coursebook.org - robtex.com
coursebook.org
| DNSSEC | ⚠️ Not signed | ||||||
| A | 13.248.169.48🇺🇸 Amazon13.248.160.0/20 | ||||||
| PTR | a904c694c05102f30.awsglobalaccelerator.com | ||||||
| A | 76.223.54.146🇺🇸 Amazon76.223.48.0/20 | ||||||
| NS | ns3.afternic.com ⭐ | ||||||
| A | 97.74.98.65🇺🇸 GODADDY-DNS97.74.98.0/23 | ||||||
| PTR | ns3.afternic.com | ||||||
| NS | ns4.afternic.com | ||||||
| A | 173.201.66.65🇺🇸 GODADDY-DNS173.201.66.0/23 | ||||||
| PTR | ns4.namefind.com | ||||||
| NS | verification-dbgjncnnzmfgmpuki3e6hz.ns101.verify.hn ⚠️ Not in zone NS records | ||||||
| A | 13.248.169.48🇺🇸 Amazon13.248.160.0/20 | ||||||
| PTR | a904c694c05102f30.awsglobalaccelerator.com | ||||||
| A | 76.223.54.146🇺🇸 Amazon76.223.48.0/20 | ||||||
| PTR | a904c694c05102f30.awsglobalaccelerator.com | ||||||
| TXT | v=spf1 -all | ||||||
| SOA | ns3.afternic.comdns@jomax.net 2025-10-01 #0 | ||||||
org
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a0.org.afilias-nst.info ⭐ ⚠️ Not in parent delegation | ||||||
| NS | a2.org.afilias-nst.info ⚠️ Not in parent delegation | ||||||
| NS | b0.org.afilias-nst.org | ||||||
| NS | b2.org.afilias-nst.org | ||||||
| NS | c0.org.afilias-nst.info ⚠️ Not in parent delegation | ||||||
| NS | d0.org.afilias-nst.org | ||||||
| SOA | a0.org.afilias-nst.infohostmaster@donuts.email serial=1771291736 | ||||||
Subdomains
www.coursebook.org |
Same first word
coursebook.org |
coursebook.eu |
coursebook.com |
coursebook.net |
coursebook.co.uk |
coursebook.co.ke |
coursebook.de |
coursebook.ai |
Similar names
DNS History
11 records (5 active, 6 former)
○NSns1.cishost.ru2015-05-30 → 2017-02-10 · 3 obs
● 2017-02-10 13:09:48
○ 2026-03-09 15:36:22
○NSns2.cishost.ru2015-05-30 → 2017-02-10 · 3 obs
● 2017-02-10 13:09:48
○ 2026-03-09 15:36:22
●NSns3.afternic.com2026-03-09 → 2026-03-09 · 2 obs
● 2026-03-09 15:36:22
●NSns4.afternic.com2026-03-09 → 2026-03-09 · 2 obs
● 2026-03-09 15:36:22
○NSs10.cishost.ru2015-05-30 → 2017-02-10 · 3 obs
● 2017-02-10 13:09:48
○ 2026-03-09 15:36:22
●NSverification-dbgjncnnzmfgmpuki3e6hz.ns101.verify.hn2026-03-09 → 2026-03-09 · 2 obs
● 2026-03-09 15:36:22
○MX.2026-03-09 → 2026-03-09 · 1 obs
○MXmx.yandex.ru2015-05-30 → 2016-07-01 · 4 obs
● 2016-07-01 19:19:26
○ 2017-02-10 13:09:48
○ 2026-03-09 15:36:22
●A13.248.169.482026-03-09 → 2026-03-09 · 2 obs
● 2026-03-09 15:36:22
○A31.41.40.2222015-05-30 → 2017-02-10 · 3 obs
● 2017-02-10 13:09:48
○ 2026-03-09 15:36:22
●A76.223.54.1462026-03-09 → 2026-03-09 · 2 obs
● 2026-03-09 15:36:22
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| org | d0.org.afilias-nst.org, b0.org.afilias-nst.org, b2.org.afilias-nst.org | - |
| coursebook.org | verification-dbgjncnnzmfgmpuki3e6hz.ns101.verify.hn, ns3.afternic.com, ns4.afternic.com | - |
✅ Authoritative Response
Server: 173.201.66.65
NS records: verification-dbgjncnnzmfgmpuki3e6hz.ns101.verify.hn, ns3.afternic.com, ns4.afternic.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for coursebook.org (unsigned zone)
⏱️ Timing
Total: 3316ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 13.248.169.48, 76.223.54.146 |
| NS | 2 | ns3.afternic.com, ns4.afternic.com |
| MX | 1 | . (pri: 0) |
| TXT | 1 | v=spf1 -all |
| SOA | 1 | ns3.afternic.com dns.jomax.net |
Analysis
Hierarchy
coursebook.org is parent of www.coursebook.org.
IP Addresses
coursebook.org points to two IP numbers: 13.248.169.48 and 76.223.54.146.
Other host names, for instance symbior.com, coinlicense.com, playxr.net, jstr.com and www.essentialink.com share IP numbers with coursebook.org.
Name Servers
coursebook.org is delegated to three name servers: ns3.afternic.com, ns4.afternic.com and verification-dbgjncnnzmfgmpuki3e6hz.ns101.verify.hn.
coursebook.org at least partially shares its name servers with other domains, for instance mail.zenith360.com, odamedia.com, altservices.com, speciesplus.com and thetastefultourist.com.
Host names with two IP numbers:
verification-dbgjncnnzmfgmpuki3e6hz.ns101.verify.hn points to 13.248.169.48 and 76.223.54.146.
Host names with one IP number:
ns3.afternic.com points to 97.74.98.65.
ns4.afternic.com points to 173.201.66.65.