courses.opencv.org - robtex.com

courses.opencv.org

DNSSEC⚠️ Not signed
A2606:4700:20::681a:ee0🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:20::681a:fe0🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:20::ac43:4855🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.26.14.224Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.26.15.224Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.72.85🇺🇸 Cloudflare172.67.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
TXTv=spf1 -all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.26.14.224, 104.26.15.224, 172.67.72.85
IPv6 hints2606:4700:20::681a:ee0, 2606:4700:20::681a:fe0, 2606:4700:20::ac43:4855

opencv.org

DNSSEC⚠️ Not signed
A2606:4700:20::681a:ee0🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:20::681a:fe0🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:20::ac43:4855🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.26.14.224Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.26.15.224Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.72.85🇺🇸 Cloudflare172.67.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSnina.ns.cloudflare.com ⭐
NSstan.ns.cloudflare.com
MXaspmx.l.google.com ⭐
MXalt1.aspmx.l.google.com(5)
MXalt2.aspmx.l.google.com(5)
MXalt3.aspmx.l.google.com(10)
MXalt4.aspmx.l.google.com(10)
TXT43c363f5-55bc-4a78-ad2a-1d2f79225085
TXT_globalsign-domain-verification=AfIUsqMo_BNmwiXqouAXz9KbkWiI-prm1P0UCLvXRO
TXTgoogle-site-verification=5QC19TB-PMA8dMlHDllsRRmI-7MYaXDxNcB8vXzshFc
TXTgoogle-site-verification=E1ORT1srY97eSSmZOBedZqyVzeJduh1Jll_ehu3hn28
TXTgoogle-site-verification=_RUwdW7VMzMZijQGeaO3zIkuiPMhzXgf6TYj9pSfITw
TXTlinkedin-site-verification=68642795-a0c7-426d-bb71-d3e359c0a1e4
TXTv=spf1 include:_spf.google.com include:mailgun.org -all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.26.14.224, 104.26.15.224, 172.67.72.85
IPv6 hints2606:4700:20::681a:ee0, 2606:4700:20::681a:fe0, 2606:4700:20::ac43:4855
SOAnina.ns.cloudflare.comdns@cloudflare.com serial=2401749726
WOT: SAFE (83/100)
rank #6296 globally
rank #737 in the tld
WOT: SAFE (93/100)
📈 Tranco rank: #22,674

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DNS History

6 records (6 active, 0 former)

A104.26.14.224104.26.15.224172.67.72.852606:4700:20::681a:ee02606:4700:20::681a:fe02606:4700:20::ac43:4855
●A104.26.14.2242026-03-06 → 2026-04-15 · 2 obs
● 2026-03-06 01:11:32
● 2026-04-15 22:51:58
●A104.26.15.2242026-03-06 → 2026-04-15 · 2 obs
● 2026-03-06 01:11:32
● 2026-04-15 22:51:58
●A172.67.72.852026-03-06 → 2026-04-15 · 2 obs
● 2026-03-06 01:11:32
● 2026-04-15 22:51:58
●A2606:4700:20::681a:ee02026-03-06 → 2026-04-15 · 2 obs
● 2026-03-06 01:11:32
● 2026-04-15 22:51:58
●A2606:4700:20::681a:fe02026-03-06 → 2026-04-15 · 2 obs
● 2026-03-06 01:11:32
● 2026-04-15 22:51:58
●A2606:4700:20::ac43:48552026-03-06 → 2026-04-15 · 2 obs
● 2026-03-06 01:11:32
● 2026-04-15 22:51:58

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
orgd0.org.afilias-nst.org, b0.org.afilias-nst.org, b2.org.afilias-nst.org-
opencv.orgstan.ns.cloudflare.com, nina.ns.cloudflare.com-

✅ Authoritative Response

Server:172.64.32.136

NS records: stan.ns.cloudflare.com, nina.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for opencv.org (unsigned zone)

⏱️ Timing

Total: 376ms | Queries: -

📄 Records

TypeCountSample Data
A3172.67.72.85, 104.26.15.224...
AAAA32606:4700:20::681a:fe0, 2606:4700:20::ac43:4855...
TXT1v=spf1 -all
HTTPS1{"priority":1,"target":".","alpn":["h3",

Analysis

IP Addresses

courses.opencv.org resolves to six IP addresses: 2606:4700:20::681a:ee0, 2606:4700:20::681a:fe0, 2606:4700:20::ac43:4855, 104.26.14.224, 104.26.15.224 and 172.67.72.85.

other host names including nordbariatric.com, fragrantica.jp, hotelagent.com, apple.com.manage.page.hotelagent.com and cttorjdddcds0eanso30.apple.com.manage.page.hotelagent.com share IP numbers with courses.opencv.org.