Domain report: kayak.de

Registration

info

.de country-code

Found

TLD: .de (country-code)
ICANN policies apply: no

Checks

i

.de is a country-code TLD (ccTLD)

Country-code TLD: governed by its local registry under national policy, not by an ICANN contract. Registrar accreditation, dispute resolution and RDAP/WHOIS rules are set by the registry.

#1
✓ TLD delegated and signed #2

.de is delegated in the root zone and DNSSEC-signed.
i

Registration data not available

No registration data via RDAP: the registry of .de offers no RDAP service. Many ccTLD registries don't offer RDAP; check the registry's WHOIS instead.

#3

Delegation

info

blue.foundationdns.com, blue.foundationdns.net, blue.foundationdns.org

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: blue.foundationdns.com, blue.foundationdns.net, blue.foundationdns.org
NS in the zone: blue.foundationdns.com, blue.foundationdns.net, blue.foundationdns.org

Nameserver	Addresses	Network (AS)	Glue
blue.foundationdns.com	162.159.60.1 108.162.198.1 172.64.40.1 2606:4700:57::6ca2:c601 2a06:98c1:56::ac40:2801 2803:f800:52::a29f:3c01	AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US	-
blue.foundationdns.net	172.64.40.31 162.159.60.31 108.162.198.31 2606:4700:57::6ca2:c61f 2a06:98c1:56::ac40:281f 2803:f800:52::a29f:3c1f	AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US	-
blue.foundationdns.org	108.162.198.61 162.159.60.61 172.64.40.61 2a06:98c1:56::ac40:283d 2803:f800:52::a29f:3c3d 2606:4700:57::6ca2:c63d	AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US	-

Checks

✓ 3 nameservers #6

Delegated to blue.foundationdns.com, blue.foundationdns.net, blue.foundationdns.org.
✓ Parent and zone agree #7

The parent delegation and the zone's NS records list the same nameservers.
✓ No glue needed #8

All nameservers are outside the zone, so no glue records are needed.
✓ All names resolve #9

Every nameserver name has an address and is not an alias.
✓ Nameservers in different networks #10

The nameservers are spread over 3 IPv4 /24s and 3 IPv6 /48s.
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 18 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
✓ Nameserver names under 3 TLDs #12

Nameserver names use the TLDs .com, .net, .org.
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

warn

18 of 18 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
blue.foundationdns.com 162.159.60.1	NOERROR, 14 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.com 108.162.198.1	NOERROR, 10 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.com 172.64.40.1	NOERROR, 14 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.com 2606:4700:57::6ca2:c601	NOERROR, 12 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.com 2a06:98c1:56::ac40:2801	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.com 2803:f800:52::a29f:3c01	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.net 172.64.40.31	NOERROR, 14 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.net 162.159.60.31	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.net 108.162.198.31	NOERROR, 10 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.net 2606:4700:57::6ca2:c61f	NOERROR, 11 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.net 2a06:98c1:56::ac40:281f	NOERROR, 14 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.net 2803:f800:52::a29f:3c1f	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.org 108.162.198.61	NOERROR, 10 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.org 162.159.60.61	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.org 172.64.40.61	NOERROR, 14 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.org 2a06:98c1:56::ac40:283d	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.org 2803:f800:52::a29f:3c3d	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.0
blue.foundationdns.org 2606:4700:57::6ca2:c63d	NOERROR, 11 ms, authoritative	no	yes / yes	refused	2026.10.0

Checks

✓ All respond #14

All 18 nameserver addresses answered.
✓ All authoritative #15

Every responding nameserver answers authoritatively for the zone.
✓ No recursion #16

The nameservers do not answer recursive queries for other domains.
!

Software version disclosed

These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: blue.foundationdns.com: "2026.10.0"; blue.foundationdns.net: "2026.10.0"; blue.foundationdns.org: "2026.10.0". Hide or replace the version string.

#17
✓ Zone transfers refused #18

No nameserver allows a zone transfer to the public.
✓ TCP supported #19

All nameservers answer over TCP.
✓ EDNS supported #20

All nameservers support EDNS(0).
✓ Public addresses #21

All nameserver addresses are publicly routable.

SOA

pass

serial 2416695515 · primary blue.foundationdns.com

Found

Primary (MNAME): blue.foundationdns.com
Contact (RNAME): dns.cloudflare.com
Serial: 2416695515
Refresh / retry: 10000 s / 2400 s
Expire: 604800 s
Negative TTL: 1800 s

Serial per nameserver

Nameserver	Serial
blue.foundationdns.com (162.159.60.1)	2416695515
blue.foundationdns.com (108.162.198.1)	2416695515
blue.foundationdns.com (172.64.40.1)	2416695515
blue.foundationdns.com (2606:4700:57::6ca2:c601)	2416695515
blue.foundationdns.com (2a06:98c1:56::ac40:2801)	2416695515
blue.foundationdns.com (2803:f800:52::a29f:3c01)	2416695515
blue.foundationdns.net (172.64.40.31)	2416695515
blue.foundationdns.net (162.159.60.31)	2416695515
blue.foundationdns.net (108.162.198.31)	2416695515
blue.foundationdns.net (2606:4700:57::6ca2:c61f)	2416695515
blue.foundationdns.net (2a06:98c1:56::ac40:281f)	2416695515
blue.foundationdns.net (2803:f800:52::a29f:3c1f)	2416695515
blue.foundationdns.org (108.162.198.61)	2416695515
blue.foundationdns.org (162.159.60.61)	2416695515
blue.foundationdns.org (172.64.40.61)	2416695515
blue.foundationdns.org (2a06:98c1:56::ac40:283d)	2416695515
blue.foundationdns.org (2803:f800:52::a29f:3c3d)	2416695515
blue.foundationdns.org (2606:4700:57::6ca2:c63d)	2416695515

Checks

✓ Serial 2416695515 everywhere #22

All nameservers serve the same version of the zone.
✓ Timers within recommendations #23

SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
✓ Primary is a public nameserver #24

The primary nameserver blue.foundationdns.com is one of the listed nameservers.
✓ Contact dns@cloudflare.com #25

The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
✓ Timestamp serial #26

The serial 2416695515 is a Unix timestamp (2046-08-01 00:18 UTC).

DNSSEC

warn

Not signed

Found

Validated by resolver: no

Checks

!

Not signed

The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.

#27

Records

info

22 records at the apex

Found

Read from: 162.159.60.1:53

Type	Value	TTL
SOA	blue.foundationdns.com. dns.cloudflare.com. 2416695515 10000 2400 604800 1800	1800
NS	blue.foundationdns.com.	86400
NS	blue.foundationdns.net.	86400
NS	blue.foundationdns.org.	86400
A	151.101.65.29	3600
A	151.101.129.29	3600
A	151.101.193.29	3600
A	151.101.1.29	3600
AAAA	2a04:4e42:400::285	3600
AAAA	2a04:4e42:200::285	3600
AAAA	2a04:4e42::285	3600
AAAA	2a04:4e42:600::285	3600
MX	0 aspmx.l.google.com.	3600
MX	10 aspmx2.googlemail.com.	3600
MX	10 aspmx3.googlemail.com.	3600
MX	10 aspmx4.googlemail.com.	3600
MX	10 aspmx5.googlemail.com.	3600
MX	5 alt1.aspmx.l.google.com.	3600
MX	5 alt2.aspmx.l.google.com.	3600
TXT	"d62ed6b0bba9480d9b9a62aa8059b350"	3600
TXT	"globalsign-domain-verification=Wq9iztGUzQcBBi1OLrEOlXtefwOzX7yfvhbsw-CVdo"	3600
TXT	"v=spf1 include:spf.kayak.com ~all"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, AAAA 1h, MX 1h, NS 1d.
✓ No CNAME at the apex #33

The zone apex has no CNAME record.
✓ No wildcard #34

Names that don't exist return NXDOMAIN.
i

No CAA records

Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.

#35