rfsu.dk DNS records

🖥️ Nameservers2 records 48ms

Nameserver	IP addresses	PTR	ASN / ISP
dns-b.buildit.net	162.219.54.140 2620:10a:80eb::4c	dns-b.buildit.net dns-b.buildit.net	AS55195 CIRA Canadian Internet Registration Authority Autorit Canadienne pour les enregistrements In AS55195 CIRA Canadian Internet Registration Authority Autorit Canadienne pour les enregistrements In
dns-c.buildit.eu	162.219.55.140 2620:10a:80ec::4c	dns-c.buildit.eu dns-c.buildit.eu	AS394354 CIRA Canadian Internet Registration Authority Autorit Canadienne pour les enregistrements I AS394354 CIRA Canadian Internet Registration Authority Autorit Canadienne pour les enregistrements I

🌍 A Records1 records 53ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
213.88.149.101	3600s	rfsu25.bldt.dev	AS1257	Tele2 SWIPnet	213.88.128.0/17	🇸🇪 Sweden	Mariestad

📧 MX Records1 records 53ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	3600s	rfsu-dk.mail.protection.outlook.com	2a01:111:f403:ca04:: 2a01:111:f403:ca04::1 2a01:111:f403:ca09::1 2a01:111:f403:ca09::4 52.101.68.12 52.101.68.15 52.101.68.32 52.101.73.12	mail-db3pr0202cu00100.inbound.protection.outlook.com mail-db7pr03cu00401.inbound.protection.outlook.com mail-as9pr07cu00301.inbound.protection.outlook.com mail-am0pr04cu00504.inbound.protection.outlook.com mail-db9pr02cu00204.inbound.protection.outlook.com mail-db6pr03cu00107.inbound.protection.outlook.com mail-db3pr0202cu00200.inbound.protection.outlook.com mail-am4pr0401cu00104.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 → 40.98.16.77

🔷 AAAA Records (IPv6)

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records2 records 314ms

TXT Record
MS=ms48811067
v=spf1 include:spf.protection.outlook.com include:spf.eu.exclaimer.net -all

✉️ SPF

Policy	Record (rfsu.dk)
-all (hard fail)	v=spf1 include:spf.protection.outlook.com include:spf.eu.exclaimer.net -all

📨 DMARC

Policy	Record (_dmarc.rfsu.dk)
p=reject	v=DMARC1;p=reject;sp=reject;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)

🔐 DNSSEC124ms

Check	Result
Validation Status	🔓 Insecure
AD Flag (resolver validates)	✗ Not set
DS Record	✗ Not found
DNSKEY Record	✗ Not found
Flags	unsigned answer

🏷️ SOA86ms

Field	Value
Serial	2026012202
Primary NS (MNAME)	dns-b.buildit.net
Responsible (RNAME)	hostmaster@buildit.net
Refresh	28800s
Retry	7200s
Expire	604800s
Minimum (neg-cache TTL)	7200s

📋 Registration

✗ No registration data — collected automatically when SOA serial changes

📋 WHOIS

⏱️ Lookup Timing

NS

48ms

A

53ms

MX

53ms

AAAA

80ms

TXT

314ms

CAA

71ms

HTTPS

94ms

TLSA

487ms

SOA

86ms

MTA-STS

78ms

DNSSEC

124ms

SRV

151ms

Total

1194ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-06-25 23:24:49	1194ms	2 NS 1 A 1 MX	🔓 Insecure	View
2026-06-24 08:12:48	3561ms	2 NS 1 A 1 MX	❓ Unknown	View
2026-06-21 23:09:40	900ms	0 NS 0 A 0 MX	❓ Unknown	View
2026-06-21 17:30:49	925ms	0 NS 0 A 0 MX	❓ Unknown	View
2026-06-18 05:52:48	959ms	2 NS 1 A 1 MX	🔓 Insecure	View