poscentrum.dk

📜 Historical scan 2026-08-09 07:18:50 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

poscentrum.dk is a .dk domain served by 2 nameservers (summer.ns.cloudflare.com, yisroel.ns.cloudflare.com). It was registered on 23 April 2015 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.9.237 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by aspmx.l.google.com, alt1.aspmx.l.google.com and 3 more. 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#

2 records 64ms

Nameserver	IP addresses	PTR	ASN / ISP
summer.ns.cloudflare.com	108.162.194.9 162.159.38.9 172.64.34.9 2606:4700:50::a29f:2609 2803:f800:50::6ca2:c209 2a06:98c1:50::ac40:2209	summer.ns.cloudflare.com summer.ns.cloudflare.com summer.ns.cloudflare.com summer.ns.cloudflare.com summer.ns.cloudflare.com summer.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
yisroel.ns.cloudflare.com	108.162.195.185 162.159.44.185 172.64.35.185 2606:4700:58::a29f:2cb9 2803:f800:50::6ca2:c3b9 2a06:98c1:50::ac40:23b9	yisroel.ns.cloudflare.com yisroel.ns.cloudflare.com yisroel.ns.cloudflare.com yisroel.ns.cloudflare.com yisroel.ns.cloudflare.com yisroel.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records#

2 records 72ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.21.9.237	300s	—	AS13335	Cloudflare, Inc.	104.21.0.0/17	—	—
172.67.131.18	300s	—	AS13335	Cloudflare, Inc.	172.67.128.0/17	—	—

📧 MX Records#

5 records 42ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
1	300s	aspmx.l.google.com	2a00:1450:4010:c01::1b 2a00:1450:4010:c01::1b 64.233.163.26	lh-in-x1b.1e100.net lh-in-f27.1e100.net lj-in-f26.1e100.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	alt3.aspmx.l.google.com	172.253.158.26 2404:6800:4003:c26::1b	so-in-f26.1e100.net so-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
10	300s	alt4.aspmx.l.google.com	108.177.125.26 2404:6800:4008:c01::1a	tp-in-f26.1e100.net tp-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC

🔷 AAAA Records (IPv6)#

2 records 51ms

IPv6 Address	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
2606:4700:3030::6815:9ed	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—
2606:4700:3034::ac43:8312	300s	—	AS13335	Cloudflare, Inc.	2606:4700:3000:0:0:0:0:0/42	—	—

🔐 HTTPS Records#

1 records 50ms

Priority	Target	SvcParams
1 service	.	alpn="h3,h2" ipv4hint=104.21.9.237,172.67.131.18 ech=AEX+DQBBZgAgACAYdmgCkTsa2PgYW+zQSDaSnvysI4SnvjOrK1NFqHx9DAAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:9ed,2606:4700:3034::ac43:8312

📝 TXT Records#

4 records 278ms

TXT Record
v = spf1 ip4: 185.99.128.0/22 mx
v = spf1 ip4: 213.189.0.0/23 mx
v=spf1 +a +mx ip4:136.244.102.136 include:relay.mailchannels.net include:_spf.google.com include:spf.multisafepay.com ~all
v=spf1 include:_spf.google.com ~all

✉️ SPF#

⚠ Multiple SPF records — RFC 7208 §4.5 violation (receivers must treat this as permerror)

Policy	Record (poscentrum.dk)
~all (soft fail)	v=spf1 +a +mx ip4:136.244.102.136 include:relay.mailchannels.net include:_spf.google.com include:spf.multisafepay.com ~all
~all (soft fail)	v=spf1 include:_spf.google.com ~all

📨 DMARC#

Policy	Record (_dmarc.poscentrum.dk)
p=none (monitor only)	v=DMARC1; p=none;
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 2026-10-13 00:05:53

www	104.21.9.237 172.67.131.18 2606:4700:3030::6815:9ed 2606:4700:3034::ac43:8312 (AS13335) (address records, no CNAME)
www vs bare domain	Same network poscentrum.dk: 104.21.9.237 172.67.131.18 2606:4700:3030::6815:9ed 2606:4700:3034::ac43:8312 (AS13335) www.poscentrum.dk: 104.21.9.237 172.67.131.18 2606:4700:3030::6815:9ed 2606:4700:3034::ac43:8312 (AS13335)
Wildcard	No

✍️ DKIM keys#

3 found

Selector	CNAME	Key
default	—	RSA · ~2048 bit
s1	s1.domainkey.u6036373.wl124.sendgrid.net	RSA · ~2048 bit
s2	s2.domainkey.u6036373.wl124.sendgrid.net	RSA · ~1024 bit below 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

error 2 SPF records: receivers must treat that as a permanent error (RFC 7208 §4.5)

🔗 TLSA / DANE#

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

🔐 DNSSEC#

110ms

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

🏷️ SOA#

0ms

Field	Value
Serial	2411659067
Primary NS (MNAME)	summer.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration#

WHOIS fetched 2026-10-06 12:15:50

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2015-04-23
Expires	2027-04-30 (194d)

📋 WHOIS#

⏱️ Lookup Timing#

64ms

72ms

42ms

AAAA

51ms

TXT

278ms

CAA

48ms

HTTPS

50ms

TLSA

98ms

SOA

0ms

MTA-STS

64ms

DNSSEC

110ms

SRV

87ms

Total

1819ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-06 12:11:39	3227ms	2 NS 2 A 5 MX	🔓 Insecure
2026-09-30 09:54:56	733ms	2 NS 2 A 5 MX	🔓 Insecure
2026-08-09 07:18:50 shown	1819ms	2 NS 2 A 5 MX	🔓 Insecure
2026-07-21 09:25:38	17308ms	6 NS 1 A 5 MX	🔓 Insecure
2026-07-19 15:55:49	1639ms	6 NS 1 A 5 MX	🔓 Insecure
2026-06-30 03:05:23	1130ms	4 NS 2 A 5 MX	🔓 Insecure
2026-06-24 08:19:46	1613ms	4 NS 2 A 5 MX	❓ Unknown
2026-06-17 16:42:07	1478ms	4 NS 2 A 5 MX	🔓 Insecure