fastmail.dk

📜 Historical scan 2026-06-17 09:25:23 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

fastmail.dk is a .dk domain served by 3 nameservers (ns5.chosting.dk, ns6.chosting.dk, ns7.chosting.dk). It was registered on 31 October 2014 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 178.20.216.20 is hosted by Atea A/S (AS21060) in Denmark. Mail is handled by mail.fastmail.dk. The zone is not DNSSEC-signed, 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#

3 records 89ms

Nameserver	IP addresses	PTR	ASN / ISP
ns5.chosting.dk	—	—	—
ns6.chosting.dk	—	—	—
ns7.chosting.dk	—	—	—

🌍 A Records#

1 records 91ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
178.20.216.20	—	server11.chosting.dk	AS21060	Atea A/S	178.20.216.0/23	🇩🇰 Denmark	—

📧 MX Records#

1 records 2090ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	—	mail.fastmail.dk	178.20.216.20	server11.chosting.dk	AS21060 Atea A/S

🔷 AAAA Records (IPv6)#

1 records 2098ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2a01:7cc0:101:ffff::1:8	—	—	AS21060	Atea A/S	2a01:7cc0:100:0:0:0:0:0/40	🇩🇰 Denmark	—

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

1 records 197ms

TXT Record
v=spf1 ip4:178.20.216.20 include:spf.chosting.dk +a +mx ~all

✉️ SPF#

Policy	Record (fastmail.dk)
~all (soft fail)	v=spf1 ip4:178.20.216.20 include:spf.chosting.dk +a +mx ~all

📨 DMARC#

Policy	Record (_dmarc.fastmail.dk)
p=none (monitor only)	v=DMARC1; p=none;

📬 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 2026-10-08 08:26:52

www CNAME	fastmail.dk (all on fastmail.dk) → 178.20.216.20 2a01:7cc0:101:ffff::1:8 (AS21060)
www vs bare domain	Same network fastmail.dk: 178.20.216.20 2a01:7cc0:101:ffff::1:8 (AS21060) www.fastmail.dk: 178.20.216.20 2a01:7cc0:101:ffff::1:8 (AS21060)
Wildcard	No

✍️ DKIM keys#

1 found

Selector	CNAME	Key
default	—	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: 5/10 · policy: ~all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

2103ms

Check	Result
Validation Status	🔓 Insecure
AD Flag (resolver validates)	✗ Not set
DS Record	✗ Not found
DNSKEY Record	✗ Not found
Flags	unsigned answer

🏷️ SOA#

84ms

Field	Value
Serial	2026051101
Primary NS (MNAME)	ns5.chosting.dk
Responsible (RNAME)	logs@chosting.dk
Refresh	3600s
Retry	1800s
Expire	1209600s
Minimum (neg-cache TTL)	86400s

📋 Registration#

WHOIS fetched 2026-10-10 11:10:12

Field	Value
Registrar	FIONIA IT ApS
Registered	2014-10-31
Expires	2027-10-31 (373d)

📋 WHOIS#

⏱️ Lookup Timing#

89ms

91ms

2090ms

AAAA

2098ms

TXT

197ms

CAA

2105ms

HTTPS

2087ms

TLSA

125ms

SOA

84ms

MTA-STS

39ms

DNSSEC

2103ms

SRV

0ms

Total

2679ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-08 08:26:52	636ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-30 13:27:29	957ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-30 09:58:15	594ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-28 03:29:38	642ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-16 10:58:11	1392ms	3 NS 1 A 1 MX	🔓 Insecure
2026-07-11 19:37:52	881ms	3 NS 1 A 1 MX	🔓 Insecure
2026-07-01 23:28:21	911ms	3 NS 1 A 1 MX	🔓 Insecure
2026-06-17 09:30:07	495ms	3 NS 1 A 1 MX	🔓 Insecure
2026-06-17 09:25:23 shown	2679ms	3 NS 1 A 1 MX	🔓 Insecure