deff.dk

📜 Historical scan 2026-10-01 07:18:51  ·  ← Latest scan
⬇ Zone File 📜 Timeline & History ⚡ Scan Now

deff.dk is a .dk domain served by 2 nameservers (ns6.sitnet.dk, ns7.sitnet.dk). It was registered on 23 August 1999 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Its website address 82.103.135.52 is hosted by Asergo Holding ApS (AS30736) in Denmark. Mail is handled by barracuda.aub.aau.dk. 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   92ms
NameserverIP addressesPTRASN / ISP
ns6.sitnet.dk 107.162.234.197
2604:e180:1071::3:1		 —
—		 AS55002 F5, Inc.
AS55002 F5, Inc.
ns7.sitnet.dk 107.162.176.221
2604:e180:1071::ffff:6ba2:b0dd		 —
—		 AS55002 F5, Inc.
AS55002 F5, Inc.

🌍 A Records#

1 records   89ms
IPTTLPTRASNISP / OrgCIDRCountryCity
82.103.135.52 3600s e82-103-135-52s.cust.asergo.com AS30736 Asergo Holding ApS 82.103.128.0/18 🇩🇰 Denmark —

📧 MX Records#

1 records   107ms
PriorityTTLMail ServerIP addressesPTRASN
10 3600s barracuda.aub.aau.dk 130.225.53.23 barracuda.aub.aau.dk AS1835 FSKNET-DK Forskningsnettet - Danish network for Research and Education

📧 Autodiscover / Autoconfig#

ServiceCNAME / IP
🔷 Autodiscoverdeff.dk → 82.103.135.52
🔶 Autoconfigdeff.dk → 82.103.135.52

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records#

1 records   499ms
TXT Record
v=spf1 -all

✉️ SPF#

PolicyRecord (deff.dk)
-all (hard fail) v=spf1 -all

📨 DMARC#

PolicyRecord (_dmarc.deff.dk)
p=reject v=DMARC1; p=reject; sp=reject; rua=mailto:tcod1eh2@ag.eu.dmarcadvisor.com;

📬 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 2026-10-17 12:59:28
www CNAMEdeff.dk (all on deff.dk)
www vs bare domainSame network
deff.dk: 82.103.135.52 (AS30736)
www.deff.dk: 82.103.135.52 (AS30736)
WildcardYes: any name under the zone resolves
Denial of existenceNSEC3 · 10 iterations · 9-byte salt RFC 9276 recommends 0 iterations and no salt
CDS / CDNSKEYNone 0 CDS, 0 CDNSKEY

✍️ DKIM keys#

6 found
SelectorCNAMEKey
default — Revoked (empty key)
dkim — Revoked (empty key)
k1 — Revoked (empty key)
mail — Revoked (empty key)
s1 — Revoked (empty key)
s2 — Revoked (empty key)

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: 0/10 · policy: -all

No problems found

🔏 ACME Challenge#

TypeNameValue
CNAME _acme-challenge.deff.dk deff.dk

🔗 TLSA / DANE#

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

🔐 DNSSEC#

126ms
CheckResult
Validation Status🔒 Secure
AD Flag (resolver validates)✓ Set
DS Record✓ Found
DNSKEY Record✓ Found
Flagsfully validated

🏷️ SOA#

186ms
FieldValue
Serial12319
Primary NS (MNAME)ns6.sitnet.dk
Responsible (RNAME)hostmaster@statens-it.dk
Refresh10800s
Retry1080s
Expire2419200s
Minimum (neg-cache TTL)300s

📋 Registration#

WHOIS fetched 2026-10-13 03:53:32
FieldValue
RegistrarPunktum dk A/S (direct)
Registered1999-08-23
Expires2027-09-30 (347d)

🔗 Same registrant#

1,789 domains

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).

DomainRegistrar
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aaop.dkPunktum dk A/S (direct)
aapost.dkPunktum dk A/S (direct)
academycouncil.dkPunktum dk A/S (direct)
addom.dkPunktum dk A/S (direct)
adfaerdsprincipper.dkPunktum dk A/S (direct)
adfærdsprincipper.dkPunktum dk A/S (direct)
adgangforalle.dkPunktum dk A/S (direct)
adressebrug.dkPunktum dk A/S (direct)
adresseret.dkPunktum dk A/S (direct)
adressetip.dkPunktum dk A/S (direct)
aeldre.dkPunktum dk A/S (direct)
aeldreform.dkPunktum dk A/S (direct)
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aeldrereform.dkPunktum dk A/S (direct)
aeldrereformen.dkPunktum dk A/S (direct)
affaldssorteringnytter.dkPunktum dk A/S (direct)
aflk.dkStatens It
ai-test.dkPunktum dk A/S (direct)
airpassenger.dkPunktum dk A/S (direct)
akademiraadet.dkPunktum dk A/S (direct)
akkr.dkPunktum dk A/S (direct)
alderstjek.dkPunktum dk A/S (direct)
aldersverifikation.dkPunktum dk A/S (direct)
aldertjek.dkPunktum dk A/S (direct)
alt-id.dkPunktum dk A/S (direct)
altid.dkStatens It
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altomkaeledyr.dkPunktum dk A/S (direct)
altomkæledyr.dkPunktum dk A/S (direct)
ambassade.dkPunktum dk A/S (direct)
ambassadeoversigt.dkPunktum dk A/S (direct)
amff.dkPunktum dk A/S (direct)
ami.dkPunktum dk A/S (direct)
amid.dkPunktum dk A/S (direct)
amkom.dkPunktum dk A/S (direct)
amr.dkPunktum dk A/S (direct)
anke-energi.dkPunktum dk A/S (direct)
ankl.dkPunktum dk A/S (direct)
anklagemyndighedenupdate.dkPunktum dk A/S (direct)
anklagerupdate.dkPunktum dk A/S (direct)
anskaffelsesguiden.dkPunktum dk A/S (direct)
antennedatabase.dkPunktum dk A/S (direct)
antennedatabasen.dkPunktum dk A/S (direct)
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antennerneude.dkPunktum dk A/S (direct)
appollon.dkPunktum dk A/S (direct)
arbejdsmarkedsbalancen.dkPunktum dk A/S (direct)
arbejdsmarkedskommissionen.dkPunktum dk A/S (direct)
arbejdsmiljo.dkPunktum dk A/S (direct)
arbejdsmiljoeprisen.dkPunktum dk A/S (direct)
arbejdsmiljoviden.dkPunktum dk A/S (direct)
arbejdsretten.dkPunktum dk A/S (direct)
arbejdstilsynet.dkPunktum dk A/S (direct)
artikelimportborger.dkPunktum dk A/S (direct)
artisticresearch.dkPunktum dk A/S (direct)
artportalen.dkPunktum dk A/S (direct)
arts-portal.dkPunktum dk A/S (direct)
artsdata.dkPunktum dk A/S (direct)
at-cloud.dkPunktum dk A/S (direct)
at-kørebog.dkPunktum dk A/S (direct)
at.dkPunktum dk A/S (direct)
atbm-cloud.dkPunktum dk A/S (direct)
atkoerebog.dkPunktum dk A/S (direct)
atkorebog.dkPunktum dk A/S (direct)
atkørebog.dkPunktum dk A/S (direct)
atp-anke.dkPunktum dk A/S (direct)
autorisationsregister.dkPunktum dk A/S (direct)
autorisationsregisteret.dkPunktum dk A/S (direct)
autorisationsregistret.dkPunktum dk A/S (direct)
autreg.dkPunktum dk A/S (direct)
b0rger.dkPunktum dk A/S (direct)
babykemi.dkPunktum dk A/S (direct)
baeb.dkPunktum dk A/S (direct)
baebm.dkPunktum dk A/S (direct)
bdktest.dkPunktum dk A/S (direct)
bedreinnovation.dkPunktum dk A/S (direct)
bedst-paa-nettet.dkPunktum dk A/S (direct)
bedstpaanettet.dkPunktum dk A/S (direct)
bedstpånettet.dkPunktum dk A/S (direct)
beredskabsministeriet.dkPunktum dk A/S (direct)
beredskabsuge.dkPunktum dk A/S (direct)
beredskabsugen.dkPunktum dk A/S (direct)
beskyttedenaturtyper.dkPunktum dk A/S (direct)
bestillingsapplikation.dkPunktum dk A/S (direct)
bfmp.dkPunktum dk A/S (direct)
bibliotekernesprojektbank.dkPunktum dk A/S (direct)
bibliotekogmedier.dkPunktum dk A/S (direct)
biblioteksstyrelsen.dkPunktum dk A/S (direct)

Showing 100 of 1,789.

📋 WHOIS#

⏱️ Lookup Timing#

NS
92ms
A
89ms
MX
107ms
AAAA
82ms
TXT
499ms
CAA
95ms
HTTPS
97ms
TLSA
182ms
SOA
186ms
MTA-STS
146ms
DNSSEC
126ms
SRV
206ms
Total
5378ms

🕐 Scan History#

Scanned AtDurationRecordsDNSSEC
2026-10-17 12:59:28 1039ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-16 12:48:01 4878ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-15 05:29:05 19845ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-14 04:00:18 5556ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-13 03:41:29 18671ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-12 03:29:18 1509ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-11 01:15:54 4625ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-09 19:26:19 18833ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-08 14:47:10 18478ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-07 14:41:52 18409ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-06 14:17:04 4993ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-05 08:00:16 18127ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-04 07:26:51 18568ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-03 07:23:45 1325ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-02 07:22:41 2877ms 2 NS 1 A 1 MX 🔒 Secure
2026-10-01 07:18:51 shown 5378ms 2 NS 1 A 1 MX 🔒 Secure
2026-09-30 09:55:22 5306ms 2 NS 1 A 1 MX 🔒 Secure
2026-09-29 11:50:20 18465ms 2 NS 1 A 1 MX 🔒 Secure
2026-09-28 11:45:10 17391ms 2 NS 1 A 1 MX 🔒 Secure
2026-09-27 11:33:14 5006ms 2 NS 1 A 1 MX 🔒 Secure
2026-09-26 20:18:41 9528ms 2 NS 1 A 1 MX 🔒 Secure
2026-09-25 20:11:15 17270ms 2 NS 1 A 1 MX 🔒 Secure
2026-09-24 19:56:15 18314ms 2 NS 1 A 1 MX 🔒 Secure
2026-09-23 18:58:40 1532ms 2 NS 1 A 1 MX 🔒 Secure
2026-09-22 16:04:16 9565ms 2 NS 1 A 1 MX 🔒 Secure
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