mail.opencourseware.online - robtex.com

mail.opencourseware.online

DNSSEC⚠️ Not signed
A157.90.33.73🇩🇪 Hetzner157.90.0.0/16 HETZNER-DC
PTRold-psh4.1push.io
A157.90.33.74🇩🇪 Hetzner157.90.0.0/16 HETZNER-DC

opencourseware.online

DNSSEC⚠️ Not signed
A157.90.33.73🇩🇪 Hetzner157.90.0.0/16 HETZNER-DC
A157.90.33.74🇩🇪 Hetzner157.90.0.0/16 HETZNER-DC
NSns1.park-my-domain.net ⭐
NSns2.park-my-domain.net
SOAns1.park-my-domain.nethostmaster@opencourseware.online 2026-04-05 #27

Previously MX for

opencourseware.online

Same first word

mail.hl.cn
mail.nhs.uk
mail.hotmail
mail.gov.om
mail.canon
mail.net.hk
mail.as
mail.ir
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mail.hu.net
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mail.se
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mail.gd
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mail.basicserver.io
mail.coupons
mail.js.org
mail.ch
mail.partners
mail.mt
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mail.town
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mail.com.br
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mail.co.ua
mail.bike
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mail.srv.br
mail.dyn-vpn.de
mail.serveminecraft.net
mail.gov.cn

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DNS History

3 records (2 active, 1 former)

2020202120222023202420252026A157.90.33.73157.90.33.74198.54.120.151
●A157.90.33.732026-04-23 → 2026-04-23 · 3 obs
○ 2019-01-04 02:37:12
● 2026-04-23 20:26:20
● 2026-04-23 20:26:24
●A157.90.33.742026-04-23 → 2026-04-23 · 3 obs
○ 2019-01-04 02:37:12
● 2026-04-23 20:26:20
● 2026-04-23 20:26:24
○A198.54.120.1512019-01-04 → 2019-01-04 · 3 obs
● 2019-01-04 02:37:12
○ 2026-04-23 20:26:20
○ 2026-04-23 20:26:24

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
onlinens10.trs-dns.org, ns01.trs-dns.com, ns01.trs-dns.net, ns10.trs-dns.info-
opencourseware.onlinens2.park-my-domain.net, ns1.park-my-domain.net-

✅ Authoritative Response

Server:65.108.243.18

NS records: ns2.park-my-domain.net, ns1.park-my-domain.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for opencourseware.online (unsigned zone)

⏱️ Timing

Total: 952ms | Queries: -

📄 Records

TypeCountSample Data
A2157.90.33.73, 157.90.33.74

Analysis

IP Addresses

mail.opencourseware.online points to two IP numbers: 157.90.33.73 and 157.90.33.74.

Other host names such as hu4wz1.jflbpf.com, o-pbkj.123rutor.su, o-rowfpxwn.123rutor.su, liendi.com and forte.hostingsiteforfree.com share IPs with mail.opencourseware.online.