`mail.flexibook.de`

DNSSEC	⚠️ Not signed
A	188.64.56.18^{🇩🇪 Optitrust188.64.56.0/21 optitrust}
		PTR	`mailserver.flexi-book.net`

`flexibook.de`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::6815:49d1^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3032::ac43:c029^{🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.73.209^{Cloudflare104.21.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.192.41^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`harmony.ns.cloudflare.com` ⭐
NS	`keaton.ns.cloudflare.com`
MX	`mail.flexibook.de` ⭐
TXT	`v=spf1 a mx -all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.73.209, 172.67.192.41
		IPv6 hints	2606:4700:3030::6815:49d1, 2606:4700:3032::ac43:c029
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=80, name=cloudflare-ech.com
SOA	`harmony.ns.cloudflare.com`dns@cloudflare.com serial=2398092980

MX for

flexibook.de

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DNS History

2 records (1 active, 1 former)

●A188.64.56.182026-02-22 → 2026-04-14 · 3 obs

○ 2016-07-11 15:15:58
● 2026-02-22 15:03:28
● 2026-04-14 17:00:42

○A188.64.56.952015-08-09 → 2016-07-11 · 4 obs

● 2015-08-09 05:48:50
● 2016-07-11 15:15:58
○ 2026-02-22 15:03:28
○ 2026-04-14 17:00:42

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
de	a.nic.de, f.nic.de, z.nic.de	-
flexibook.de	harmony.ns.cloudflare.com, keaton.ns.cloudflare.com	-

✅ Authoritative Response

Server:162.159.44.181

NS records: harmony.ns.cloudflare.com, keaton.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for flexibook.de (unsigned zone)

⏱️ Timing

Total: 550ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`188.64.56.18`

Analysis

Mail Server Role

mail.flexibook.de serves as the mail server for flexibook.de.

IP Addresses

mail.flexibook.de points to a single IP: 188.64.56.18.

Other host names, for instance mail.menelais.gr, securemail.secureshop.gr, mail.adriannavillas.com, mail.miloscars.gr and mail.minoshotel.gr share IP numbers with mail.flexibook.de.

mail.flexibook.de - robtex.com