matematikfessor.dk DNS records

🖥️ Nameservers2 records 95ms

Nameserver	IP addresses	PTR	ASN / ISP
jack.ns.cloudflare.com	108.162.193.121 172.64.33.121 173.245.59.121 2606:4700:58::adf5:3b79 2803:f800:50::6ca2:c179 2a06:98c1:50::ac40:2179	jack.ns.cloudflare.com jack.ns.cloudflare.com jack.ns.cloudflare.com jack.ns.cloudflare.com jack.ns.cloudflare.com jack.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.
rita.ns.cloudflare.com	108.162.192.140 172.64.32.140 173.245.58.140 2606:4700:50::adf5:3a8c 2803:f800:50::6ca2:c08c 2a06:98c1:50::ac40:208c	rita.ns.cloudflare.com rita.ns.cloudflare.com rita.ns.cloudflare.com rita.ns.cloudflare.com rita.ns.cloudflare.com rita.ns.cloudflare.com	AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc. AS13335 Cloudflare, Inc.

🌍 A Records2 records 83ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
104.20.43.156	300s	—	AS13335	Cloudflare, Inc.	104.20.0.0/18	—	—
172.66.168.148	300s	—	AS13335	Cloudflare, Inc.	172.66.160.0/20	—	—

📧 MX Records7 records 82ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	300s	aspmx.l.google.com	142.251.127.27 2a00:1450:4001:c21::1b	lcfrai-in-f27.1e100.net lcfrai-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
20	300s	alt1.aspmx.l.google.com	142.250.147.26 2a00:1450:4025:c01::1b	rd-in-f26.1e100.net rd-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
20	300s	alt2.aspmx.l.google.com	172.253.152.26 2a00:1450:4010:c22::1b	yulpptr-in-f26.1e100.net yulpptr-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
30	300s	aspmx2.googlemail.com	142.250.147.27 2a00:1450:4025:c01::1a	rd-in-f27.1e100.net rd-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC
30	300s	aspmx3.googlemail.com	172.253.152.26 2a00:1450:4010:c22::1b	yulpptr-in-f26.1e100.net yulpptr-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
30	300s	aspmx4.googlemail.com	192.178.211.27 2404:6800:4000:1025::1b	lcbomp-in-f27.1e100.net lcbomp-in-f27.1e100.net	AS15169 Google LLC AS15169 Google LLC
30	300s	aspmx5.googlemail.com	192.178.158.26 2404:6800:4013:813::1a	lcdels-in-f26.1e100.net lcdels-in-f26.1e100.net	AS15169 Google LLC AS15169 Google LLC

🔷 AAAA Records (IPv6)

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records1 records 98ms

Priority	Target	SvcParams
1 service	.	alpn="h2" ipv4hint=104.20.43.156,172.66.168.148

📝 TXT Records6 records 277ms

TXT Record
_bfcxrdfdx2i7moruqop6fcbsrosf43z
ahrefs-site-verification_1ad5148ad0b4b45fd747bb95c0abbb1804c6a56c42aee85ec8ec164e098d05b8
google-site-verification=DGwLEquGMDhgdAMrLYO4CBvay3h-1sUqtzMAwIKon5M
google-site-verification=jgp9kySin-Wc_1sBUTcsRJN5dDJ_p6Swv12i0f48iK4
itk9l3bo0tkunqtq8b6f6bh12i
v=spf1 include:spf.dixa.io include:_spf.google.com include:spf.mandrillapp.com ~all

✉️ SPF

Policy	Record (matematikfessor.dk)
~all (soft fail)	v=spf1 include:spf.dixa.io include:_spf.google.com include:spf.mandrillapp.com ~all

📨 DMARC

✗ No DMARC record — mail spoofing not restricted

📬 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)

🔐 DNSSEC207ms

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

🏷️ SOA0ms

Field	Value
Serial	2413334589
Primary NS (MNAME)	jack.ns.cloudflare.com
Responsible (RNAME)	dns@cloudflare.com
Refresh	10000s
Retry	2400s
Expire	604800s
Minimum (neg-cache TTL)	1800s

📋 Registration

✗ No registration data — collected automatically when SOA serial changes

📋 WHOIS

⏱️ Lookup Timing

NS

95ms

A

83ms

MX

82ms

AAAA

95ms

TXT

277ms

CAA

96ms

HTTPS

98ms

TLSA

199ms

SOA

0ms

MTA-STS

124ms

DNSSEC

207ms

SRV

137ms

Total

1609ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-08-29 08:42:23	1609ms	2 NS 2 A 7 MX	🔓 Insecure	View
2026-08-26 13:19:00	1176ms	2 NS 2 A 7 MX	🔓 Insecure	View
2026-07-08 20:52:38	1908ms	2 NS 2 A 7 MX	🔓 Insecure	View
2026-06-24 17:25:18	1141ms	2 NS 2 A 7 MX	🔓 Insecure	View
2026-06-23 21:56:21	1170ms	0 NS 0 A 0 MX	❓ Unknown	View
2026-06-18 02:17:05	961ms	2 NS 2 A 7 MX	🔓 Insecure	View