sostrom.dk

📜 Historical scan 2026-10-04 09:48:35 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

sostrom.dk is a .dk domain served by 3 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com). It was registered on 21 November 2007 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 185.21.42.34 is hosted by team.blue Denmark A/S (AS48854) in Denmark. Mail is handled by sostrom-dk.mail.protection.outlook.com. The zone is not DNSSEC-signed, publishes a DMARC policy and has no IPv6 address. 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 152ms

Nameserver	IP addresses	PTR	ASN / ISP
ns1.simply.com	2a02:2339:1:15c::4562:4562 91.197.248.78	ns1.simply.com ns1.simply.com	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S
ns2.simply.com	185.25.141.15 2a02:2339:4006:101::4562:4562	ns2.simply.com ns2.simply.com	AS48854 team.blue Denmark A/S AS48854 team.blue Denmark A/S
ns3.simply.com	91.197.248.79	ns3.simply.com	AS48854 team.blue Denmark A/S

🌍 A Records#

1 records 88ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
185.21.42.34	3600s	linux35.curanet.dk	AS48854	team.blue Denmark A/S	185.21.40.0/22	🇩🇰 Denmark	—

📧 MX Records#

1 records 161ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	3600s	sostrom-dk.mail.protection.outlook.com	2a01:111:f403:ca04::9 2a01:111:f403:ca04::f 2a01:111:f403:ca09::26 2a01:111:f403:ca48::e 52.101.103.140 52.101.103.39 52.101.91.153 52.101.91.156	mail-db7pr03cu00601.inbound.protection.outlook.com mail-db7pr03cu00507.inbound.protection.outlook.com mail-am8pr83cu00106.inbound.protection.outlook.com mail-miypr03cu00206.inbound.protection.outlook.com mail-miypr02cu00204.inbound.protection.outlook.com mail-miypr05cu00207.inbound.protection.outlook.com mail-matpr04cu00101.inbound.protection.outlook.com mail-maspr04cu00104.inbound.protection.outlook.com	AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation AS8075 Microsoft Corporation

📧 Autodiscover / Autoconfig#

Service	CNAME / IP
🔷 Autodiscover	autodiscover.outlook.com → 52.98.154.136
🔶 Autoconfig	sostrom.dk → 185.21.42.34

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

1 records 304ms

Service	Priority	Weight	Port	Target
_sipfederationtls._tcp	10	1	5061	sipfed.online.lync.com

📝 TXT Records#

1 records 416ms

TXT Record
v=spf1 include:spf.protection.outlook.com -all

✉️ SPF#

Policy	Record (sostrom.dk)
-all (hard fail)	v=spf1 include:spf.protection.outlook.com -all

📨 DMARC#

Policy	Record (_dmarc.sostrom.dk)
p=reject	v=DMARC1; p=reject; rua=mailto:roez1anr3i@rua.powerdmarc.com; ruf=mailto:roez1anr3i@ruf.powerdmarc.com; fo=1;

📬 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 2026-10-12 23:14:46

www CNAME	sostrom.dk (all on sostrom.dk) → 185.21.42.34 (AS48854)
www vs bare domain	Same network sostrom.dk: 185.21.42.34 (AS48854) www.sostrom.dk: 185.21.42.34 (AS48854)
Wildcard	Yes: any name under the zone resolves
Denial of existence	NSEC zone can be walked (all names enumerable)
CDS / CDNSKEY	Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY

✍️ DKIM keys#

2 found

Selector	CNAME	Key
selector1	selector1-sostrom-dk._domainkey.sostrom.onmicrosoft.com	RSA · ~1024 bit below 2048 bit
selector2	selector2-sostrom-dk._domainkey.sostrom.onmicrosoft.com	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: 1/10 · policy: -all

No problems found

🔏 ACME Challenge#

Type	Name	Value
CNAME	_acme-challenge.sostrom.dk	sostrom.dk

🔗 TLSA / DANE#

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

🔐 DNSSEC#

342ms

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

🏷️ SOA#

85ms

Field	Value
Serial	2026100300
Primary NS (MNAME)	ns1.simply.com
Responsible (RNAME)	hostmaster@simply.com
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	3600s

📋 Registration#

WHOIS fetched 2026-10-04 10:37:55

Field	Value
Registrar	Simply.com A/S
Registered	2007-11-21
Expires	2026-11-30 (42d)

📋 WHOIS#

⏱️ Lookup Timing#

152ms

88ms

161ms

AAAA

91ms

TXT

416ms

CAA

171ms

HTTPS

149ms

TLSA

830ms

SOA

85ms

MTA-STS

190ms

DNSSEC

342ms

SRV

304ms

Total

2308ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-12 23:14:46	1394ms	3 NS 1 A 1 MX	🔓 Insecure
2026-10-04 09:48:35 shown	2308ms	3 NS 1 A 1 MX	🔓 Insecure
2026-09-10 05:14:43	812ms	3 NS 1 A 1 MX	🔓 Insecure
2026-06-21 14:44:13	972ms	3 NS 1 A 1 MX	🔓 Insecure
2026-06-17 15:32:54	888ms	3 NS 1 A 1 MX	🔓 Insecure