onback.dk DNS records

🖥️ Nameservers4 records 323ms

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 Records1 records 246ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	3600s	onback-dk.mail.protection.outlook.com	2a01:111:f403:ca04::7 2a01:111:f403:ca04::c 2a01:111:f403:ca04::e 2a01:111:f403:ca09::4 52.101.68.8 52.101.73.15 52.101.73.19 52.101.73.22	mail-db4pr02cu00307.inbound.protection.outlook.com mail-db9pr02cu00204.inbound.protection.outlook.com mail-db8pr02cu00106.inbound.protection.outlook.com mail-am0pr04cu00504.inbound.protection.outlook.com mail-du0pr03cu00100.inbound.protection.outlook.com mail-am9pr04cu00107.inbound.protection.outlook.com mail-as8pr04cu00803.inbound.protection.outlook.com mail-am7pr05cu00106.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 Records1 records 377ms

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

📝 TXT Records2 records 545ms

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

🔗 TLSA / DANE

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

🔐 DNSSEC442ms

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

🏷️ SOA258ms

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

✗ No registration data — collected automatically when SOA serial changes

📋 WHOIS

⏱️ Lookup Timing

NS

323ms

A

300ms

MX

246ms

AAAA

229ms

TXT

545ms

CAA

363ms

HTTPS

359ms

TLSA

317ms

SOA

258ms

MTA-STS

283ms

DNSSEC

442ms

SRV

377ms

Total

3461ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-09-02 08:22:16	986ms	4 NS 1 A 1 MX	🔒 Secure	View
2026-07-11 15:51:33	1624ms	4 NS 1 A 1 MX	🔒 Secure	View
2026-06-28 11:17:49	1916ms	4 NS 0 A 1 MX	🔒 Secure	View
2026-06-25 21:09:22	857ms	4 NS 0 A 1 MX	🔒 Secure	View
2026-06-25 08:51:50	858ms	4 NS 0 A 1 MX	🔒 Secure	View
2026-06-23 13:37:11	3461ms	4 NS 0 A 1 MX	🔒 Secure	View
2026-06-22 07:27:08	943ms	0 NS 0 A 0 MX	❓ Unknown	View
2026-06-18 06:14:59	1438ms	4 NS 0 A 1 MX	🔒 Secure	View