smtp.scienceguide.nl - robtex.com

smtp.scienceguide.nl

DNSSEC⚠️ Not signed
A2606:4700:3030::6815:3297🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3030::ac43:a3ee🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.50.151Cloudflare104.21.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.163.238🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.50.151, 172.67.163.238
IPv6 hints2606:4700:3030::6815:3297, 2606:4700:3030::ac43:a3ee
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=241, name=cloudflare-ech.com

scienceguide.nl

DNSSEC⚠️ Not signed
A2606:4700:3030::6815:3297🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3030::ac43:a3ee🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.50.151Cloudflare104.21.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.163.238🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSdoug.ns.cloudflare.com ⭐
NSmillie.ns.cloudflare.com
MXscienceguide-nl.mail.protection.outlook.com ⭐
TXTMS=ms15184806
TXTgoogle-site-verification=e3Cgnxnw0B0EbPJm8ZIUe6vf9-Qz08KsyK7buqDg2EI
TXTv=spf1 ip4:5.79.100.48 ip4:178.79.128.202 include:spf.protection.outlook.com ...
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.50.151, 172.67.163.238
IPv6 hints2606:4700:3030::6815:3297, 2606:4700:3030::ac43:a3ee
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=241, name=cloudflare-ech.com
SOAdoug.ns.cloudflare.comdns@cloudflare.com serial=2408754054
rank #127695 globally
rank #6266 in the tld
WOT: SAFE (60/100)
📈 Tranco rank: #423,503

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DNS History

8 records (4 active, 4 former)

201820192020202120222023202420252026A104.21.50.151172.67.163.2382606:4700:3030::6815:32972606:4700:3030::ac43:a3ee2606:4700:3035::ac43:a3ee2606:4700:3036::6815:32975.79.100.48PTR5.79.100.48
●A104.21.50.1512026-03-25 → 2026-07-19 · 3 obs
○ 2017-01-02 07:00:10
● 2026-03-25 13:27:56
● 2026-07-19 22:13:36
●A172.67.163.2382026-03-25 → 2026-07-19 · 3 obs
○ 2017-01-02 07:00:10
● 2026-03-25 13:27:56
● 2026-07-19 22:13:36
●A2606:4700:3030::6815:32972026-06-20 → 2026-07-19 · 3 obs
○ 2026-06-17 20:10:30
● 2026-06-20 15:18:54
● 2026-07-19 22:13:36
●A2606:4700:3030::ac43:a3ee2026-06-20 → 2026-07-19 · 3 obs
○ 2026-06-17 20:10:30
● 2026-06-20 15:18:54
● 2026-07-19 22:13:36
○A2606:4700:3035::ac43:a3ee2026-03-25 → 2026-06-17 · 5 obs
○ 2017-01-02 07:00:10
● 2026-03-25 13:27:56
● 2026-06-17 20:10:30
○ 2026-06-20 15:18:54
○ 2026-07-19 22:13:36
○A2606:4700:3036::6815:32972026-03-25 → 2026-06-17 · 5 obs
○ 2017-01-02 07:00:10
● 2026-03-25 13:27:56
● 2026-06-17 20:10:30
○ 2026-06-20 15:18:54
○ 2026-07-19 22:13:36
○A5.79.100.482017-01-02 → 2017-01-02 · 3 obs
● 2017-01-02 07:00:10
○ 2026-03-25 13:27:56
○ 2026-07-19 22:13:36
○PTR5.79.100.482017-01-02 → 2017-01-02 · 3 obs
● 2017-01-02 07:00:10
○ 2026-03-25 13:27:56
○ 2026-07-19 22:13:36

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
nlns1.dns.nl, ns3.dns.nl, ns4.dns.nl-
scienceguide.nldoug.ns.cloudflare.com, millie.ns.cloudflare.com-

✅ Authoritative Response

Server:172.64.33.159

NS records: doug.ns.cloudflare.com, millie.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for scienceguide.nl (unsigned zone)

⏱️ Timing

Total: 313ms | Queries: -

📄 Records

TypeCountSample Data
A2172.67.163.238, 104.21.50.151
AAAA22606:4700:3030::ac43:a3ee, 2606:4700:3030::6815:3297
HTTPS1{"priority":1,"target":".","alpn":["h3",

Analysis

IP Addresses

smtp.scienceguide.nl points to the four IP addresses 104.21.50.151, 172.67.163.238, 2606:4700:3030::6815:3297 and 2606:4700:3030::ac43:a3ee.

kagami.me, www.ss859.com, vibecheck.com plus two other host names have IP numbers in common with smtp.scienceguide.nl.