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.
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.104.116.24 |
| 🔶 Autoconfig | flow-elnet.dk → 104.21.30.223 |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| MS=ms65821938 |
| v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (sefnet.dk) |
|---|---|
| -all (hard fail) | v=spf1 include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.sefnet.dk) |
|---|---|
| p=reject | v=DMARC1; p=reject; adkim=s; aspf=s; |
| 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 |
| 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.
DNS lookups: 1/10 · policy: -all
No problems found| Type | Name | Value |
|---|---|---|
| CNAME | _acme-challenge.sefnet.dk | flow-elnet.dk |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | resolution failed: ncache nxrrset |
| Field | Value |
|---|---|
| Serial | 2026073101 |
| Primary NS (MNAME) | ns01.one.com |
| Responsible (RNAME) | hostmaster@one.com |
| Refresh | 14400s |
| Retry | 3600s |
| Expire | 1209600s |
| Minimum (neg-cache TTL) | 600s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2007-09-04 |
| Expires | 2027-09-30 (362d) |
| 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 shown | 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 | 2380ms | 2 NS 0 A 1 MX | 🔒 Secure |