FRA prefix | ||||||
| PTR | ec2-3-124-232-250.eu-central-1.compute.amazonaws.com | ||||||
| A | 18.196.16.211🇩🇪 Amazon18.196.0.0/15 EC2 FRA prefix | ||||||
| NS | ns2.opst.de ⭐ | ||||||
| A | 2a00:1c3e:98::53🇩🇪 KNIPPWORLDWIDE2a00:1c3e:98::/47 | ||||||
| PTR | ns2.variomedia.de | ||||||
| A | 185.95.98.53🇩🇪 KNIPPWORLDWIDE185.95.98.0/23 | ||||||
| PTR | ns2.variomedia.de | ||||||
| NS | ns.opst.de | ||||||
| A | 81.28.224.2🇩🇪 SCALEUP81.28.224.0/21 Route object for 81.28.224.0/21 | ||||||
| PTR | ns1.variomedia.de | ||||||
| NS | ns1.opst.de | ||||||
| A | 2a00:1c3e:96::53🇩🇪 KNIPP-AMS-AS2a00:1c3e:96::/47 | ||||||
| PTR | ns1.variomedia.de | ||||||
| A | 185.95.96.53🇩🇪 KNIPP-AMS-AS185.95.96.0/23 | ||||||
| PTR | ns1.variomedia.de | ||||||
| MX | mail.3uu.de ⭐ | ||||||
| A | 87.79.30.25🇩🇪 NETCOLOGNE87.78.0.0/15 NetCologne PA space | ||||||
| PTR | mail.3uu.de | ||||||
| SOA | ns1.opst.desupport@variomedia.de 2022-10-10 #68 | ||||||
de
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | f.nic.de ⭐ | ||||||
| NS | a.nic.de | ||||||
| NS | l.de.net ⚠️ Not in parent delegation | ||||||
| NS | n.de.net ⚠️ Not in parent delegation | ||||||
| NS | s.de.net ⚠️ Not in parent delegation | ||||||
| NS | z.nic.de | ||||||
| SOA | f.nic.dedns-operations@denic.de serial=1771291602 | ||||||
Same first word
lehrcheck.de |
DNS History
10 records (6 active, 4 former)
○A18.192.174.2542026-03-11 → 2026-03-11 · 2 obs
○ 2026-03-11 05:21:30
●A18.196.16.2112026-03-11 → 2026-03-11 · 3 obs
● 2026-03-11 05:21:28
● 2026-03-11 05:21:30
○A195.66.99.2172015-08-05 → 2017-02-15 · 4 obs
● 2017-02-15 10:42:48
○ 2020-04-08 06:52:20
○ 2026-03-11 05:21:30
○A195.66.99.962020-04-08 → 2020-04-08 · 4 obs
● 2020-04-08 06:52:20
○ 2026-03-11 05:21:28
○ 2026-03-11 05:21:30
●A3.124.232.2502026-03-11 → 2026-03-11 · 3 obs
● 2026-03-11 05:21:28
● 2026-03-11 05:21:30
○A3.126.25.1592026-03-11 → 2026-03-11 · 2 obs
○ 2026-03-11 05:21:30
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| de | a.nic.de, f.nic.de, z.nic.de | - |
| lehrcheck.de | ns.opst.de, ns2.opst.de | 2 records |
✅ Authoritative Response
Server: 185.95.98.53
NS records: ns.opst.de, ns2.opst.de
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for lehrcheck.de (unsigned zone)
⏱️ Timing
Total: 1158ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 3.124.232.250, 18.196.16.211 |
| NS | 2 | ns2.opst.de, ns.opst.de |
| MX | 1 | mail.3uu.de (pri: 10) |
| SOA | 1 | ns1.opst.de support.variomedia.de |
📌 Glue Records Collected
Total: 2
Out-of-bailiwick: 2 (ns2.opst.de, ns2.opst.de)
Analysis
IP Addresses
lehrcheck.de points to two IP numbers: 3.124.232.250 and 18.196.16.211.
Other host names such as mindvotes.eu, internetintervjuer.se, skopos1.de, consumerpulse.co.uk and freda-studie.de share IPs with lehrcheck.de.
Name Servers
lehrcheck.de is delegated to three name servers: ns1.opst.de, ns2.opst.de and ns.opst.de.
lehrcheck.de at least partially shares name servers with other domains, for instance nprlistens.org, surveycenter.de, surveypark.co.uk, mercerhcsurveys.com and roche-zukunft-gestalten.de.
Host names with two IP numbers:
ns1.opst.de points to: 2a00:1c3e:96::53 and 185.95.96.53.
ns2.opst.de points to: 2a00:1c3e:98::53 and 185.95.98.53.
Host names with one IP number:
ns.opst.de points to: 81.28.224.2.
Mail Servers
lehrcheck.de is handled by a single mail server, mail.3uu.de.
The mail server setup for lehrcheck.de matches that of other domains, for instance medixglobal.org, unipark.se, prod-us.customervoice360.com, vorbereitungsstudie.de and sky-zufriedenheit.de.
lehrcheck.de shares at least partially some mail servers with other domains, including global-park.biz, zeb-survey.de, global-park.de, efs-survey.com and steb360grad.de.
these mail servers are commonly used together with mail2.3uu.de.
mail.3uu.de points to a single IP: 87.79.30.25.