sefnet.dk

📜 Historical scan 2026-06-17 16:13:45 · ← Latest scan

sefnet.dk is a .dk domain served by 2 nameservers (ns01.one.com, ns02.one.com). It was registered on 4 September 2007 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by sefnet-dk.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, 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

2 records 168ms

Nameserver	IP addresses	PTR	ASN / ISP
ns01.one.com	195.206.121.10 2001:67c:28cc::10	ns01.one.com ns01.one.com	AS197495 One.com A/S AS197495 One.com A/S
ns02.one.com	185.10.11.10 2001:67c:3c0::10	ns02.one.com ns02.one.com	AS51468 One.com A/S AS51468 One.com A/S

🌍 A Records

🌍

No A records found

📧 MX Records

1 records 184ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
0	—	sefnet-dk.mail.protection.outlook.com	2a01:111:f403:ca04::4 2a01:111:f403:ca04::9 2a01:111:f403:ca09::2 2a01:111:f403:ca09::b 52.101.68.25 52.101.68.3 52.101.68.39 52.101.68.8	mail-db4pr02cu00204.inbound.protection.outlook.com mail-db7pr03cu00601.inbound.protection.outlook.com mail-am0pr83cu00402.inbound.protection.outlook.com mail-am7pr05cu00103.inbound.protection.outlook.com mail-db8pr02cu00101.inbound.protection.outlook.com mail-db7pr03cu00403.inbound.protection.outlook.com mail-db7pr03cu00607.inbound.protection.outlook.com mail-du0pr03cu00100.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

🔷 AAAA Records (IPv6)

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records

2 records 350ms

TXT Record
MS=ms65821938
v=spf1 include:spf.protection.outlook.com -all

✉️ SPF

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

📨 DMARC

Policy	Record (_dmarc.sefnet.dk)
p=reject	v=DMARC1; p=reject; adkim=s; aspf=s;

📬 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 2026-10-02 13:30:40

www CNAME	flow-elnet.dk (all on flow-elnet.dk)
Wildcard	Yes: any name under the zone resolves
CDS / CDNSKEY	None 0 CDS, 0 CDNSKEY

✍️ DKIM keys

1 found

Selector	CNAME	Key
selector1	selector1-sefnet-dk._domainkey.sef5700.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

🔗 TLSA / DANE

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

🔐 DNSSEC

383ms

Check	Result
Validation Status	🔒 Secure
AD Flag (resolver validates)	✓ Set
DS Record	✓ Found
DNSKEY Record	✓ Found
Flags	resolution failed: ncache nxrrset

🏷️ SOA

199ms

Field	Value
Serial	2026053101
Primary NS (MNAME)	ns01.one.com
Responsible (RNAME)	hostmaster@one.com
Refresh	14400s
Retry	3600s
Expire	1209600s
Minimum (neg-cache TTL)	600s

📋 Registration

WHOIS fetched 2026-10-02 14:05:32

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2007-09-04
Expires	2027-09-30 (362d)

📋 WHOIS

⏱️ Lookup Timing

168ms

233ms

184ms

AAAA

219ms

TXT

350ms

CAA

139ms

HTTPS

222ms

TLSA

329ms

SOA

199ms

MTA-STS

253ms

DNSSEC

383ms

SRV

0ms

Total

2380ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-10-02 13:30:40	1052ms	2 NS 0 A 1 MX	🔒 Secure
2026-09-30 13:24:30	816ms	2 NS 0 A 1 MX	🔒 Secure
2026-09-24 03:06:13	883ms	2 NS 0 A 1 MX	🔒 Secure
2026-09-06 10:49:54	1736ms	2 NS 0 A 1 MX	🔒 Secure
2026-08-27 19:26:39	1026ms	2 NS 0 A 1 MX	🔒 Secure
2026-08-26 10:04:29	1363ms	2 NS 0 A 1 MX	🔒 Secure
2026-08-17 20:34:38	5183ms	2 NS 0 A 1 MX	🔒 Secure
2026-08-02 01:44:05	1282ms	2 NS 0 A 1 MX	🔒 Secure
2026-07-18 22:55:22	5271ms	2 NS 0 A 1 MX	🔒 Secure
2026-07-03 10:50:01	730ms	2 NS 0 A 1 MX	🔒 Secure
2026-06-26 22:43:06	3007ms	2 NS 0 A 1 MX	🔒 Secure
2026-06-26 07:25:35	1081ms	2 NS 0 A 1 MX	🔒 Secure
2026-06-25 17:37:53	2735ms	2 NS 0 A 1 MX	🔒 Secure
2026-06-23 23:06:33	1190ms	2 NS 0 A 1 MX	🔒 Secure
2026-06-21 05:57:19	1036ms	0 NS 0 A 0 MX	❓ Unknown
2026-06-21 03:59:16	965ms	0 NS 0 A 0 MX	❓ Unknown
2026-06-17 16:13:45 shown	2380ms	2 NS 0 A 1 MX	🔒 Secure