gdf.dk

📜 Historical scan 2026-09-07 11:03:51 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

gdf.dk is a .dk domain served by 2 nameservers (ivan.ns.cloudflare.com, janet.ns.cloudflare.com). It was registered on 30 April 2019 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.26.10.180 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by aspmx.l.google.com, aspmx3.googlemail.com and 3 more. The zone is DNSSEC-signed and validates, publishes a DMARC policy and is reachable over IPv6. Below are all of its DNS records from this scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.

🖥️ Nameservers#

2 records 28ms

Nameserver	IP addresses	PTR	ASN / ISP
ivan.ns.cloudflare.com	108.162.193.120 172.64.33.120 173.245.59.120 2606:4700:58::adf5:3b78 2803:f800:50::6ca2:c178 2a06:98c1:50::ac40:2178	ivan.ns.cloudflare.com ivan.ns.cloudflare.com ivan.ns.cloudflare.com ivan.ns.cloudflare.com ivan.ns.cloudflare.com ivan.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
janet.ns.cloudflare.com	108.162.192.169 172.64.32.169 173.245.58.169 2606:4700:50::adf5:3aa9 2803:f800:50::6ca2:c0a9 2a06:98c1:50::ac40:20a9	janet.ns.cloudflare.com janet.ns.cloudflare.com janet.ns.cloudflare.com janet.ns.cloudflare.com janet.ns.cloudflare.com janet.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records#

3 records 27ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.26.10.180	300s	—	AS13335	Cloudflare, Inc.	104.26.0.0/20	—	—
104.26.11.180	300s	—	AS13335	Cloudflare, Inc.	104.26.0.0/20	—	—
172.67.75.168	300s	—	AS13335	Cloudflare, Inc.	172.67.64.0/18	—	—

📧 MX Records#

5 records 26ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
1	300s	aspmx.l.google.com	2a00:1450:4010:c09::1a 2a00:1450:4010:c09::1a 64.233.164.26	lk-in-x1a.1e100.net lk-in-f26.1e100.net lf-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC
1	300s	aspmx3.googlemail.com	173.194.41.26 173.194.41.26 2404:6800:4001:c01::1b	yukulwh-in-f26.1e100.net mad01s14-in-f26.1e100.net yukulwh-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC
5	300s	alt1.aspmx.l.google.com	192.178.158.26 2404:6800:4013:813::1a	lcdels-in-f26.1e100.net lcdels-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC
5	300s	alt2.aspmx.l.google.com	173.194.41.26 173.194.41.26 2404:6800:4001:c01::1a	yukulwh-in-f26.1e100.net mad01s14-in-f26.1e100.net yukulwh-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC AS15169 Google LLC
10	300s	aspmx2.googlemail.com	192.178.158.26 2404:6800:4013:813::1a	lcdels-in-f26.1e100.net lcdels-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC

🔷 AAAA Records (IPv6)#

3 records 36ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:20::681a:ab4	300s	—	AS13335	Cloudflare, Inc.	2606:4700:0:0:0:0:0:0/41	—	—
2606:4700:20::681a:bb4	300s	—	AS13335	Cloudflare, Inc.	2606:4700:0:0:0:0:0:0/41	—	—
2606:4700:20::ac43:4ba8	300s	—	AS13335	Cloudflare, Inc.	2606:4700:0:0:0:0:0:0/41	—	—

🔐 HTTPS Records#

1 records 23ms

Priority	Target	SvcParams
1 service	.	alpn="h2" ipv4hint=104.26.10.180,104.26.11.180,172.67.75.168 ipv6hint=2606:4700:20::681a:ab4,2606:4700:20::681a:bb4,2606:4700:20::ac43:4ba8

📝 TXT Records#

2 records 147ms

TXT Record
google-site-verification=3-VchqQaA3gwjczy3dLrkXmiQQyegaFn-3sY37Powcs
v=spf1 mx ip4:185.223.26.234 include:sendgrid.net ~all

✉️ SPF#

Policy	Record (gdf.dk)
~all (soft fail)	v=spf1 mx ip4:185.223.26.234 include:sendgrid.net ~all

📨 DMARC#

Policy	Record (_dmarc.gdf.dk)
p=reject	v=DMARC1; p=reject; rua=mailto:acbac897ff1c48f9816a28a2bfc25632@dmarc-reports.cloudflare.net;

📬 MTA-STS#

✗ No MTA-STS policy — SMTP TLS not enforced

📈 TLSRPT#

✗ No TLSRPT record — no SMTP TLS failure reporting

📜 CAA Records#

✗ No CAA records — any CA may issue certificates

🧩 Web & zone#

latest probe, not this scan · checked 2026-10-14 04:17:19

www	104.26.10.180 104.26.11.180 172.67.75.168 2606:4700:20::681a:ab4 2606:4700:20::681a:bb4 2606:4700:20::ac43:4ba8 (AS13335) (address records, no CNAME)
www vs bare domain	Same network gdf.dk: 104.26.10.180 104.26.11.180 172.67.75.168 2606:4700:20::681a:ab4 (AS13335) www.gdf.dk: 104.26.10.180 104.26.11.180 172.67.75.168 2606:4700:20::681a:ab4 (AS13335)
Wildcard	No
Denial of existence	Compact NSEC (RFC 9824, "black lies") not walkable
CDS / CDNSKEY	Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY

✍️ DKIM keys#

1 found

Selector	CNAME	Key
google	—	RSA · ~2048 bit

DKIM selectors can't be listed, so we check the common ones (Microsoft 365, Google, Mailchimp, SendGrid, generic). Keys under other selectors aren't shown.

🔎 SPF check#

zone-wide SPF report

DNS lookups: 3/10 · policy: ~all

No problems found

🔏 ACME Challenge#

Type	Name	Value
TXT	_acme-challenge.gdf.dk	1htRrujtIprGQdIw56Zv_3J7Efpmymc_P84lWwFdC8U
TXT	_acme-challenge.gdf.dk	elZ2l0cqSZbzoG-BE7K_7ZjnGog0iQc-IshH0KuKEXI
TXT	_acme-challenge.gdf.dk	nyldY60v2uCCdRnlpkmvUPFP2daItTQ20kMzAcZ4AYI
TXT	_acme-challenge.gdf.dk	rKLocFgXWvOeYB0LhcspWfcFfFcI4kP6EuRm62NQ7Mg

🔗 TLSA / DANE#

✗ No TLSA records — DANE not configured for HTTPS (_443) or MX (_25)

🔐 DNSSEC#

94ms

Check	Result
Validation Status	🔒 Secure
AD Flag (resolver validates)	✓ Set
DS Record	✓ Found
DNSKEY Record	✓ Found
Flags	fully validated

🏷️ SOA#

0ms

Field	Value
Serial	2414194327
Primary NS (MNAME)	ivan.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-14 11:39:36

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2019-04-30
Expires	2031-04-30 (1654d)

🔗 Same registrant#

21 domains

Other .dk domains whose WHOIS registrant has the same name and postal address. Matched on a keyed hash: the registrant's details are not stored or shown. Covers only domains whose WHOIS we have fetched (refreshed about monthly).

Domain	Registrar
e-study.dk	Simply.com A/S
erdetstudenteruge.dk	Simply.com A/S
godekarakterer.dk	Simply.com A/S
grammatikbog.dk	Punktum dk A/S (direct)
guldnoter.dk	Punktum dk A/S (direct)
gymhjælpen.dk	Simply.com A/S
kildekritik.dk	Simply.com A/S
laerogleg.dk	Simply.com A/S
lektieportal.dk	Simply.com A/S
lærerstuderende.dk	Simply.com A/S
lærogleg.dk	Simply.com A/S
notenet.dk	Simply.com A/S
paedagogstuderende.dk	Simply.com A/S
rettenøgle.dk	Punktum dk A/S (direct)
schulhilfeverlag.dk	Simply.com A/S
skolehjaelpen.dk	Punktum dk A/S (direct)
srp-bog.dk	Simply.com A/S
srp-bogen.dk	Simply.com A/S
srpbog.dk	Simply.com A/S
studentmedia.dk	Simply.com A/S
studentmediagroup.dk	Simply.com A/S

📋 WHOIS#

⏱️ Lookup Timing#

28ms

27ms

26ms

AAAA

36ms

TXT

147ms

CAA

33ms

HTTPS

23ms

TLSA

127ms

SOA

0ms

MTA-STS

50ms

DNSSEC

94ms

SRV

56ms

Total

775ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-14 04:17:18	2672ms	2 NS 3 A 5 MX	🔒 Secure
2026-10-14 04:16:36	679ms	2 NS 3 A 5 MX	🔒 Secure
2026-10-01 17:01:15	3029ms	2 NS 3 A 5 MX	🔒 Secure
2026-09-30 16:46:41	735ms	2 NS 3 A 5 MX	🔒 Secure
2026-09-23 21:59:39	919ms	2 NS 3 A 5 MX	🔒 Secure
2026-09-18 03:03:15	1199ms	2 NS 3 A 5 MX	🔒 Secure
2026-09-11 12:49:27	1249ms	2 NS 3 A 5 MX	🔒 Secure
2026-09-07 11:03:51 shown	775ms	2 NS 3 A 5 MX	🔒 Secure
2026-08-28 09:16:22	2089ms	2 NS 3 A 5 MX	🔒 Secure
2026-08-26 21:40:10	765ms	2 NS 3 A 5 MX	🔒 Secure
2026-08-06 15:44:12	1582ms	2 NS 3 A 5 MX	🔒 Secure
2026-07-28 18:28:46	1491ms	2 NS 3 A 5 MX	🔒 Secure
2026-07-17 12:05:29	1321ms	2 NS 3 A 5 MX	🔒 Secure
2026-07-09 21:33:59	1278ms	2 NS 3 A 5 MX	🔒 Secure
2026-07-03 13:38:21	1370ms	2 NS 3 A 5 MX	🔒 Secure
2026-06-27 05:26:39	932ms	2 NS 3 A 5 MX	🔒 Secure
2026-06-26 08:35:22	2220ms	2 NS 3 A 5 MX	🔒 Secure
2026-06-24 14:56:22	2424ms	2 NS 3 A 5 MX	🔒 Secure
2026-06-21 09:33:12	2826ms	2 NS 3 A 5 MX	🔒 Secure
2026-06-19 08:55:37	1170ms	2 NS 3 A 5 MX	🔒 Secure
2026-06-17 10:16:49	3957ms	2 NS 3 A 5 MX	🔒 Secure