open-course.com - dns.ninja

open-course.com

DNSSEC⚠️ Not signed
NSns1.flippa.com ⚠️ Not in zone NS records
A18.233.141.236🇺🇸 Amazon18.232.0.0/14 EC2 IAD prefix
PTRec2-18-233-141-236.compute-1.amazonaws.com
NSns2.flippa.com ⚠️ Not in zone NS records
A18.233.141.236🇺🇸 Amazon18.232.0.0/14 EC2 IAD prefix
PTRec2-18-233-141-236.compute-1.amazonaws.com

com

DNSSEC🔒 Signed (DS record present)
NSa.gtld-servers.net ⭐
NSb.gtld-servers.net
NSc.gtld-servers.net
NSd.gtld-servers.net
NSe.gtld-servers.net
NSf.gtld-servers.net
NSg.gtld-servers.net
NSh.gtld-servers.net
NSi.gtld-servers.net
NSj.gtld-servers.net
NSk.gtld-servers.net
NSl.gtld-servers.net
NSm.gtld-servers.net
SOAa.gtld-servers.netnstld@verisign-grs.com serial=1785034877
WOT: UNKNOWN (60/100)

Same first word

open-course.com
open-course.net

Similar names

open-source.org
open-source.solutions
open-source.dk
open-source.eu
open-source.ru
open-source.info
source-open.de
open-source.now.sh
open-source.online
open-source.de
open-source.energy
open-source.co.jp
open-source.us
open-source.guide
open-source.jp
open-source.co.uk
open-source.at
open-source.co.at
open-source.rs
open-source.net
open-source.guru
open-source.nl
open-source.technology
open-source.io
open-source.in
open-source.com
open-source.me
open-source.support
open-source.mobi
open-source.cn
open-source.fr
open-source.co

DNS History

4 records (2 active, 2 former)

201820192020202120222023202420252026NSns1.flippa.comns2.flippa.comA54.175.122.194CNAMEwebapp.parkingpage.production.flippa.com
●NSns1.flippa.com2026-07-12 → 2026-07-26 · 2 obs
● 2026-07-12 08:19:20
● 2026-07-26 03:10:58
●NSns2.flippa.com2026-07-12 → 2026-07-26 · 2 obs
● 2026-07-12 08:19:20
● 2026-07-26 03:10:58
○A54.175.122.1942017-03-22 → 2017-03-22 · 3 obs
● 2017-03-22 03:25:56
○ 2026-07-12 08:19:20
○ 2026-07-26 03:10:58
○CNAMEwebapp.parkingpage.production.flippa.com2017-03-22 → 2017-03-22 · 3 obs
● 2017-03-22 03:25:56
○ 2026-07-12 08:19:20
○ 2026-07-26 03:10:58

🔍 DNS Trace

Analysis

Name Servers

DNS delegation for open-course.com points to two name servers: ns1.flippa.com and ns2.flippa.com.

open-course.com shares its name server setup with other domains, including tophi.net, fnbmagazine.com, sellcarbot.com and two others.

At least some of open-course.com's name servers are shared with other domains, for example shops.us, lateenos.com, aquientequejas.com and two more.

Both ns1.flippa.com and ns2.flippa.com have a single IP address, 18.233.141.236, and share it.

Host names pointing to 18.233.141.236 IP addresses: ns1.flippa.com and ns2.flippa.com.