sischool.dk is a .dk domain served by 2 nameservers (bella.ns.cloudflare.com, mark.ns.cloudflare.com). It was registered on 12 October 2012 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 104.21.4.105 is hosted by Cloudflare, Inc. (AS13335). Mail is handled by sischool-dk.mail.protection.outlook.com. The zone is DNSSEC-signed and validates, 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.
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 104.21.4.105 | — | — | AS13335 | Cloudflare, Inc. | 104.21.0.0/17 | — | — |
| 172.67.131.252 | — | — | AS13335 | Cloudflare, Inc. | 172.67.128.0/17 | — | — |
| Service | CNAME / IP |
|---|---|
| 🔷 Autodiscover | autodiscover.outlook.com → 40.99.218.152 |
| IPv6 Address | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 2606:4700:3030::6815:469 | — | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| 2606:4700:3035::ac43:83fc | — | — | AS13335 | Cloudflare, Inc. | 2606:4700:3000:0:0:0:0:0/42 | — | — |
| Priority | Target | SvcParams |
|---|---|---|
| 1 service | . | alpn="h3,h2" ipv4hint=104.21.4.105,172.67.131.252 ech=AEX+DQBBUgAgACBikhzZAr7Rk2pMlFm723zwb2k97MV6NY84MH+YnyTnJgAEAAEAAQASY2xvdWRmbGFyZS1lY2guY29tAAA= ipv6hint=2606:4700:3030::6815:469,2606:4700:3035::ac43:83fc |
| Service | Priority | Weight | Port | Target |
|---|---|---|---|---|
| _sipfederationtls._tcp | 100 | 1 | 5061 | sipfed.online.lync.com |
| TXT Record |
|---|
| /cV6bvF8GaGBFcimvt59mbrF3ybF6TRj8YA85I+kEeA= |
| cisco-ci-domain-verification=6a9fcc392afd82be6778242246366368cdf4c2d5d7f7fd7aa5fac5c9d1107c42 |
| K+FILDvfV1WjW7VwdQKwiLWde1imO8sIDgFu/zFo27+G0t8G1rZ3l6vhpoyFA1lqz+IyTbEG2gUD9gChDlq/Xw== |
| MS=ms76582345 |
| uvmid=280202 |
| v=spf1 ip4:46.32.40.41 ip4:94.138.76.52 ip4:94.138.76.44 ip4:89.184.150.166 ip4:94.138.77.92 ip4:94.138.76.180 ip4:212.37.142.20 ip4:212.37.142.28 ip4:89.221.167.132 ip4:185.16.17.219 ip4:185.16.17.220 ip4:195.231.242.115 ip4:40.118.61.36 a:massmail.scannet.dk include:spf.protection.outlook.com -all |
| Policy | Record (sischool.dk) |
|---|---|
| -all (hard fail) | v=spf1 ip4:46.32.40.41 ip4:94.138.76.52 ip4:94.138.76.44 ip4:89.184.150.166 ip4:94.138.77.92 ip4:94.138.76.180 ip4:212.37.142.20 ip4:212.37.142.28 ip4:89.221.167.132 ip4:185.16.17.219 ip4:185.16.17.220 ip4:195.231.242.115 ip4:40.118.61.36 a:massmail.scannet.dk include:spf.protection.outlook.com -all |
| Policy | Record (_dmarc.sischool.dk) |
|---|---|
| p=none (monitor only) | v=DMARC1;p=none;sp=reject;pct=100;rua=mailto:DMARC@sischool.dk;ruf=mailto:DMARC@sischool.dk;ri=86400;aspf=r;adkim=r;fo=1 |
| www | 104.21.4.105 172.67.131.252 2606:4700:3030::ac43:83fc 2606:4700:3033::6815:469 (AS13335) (address records, no CNAME) |
| www vs bare domain | Same network sischool.dk: 104.21.4.105 172.67.131.252 2606:4700:3030::ac43:83fc 2606:4700:3033::6815:469 (AS13335) www.sischool.dk: 104.21.4.105 172.67.131.252 2606:4700:3030::ac43:83fc 2606:4700:3033::6815:469 (AS13335) |
| Wildcard | No |
| Denial of existence | Compact NSEC (RFC 9824, "black lies") not walkable |
| CDS / CDNSKEY | Published: key rollovers can be automated with the registry (RFC 7344/8078) 1 CDS, 1 CDNSKEY |
| Selector | CNAME | Key |
|---|---|---|
| selector1 | selector1-sischool-dk._domainkey.elevcampus.onmicrosoft.com | RSA · ~1024 bit below 2048 bit |
| selector2 | selector2-sischool-dk._domainkey.elevcampus.onmicrosoft.com | 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.
DNS lookups: 2/10 · policy: -all
No problems found| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2406271170 |
| Primary NS (MNAME) | bella.ns.cloudflare.com |
| Responsible (RNAME) | dns@cloudflare.com |
| Refresh | 10000s |
| Retry | 2400s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 1800s |
| Field | Value |
|---|---|
| Registrar | Punktum dk A/S (direct) |
| Registered | 2012-10-12 |
| Expires | 2027-10-31 (372d) |
Other .dk domains whose WHOIS registrant has the same name and postal address. Matched on a keyed hash: the registrant's details are not stored or shown. Covers only domains whose WHOIS we have fetched (refreshed about monthly).
No other domain with this registrant in our WHOIS data yet| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-22 16:23:51 | 696ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-10-04 00:10:27 | 1294ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-29 23:46:50 | 969ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-26 22:50:03 | 826ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-16 08:25:57 | 1690ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-09-05 13:51:52 | 1366ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-08-12 10:13:17 | 1622ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-08-05 21:57:40 | 3311ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-07-20 05:43:31 | 9372ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-07-19 00:10:21 | 1405ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-26 17:40:16 | 1049ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-25 13:59:54 | 1144ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-20 17:04:15 | 1955ms | 2 NS 2 A 1 MX | 🔒 Secure |
| 2026-06-18 02:11:34 shown | 1230ms | 2 NS 2 A 1 MX | 🔒 Secure |