coursebuilder.de - dns.ninja
coursebuilder.de
| DNSSEC | ⚠️ Not signed | ||||||
| A | 91.195.241.232🇩🇪 SEDO91.195.240.0/23 -NET-PI | ||||||
| NS | sl1.sedo.com ⭐ | ||||||
| A | 91.195.240.173🇩🇪 SEDO91.195.240.0/23 -NET-PI | ||||||
| NS | sl2.sedo.com | ||||||
| A | 91.195.241.173🇩🇪 SEDO91.195.240.0/23 -NET-PI | ||||||
| MX | localhost ⭐ | ||||||
| TXT | v=spf1 -all | ||||||
| SOA | sl1.sedo.comhostmaster@sedo.de 2018-05-16 #1 | ||||||
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=1781952581 | ||||||
Same first word
Similar names
DNS History
9 records (4 active, 5 former)
○NSns.namespace4you.de2015-07-05 → 2018-12-19 · 4 obs
● 2018-12-19 16:32:38
○ 2026-05-04 07:57:32
○ 2026-06-20 10:53:20
○NSns2.namespace4you.de2015-07-05 → 2018-12-19 · 4 obs
● 2018-12-19 16:32:38
○ 2026-05-04 07:57:32
○ 2026-06-20 10:53:20
●NSsl1.sedo.com2026-05-04 → 2026-06-20 · 3 obs
● 2026-05-04 07:57:32
● 2026-06-20 10:53:20
●NSsl2.sedo.com2026-05-04 → 2026-06-20 · 3 obs
● 2026-05-04 07:57:32
● 2026-06-20 10:53:20
●MXlocalhost2026-05-04 → 2026-06-20 · 3 obs
● 2026-05-04 07:57:32
● 2026-06-20 10:53:20
○MXmxlb.ispgateway.de2015-07-05 → 2018-12-19 · 4 obs
● 2018-12-19 16:32:38
○ 2026-05-04 07:57:32
○ 2026-06-20 10:53:20
○A134.119.247.472016-05-01 → 2018-12-19 · 5 obs
● 2016-05-01 03:14:32
● 2018-12-19 16:32:38
○ 2026-05-04 07:57:32
○ 2026-06-20 10:53:20
●A91.195.241.2322026-05-04 → 2026-06-20 · 3 obs
● 2026-05-04 07:57:32
● 2026-06-20 10:53:20
○A93.180.153.1082015-07-05 → 2016-02-02 · 4 obs
● 2016-02-02 13:51:28
○ 2016-05-01 03:14:32
○ 2026-06-20 10:53:20
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| de | a.nic.de, f.nic.de, z.nic.de | - |
| coursebuilder.de | sl1.sedo.com, sl2.sedo.com | - |
✅ Authoritative Response
Server:91.195.240.173
NS records: sl1.sedo.com, sl2.sedo.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for coursebuilder.de (unsigned zone)
⏱️ Timing
Total: 624ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 91.195.241.232 |
| NS | 2 | sl1.sedo.com, sl2.sedo.com |
| MX | 1 | localhost (pri: 0) |
| TXT | 1 | v=spf1 -all |
| SOA | 1 | sl1.sedo.com hostmaster.sedo.de |
Analysis
IP Addresses
coursebuilder.de directs to one IP number, which is 91.195.241.232.
Among the host names that share IP numbers with coursebuilder.de are mail.dieneuewoche.de, compareit.eu, toubib.de and two others.
Name Servers
coursebuilder.de uses two name servers for its delegation: sl1.sedo.com and sl2.sedo.com.
coursebuilder.de has the same name server delegation as a number of other domains, such as skybet.in, hostmaster.(0x736578)yzone.de, rahn.eu and two more.
At least some of coursebuilder.de's name servers are also used by other domains, among them jebel.de.
It is common to find these name servers paired with the name servers ns1.sedoparking.com.
sl1.sedo.com directs to 91.195.240.173 and sl2.sedo.com directs to 91.195.241.173; each host name points to exactly one IP number.
Mail Servers
coursebuilder.de routes its mail through a single mail server, localhost.
coursebuilder.de has the same mail server arrangement as a number of other domains, for example a-x.co.uk, womio.de, iluminar.eu and two more.