letterday.dk
Last scanned: 2026-08-26 04:25:40  ·  1090ms total
⬇ Zone File 📜 Record History ⚡ Scan Now
🖥️ Nameservers2 records   44ms
NameserverIP addressesPTRASN / ISP
ns01.one.com 195.206.121.10
2001:67c:28cc::10		 ns01.one.com
ns01.one.com		 AS197495 One.com A/S
AS197495 One.com A/S
ns02.one.com 185.10.11.10
2001:67c:3c0::10		 ns02.one.com
ns02.one.com		 AS51468 One.com A/S
AS51468 One.com A/S
🌍 A Records1 records   48ms
IPTTLPTRASNISP / OrgCIDRCountryCity
77.213.66.202 600s — AS9158 Telenor A/S 77.212.0.0/14 🇩🇰 Denmark —
📧 MX Records2 records   45ms
PriorityTTLMail ServerIP addressesPTRASN
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 Records2 records   280ms
TXT Record
protonmail-verification=8df4e6edbd202746b199a1818d1ba616ef2b2d12
v=spf1 include:_spf.protonmail.ch ~all
✉️ SPF
PolicyRecord (letterday.dk)
~all (soft fail) v=spf1 include:_spf.protonmail.ch ~all
📨 DMARC
PolicyRecord (_dmarc.letterday.dk)
p=quarantine v=DMARC1; p=quarantine
📬 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   345ms
Service / OwnerTypeCert association
SMTP _25._tcp.mail.protonmail.ch DANE-EE · SPKI · SHA-256 76BB66711DA416433CA890A5B2E5A053…
SMTP _25._tcp.mail.protonmail.ch DANE-EE · SPKI · SHA-256 6111A5698D23C89E09C36FF833C1487E…
SMTP _25._tcp.mailsec.protonmail.ch DANE-EE · SPKI · SHA-256 6111A5698D23C89E09C36FF833C1487E…
SMTP _25._tcp.mailsec.protonmail.ch DANE-EE · SPKI · SHA-256 76BB66711DA416433CA890A5B2E5A053…
🔐 DNSSEC89ms
CheckResult
Validation Status🔒 Secure
AD Flag (resolver validates)✓ Set
DS Record✓ Found
DNSKEY Record✓ Found
Flagsfully validated
🏷️ SOA0ms
FieldValue
Serial2026081701
Primary NS (MNAME)ns01.one.com
Responsible (RNAME)hostmaster@one.com
Refresh14400s
Retry3600s
Expire1209600s
Minimum (neg-cache TTL)600s
📋 Registration
✗ No registration data — collected automatically when SOA serial changes
📋 WHOIS
⏱️ Lookup Timing
NS
44ms
A
48ms
MX
45ms
AAAA
35ms
TXT
280ms
CAA
44ms
HTTPS
71ms
TLSA
345ms
SOA
0ms
MTA-STS
69ms
DNSSEC
89ms
SRV
69ms
Total
1090ms
🕐 Scan History
Scanned AtDurationRecordsDNSSEC
2026-08-26 04:25:40 1090ms 2 NS 1 A 2 MX 🔒 Secure View
2026-08-19 01:55:09 1383ms 2 NS 1 A 2 MX 🔒 Secure View
2026-07-17 21:33:27 1222ms 2 NS 1 A 2 MX 🔒 Secure View
2026-06-28 16:41:44 722ms 2 NS 1 A 2 MX 🔒 Secure View
2026-06-17 14:41:45 1448ms 2 NS 1 A 2 MX 🔒 Secure View
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