concurrentcourses.org - dns.ninja
concurrentcourses.org
| DNSSEC | ⚠️ Not signed | ||||||
| A | 173.254.28.231🇺🇸 EIGI173.254.28.0/23 | ||||||
| PTR | just2023.justhost.com | ||||||
| NS | ns1.justhost.com ⭐ | ||||||
| A | 162.159.24.49Cloudflare162.159.24.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ns1.justhost.com | ||||||
| NS | ns2.justhost.com | ||||||
| A | 162.159.25.241Cloudflare162.159.25.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ns2.justhost.com | ||||||
| MX | mail.concurrentcourses.org ⭐ | ||||||
| A | 173.254.28.231🇺🇸 EIGI173.254.28.0/23 | ||||||
| PTR | just2023.justhost.com | ||||||
| TXT | "v=spf1 a mx ptr include:justhost.com ?all" | ||||||
| SOA | ns1.justhost.comroot@just2023.justhost.com 2025-04-04 #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=1785475359 | ||||||
Subdomains
mail.concurrentcourses.org |
Same first word
concurrentcourses.org |
DNS History
5 records (4 active, 1 former)
●NSns1.justhost.com2015-08-16 → 2026-07-31 · 2 obs
● 2026-07-31 05:38:42
●NSns2.justhost.com2015-08-16 → 2026-07-31 · 2 obs
● 2026-07-31 05:38:42
●MXmail.concurrentcourses.org2015-08-16 → 2026-07-31 · 2 obs
● 2026-07-31 05:38:42
○A173.254.28.152015-08-16 → 2016-12-09 · 4 obs
● 2016-12-09 16:21:44
○ 2020-01-20 23:34:14
○ 2026-07-31 05:38:42
●A173.254.28.2312020-01-20 → 2026-07-31 · 3 obs
● 2020-01-20 23:34:14
● 2026-07-31 05:38:42
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| org | b2.org.afilias-nst.org, d0.org.afilias-nst.org, b0.org.afilias-nst.org | - |
| concurrentcourses.org | ns1.justhost.com, ns2.justhost.com | - |
✅ Authoritative Response
Server:162.159.24.49
NS records: ns1.justhost.com, ns2.justhost.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for concurrentcourses.org (unsigned zone)
⏱️ Timing
Total: 211ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 173.254.28.231 |
| NS | 2 | ns2.justhost.com, ns1.justhost.com |
| MX | 1 | mail.concurrentcourses.org (pri: 0) |
| TXT | 1 | "v=spf1 a mx ptr include:justhost.com ?a |
| SOA | 1 | ns1.justhost.com root.just2023.justhost. |
Analysis
Hierarchy
concurrentcourses.org is a parent domain of mail.concurrentcourses.org.
IP Addresses
concurrentcourses.org points to a single IP number: 173.254.28.231.
Additional host names — mail.1126fps.com, mail.bolsda.com, copifull.com and two others — share IP numbers with concurrentcourses.org.
Name Servers
DNS delegation for concurrentcourses.org points to two name servers: ns1.justhost.com and ns2.justhost.com.
concurrentcourses.org shares its name server setup with other domains, including orlandorealestateappraiser.net, reversegravitygames.com, silverskymarketing.com and two others.
concurrentcourses.org shares at least some of its name servers with other domains, including burnthillsrowing.com, furneuxantiquemaps.com, mediaflux.net and two others.
These name servers are frequently paired with the name servers ns1.pipedns.com, ns3.pipedns.com, ns2.pipedns.com and two others.
ns1.justhost.com and ns2.justhost.com each resolve to one IP number: ns1.justhost.com points to 162.159.24.49 and ns2.justhost.com points to 162.159.25.241.
Mail Servers
concurrentcourses.org has one mail server: mail.concurrentcourses.org.
mail.concurrentcourses.org has exactly one IP number: 173.254.28.231.