onback.dk

📜 Historical scan 2026-06-25 21:09:22 · ← Latest scan

⬇ Zone File 📜 Timeline & History ⚡ Scan Now

onback.dk is a .dk domain served by 4 nameservers (ns1.simply.com, ns2.simply.com, ns3.simply.com and 1 more). It was registered on 3 February 2010 (WHOIS) and was already in the .dk zone when our tracking began on 16 June 2026. Mail is handled by onback-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#

4 records 83ms

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
ns4.simply.com	91.197.248.80	ns4.simply.com	AS48854 team.blue Denmark A/S

🌍 A Records#

🌍

No A records found

📧 MX Records#

1 records 115ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	3600s	onback-dk.mail.protection.outlook.com	2a01:111:f403:ca04::1 2a01:111:f403:ca04::c 2a01:111:f403:ca09::7 2a01:111:f403:ca09::b 52.101.68.12 52.101.68.21 52.101.73.26 52.101.73.28	mail-db7pr03cu00401.inbound.protection.outlook.com mail-db9pr02cu00204.inbound.protection.outlook.com mail-am9pr04cu00107.inbound.protection.outlook.com mail-am7pr05cu00103.inbound.protection.outlook.com mail-db9pr02cu00204.inbound.protection.outlook.com mail-db4pr02cu00205.inbound.protection.outlook.com mail-as9pr05cu01302.inbound.protection.outlook.com mail-am7pr05cu00204.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 → 52.98.154.152

🔷 AAAA Records (IPv6)#

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records#

✗ No HTTPS RR — no SVCB/HTTPS service binding

🔌 SRV Records#

1 records 114ms

Service	Priority	Weight	Port	Target
_sipfederationtls._tcp	100	1	5061	sipfed.online.lync.com

📝 TXT Records#

2 records 166ms

TXT Record
MS=ms58318355
v=spf1 include:spf.protection.outlook.com include:spf.simply.com -all

✉️ SPF#

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

📨 DMARC#

Policy	Record (_dmarc.onback.dk)
p=reject	v=DMARC1; p=reject; rua=mailto:dmarcreport@onback.dk; ruf=mailto:dmarcreport@onback.dk; 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 2026-10-13 03:30:37

www	93.191.156.143 (AS48854) (address records, no CNAME)
www vs bare domain	Same network onback.dk: 93.191.156.143 (AS48854) www.onback.dk: 93.191.156.143 (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-onback-dk._domainkey.onback.onmicrosoft.com	RSA · ~2048 bit
selector2	selector2-onback-dk._domainkey.onback.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: 2/10 · policy: -all

No problems found

🔗 TLSA / DANE#

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

🔐 DNSSEC#

206ms

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

🏷️ SOA#

81ms

Field	Value
Serial	2024042303
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 2026-10-17 13:11:18

Field	Value
Registrar	Punktum dk A/S (direct)
Registered	2010-02-03
Expires	2027-02-28 (133d)

🔗 Same registrant#

1 domain

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).

Domain	Registrar
lillesoegaard.dk	Punktum dk A/S (direct)

📋 WHOIS#

⏱️ Lookup Timing#

83ms

82ms

115ms

AAAA

30ms

TXT

166ms

CAA

75ms

HTTPS

43ms

TLSA

152ms

SOA

81ms

MTA-STS

110ms

DNSSEC

206ms

SRV

114ms

Total

857ms

🕐 Scan History#

Scanned At	Duration	Records	DNSSEC
2026-10-01 13:58:22	965ms	4 NS 1 A 1 MX	🔒 Secure
2026-09-24 12:46:37	926ms	4 NS 1 A 1 MX	🔒 Secure
2026-09-08 20:00:07	1038ms	4 NS 1 A 1 MX	🔒 Secure
2026-09-02 08:22:16	986ms	4 NS 1 A 1 MX	🔒 Secure
2026-07-11 15:51:33	1624ms	4 NS 1 A 1 MX	🔒 Secure
2026-06-28 11:17:49	1916ms	4 NS 0 A 1 MX	🔒 Secure
2026-06-25 21:09:22 shown	857ms	4 NS 0 A 1 MX	🔒 Secure
2026-06-25 08:51:50	858ms	4 NS 0 A 1 MX	🔒 Secure
2026-06-23 13:37:11	3461ms	4 NS 0 A 1 MX	🔒 Secure
2026-06-22 07:27:08	943ms	0 NS 0 A 0 MX	❓ Unknown
2026-06-18 06:14:59	1438ms	4 NS 0 A 1 MX	🔒 Secure