fe-ctf.dk DNS records

🖥️ Nameservers4 records 40ms

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 Records1 records 53ms

IP	TTL	PTR	ASN	ISP / Org	CIDR	Country	City
34.34.144.240	600s	240.144.34.34.bc.googleusercontent.com	AS396982	Google LLC	34.32.0.0/11	🇧🇪 Belgium	Brussels

📧 MX Records2 records 45ms

Priority	TTL	Mail Server	IP addresses	PTR	ASN
10	3600s	mail.protonmail.ch	176.119.200.128 185.205.70.128 185.70.42.128	mail.protonmail.ch mail.protonmail.ch mail.protonmail.ch	AS62371 Proton AG AS62371 Proton AG AS62371 Proton AG
20	3600s	mailsec.protonmail.ch	176.119.200.129 185.205.70.129 185.70.42.129	mailsec.protonmail.ch mailsec.protonmail.ch mailsec.protonmail.ch	AS62371 Proton AG AS62371 Proton AG AS62371 Proton AG

🔷 AAAA Records (IPv6)

✗ No AAAA records — IPv6 not configured

🔐 HTTPS Records

✗ No HTTPS RR — no SVCB/HTTPS service binding

📝 TXT Records3 records 137ms

TXT Record
google-site-verification=CIBMdQmBhXhCLo1DRWAfpjVtNJ6DiC63nx7ld5NRZYI
protonmail-verification=d9ab79ccfaf7f1a58a826c2f8abb031527311f9b
v=spf1 include:_spf.protonmail.ch mx ~all

✉️ SPF

Policy	Record (fe-ctf.dk)
~all (soft fail)	v=spf1 include:_spf.protonmail.ch mx ~all

📨 DMARC

Policy	Record (_dmarc.fe-ctf.dk)
p=none (monitor only)	v=DMARC1; p=none

📬 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 / DANE4 records 124ms

Service / Owner	Type	Cert association
SMTP _25._tcp.mail.protonmail.ch	DANE-EE · SPKI · SHA-256	6111A5698D23C89E09C36FF833C1487E…
SMTP _25._tcp.mail.protonmail.ch	DANE-EE · SPKI · SHA-256	76BB66711DA416433CA890A5B2E5A053…
SMTP _25._tcp.mailsec.protonmail.ch	DANE-EE · SPKI · SHA-256	76BB66711DA416433CA890A5B2E5A053…
SMTP _25._tcp.mailsec.protonmail.ch	DANE-EE · SPKI · SHA-256	6111A5698D23C89E09C36FF833C1487E…

🔐 DNSSEC2062ms

Check	Result
Validation Status	🔒 Secure
AD Flag (resolver validates)	✓ Set
DS Record	✓ Found
DNSKEY Record	✓ Found
Flags	fully validated

🏷️ SOA0ms

Field	Value
Serial	2023102408
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

40ms

A

53ms

MX

45ms

AAAA

25ms

TXT

137ms

CAA

49ms

HTTPS

45ms

TLSA

124ms

SOA

0ms

MTA-STS

59ms

DNSSEC

2062ms

SRV

66ms

Total

2585ms

🕐 Scan History

Scanned At	Duration	Records	DNSSEC
2026-08-27 07:29:15	2585ms	4 NS 1 A 2 MX	🔒 Secure	View
2026-06-25 02:43:00	896ms	4 NS 1 A 2 MX	🔒 Secure	View
2026-06-23 03:40:16	982ms	0 NS 0 A 0 MX	❓ Unknown	View
2026-06-21 05:47:57	1228ms	4 NS 1 A 2 MX	🔒 Secure	View
2026-06-21 05:14:44	1170ms	0 NS 0 A 0 MX	❓ Unknown	View
2026-06-19 18:53:53	2710ms	4 NS 1 A 2 MX	🔒 Secure	View
2026-06-17 09:24:35	3043ms	4 NS 1 A 2 MX	🔒 Secure	View