Domain report: fitbook.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

a1-130.akam.net, a11-67.akam.net, a14-64.akam.net, a16-65.akam.net, a6-66.akam.net, a7-67.akam.net, ns21.netuse.de

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: a1-130.akam.net, a11-67.akam.net, a14-64.akam.net, a16-65.akam.net, a6-66.akam.net, a7-67.akam.net, ns21.netuse.de
NS in the zone: a1-130.akam.net, a11-67.akam.net, a14-64.akam.net, a16-65.akam.net, a6-66.akam.net, a7-67.akam.net, ns21.netuse.de

Nameserver	Addresses	Network (AS)	Glue
a1-130.akam.net	193.108.91.130 2600:1401:2::82	AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL	-
a11-67.akam.net	84.53.139.67 2600:1480:1::43	AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL	-
a14-64.akam.net	184.26.161.64 2600:1480:1800::40	AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL	-
a16-65.akam.net	23.211.132.65 2600:1406:1b::41	AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL	-
a6-66.akam.net	23.211.133.66 2600:1401:1::42	AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL	-
a7-67.akam.net	23.61.199.67 2600:1406:32::43	AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL	-
ns21.netuse.de	52.137.9.10	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US	52.137.9.10

Checks

✓ 7 nameservers #6

Delegated to a1-130.akam.net, a11-67.akam.net, a14-64.akam.net, a16-65.akam.net, a6-66.akam.net, a7-67.akam.net, ns21.netuse.de.
✓ 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 7 IPv4 /24s and 6 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 12 addresses; AS8075 (MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US): 1 address.
✓ Nameserver names under 2 TLDs #12

Nameserver names use the TLDs .de, .net.
i

Partly IPv6

These nameservers have no IPv6 address: ns21.netuse.de.

#13

Nameservers

warn

13 of 13 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
a1-130.akam.net 193.108.91.130	NOERROR, 3 ms, authoritative	no	yes / yes	refused	41824.7
a1-130.akam.net 2600:1401:2::82	NOERROR, 4 ms, authoritative	no	yes / yes	refused	41824.7
a11-67.akam.net 84.53.139.67	NOERROR, 3 ms, authoritative	no	yes / yes	refused	41824.5
a11-67.akam.net 2600:1480:1::43	NOERROR, 4 ms, authoritative	no	yes / yes	refused	41824.9
a14-64.akam.net 184.26.161.64	NOERROR, 3 ms, authoritative	no	yes / yes	refused	48878.29
a14-64.akam.net 2600:1480:1800::40	NOERROR, 4 ms, authoritative	no	yes / yes	refused	48878.26
a16-65.akam.net 23.211.132.65	NOERROR, 4 ms, authoritative	no	yes / yes	refused	48878.27
a16-65.akam.net 2600:1406:1b::41	NOERROR, 4 ms, authoritative	no	yes / yes	refused	48878.26
a6-66.akam.net 23.211.133.66	NOERROR, 3 ms, authoritative	no	yes / yes	refused	48878.29
a6-66.akam.net 2600:1401:1::42	NOERROR, 4 ms, authoritative	no	yes / yes	refused	48878.32
a7-67.akam.net 23.61.199.67	NOERROR, 4 ms, authoritative	no	yes / yes	refused	41824.8
a7-67.akam.net 2600:1406:32::43	NOERROR, 5 ms, authoritative	no	yes / yes	refused	41824.10
ns21.netuse.de 52.137.9.10	NOERROR, 11 ms, authoritative	no	yes / yes	refused	-

Checks

✓ All respond #14

All 13 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: a1-130.akam.net: "41824.7"; a11-67.akam.net: "41824.5"; a11-67.akam.net: "41824.9"; a14-64.akam.net: "48878.29"; a14-64.akam.net: "48878.26"; a16-65.akam.net: "48878.27"; a16-65.akam.net: "48878.26"; a6-66.akam.net: "48878.29"; a6-66.akam.net: "48878.32"; a7-67.akam.net: "41824.8"; a7-67.akam.net: "41824.10". 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 2026102110 · primary ns21.netuse.de

Found

Primary (MNAME): ns21.netuse.de
Contact (RNAME): hostmaster.netuse.de
Serial: 2026102110
Refresh / retry: 3600 s / 1200 s
Expire: 3600000 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
a1-130.akam.net (193.108.91.130)	2026102110
a1-130.akam.net (2600:1401:2::82)	2026102110
a11-67.akam.net (84.53.139.67)	2026102110
a11-67.akam.net (2600:1480:1::43)	2026102110
a14-64.akam.net (184.26.161.64)	2026102110
a14-64.akam.net (2600:1480:1800::40)	2026102110
a16-65.akam.net (23.211.132.65)	2026102110
a16-65.akam.net (2600:1406:1b::41)	2026102110
a6-66.akam.net (23.211.133.66)	2026102110
a6-66.akam.net (2600:1401:1::42)	2026102110
a7-67.akam.net (23.61.199.67)	2026102110
a7-67.akam.net (2600:1406:32::43)	2026102110
ns21.netuse.de (52.137.9.10)	2026102110

Checks

✓ Serial 2026102110 everywhere #22

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

SOA refresh 1h, retry 20m, expire 1000h, negative TTL 1h.
✓ Primary is a public nameserver #24

The primary nameserver ns21.netuse.de is one of the listed nameservers.
✓ Contact hostmaster@netuse.de #25

The SOA RNAME hostmaster.netuse.de means hostmaster@netuse.de.
✓ Date-based serial #26

The serial 2026102110 follows the YYYYMMDDnn convention (2026-10-21).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 15 iterations, 8-byte salt
Signatures valid until: 27 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
64276	RSASHA256 (8)	SHA256 4AC16C89C4D4A3C2…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
6471	ZSK (256)	RSASHA256 (8)
64276	KSK (257)	RSASHA256 (8)

Checks

✓ Signed and validated #27

The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
✓ DS matches a key #28

The DS record at the parent matches a key in the zone: key tag 64276 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
!

Signatures expire soon

The earliest signature expires at 2026-10-27 18:27 UTC (in 140h0m0s). Check that automatic re-signing works.

#30
!

NSEC3 with extra iterations or salt

NSEC3 uses 15 iterations and a 8-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.

#31

Records

info

15 records at the apex

Found

Read from: 193.108.91.130:53

Type	Value	TTL
SOA	ns21.netuse.de. hostmaster.netuse.de. 2026102110 3600 1200 3600000 3600	3600
NS	a7-67.akam.net.	3600
NS	a16-65.akam.net.	3600
NS	a11-67.akam.net.	3600
NS	ns21.netuse.de.	3600
NS	a1-130.akam.net.	3600
NS	a14-64.akam.net.	3600
NS	a6-66.akam.net.	3600
A	76.223.57.215	1800
A	13.248.163.210	1800
MX	0 fitbook-de.mail.protection.outlook.com.	86400
TXT	"v=spf1 include:spf.asv.de include:spf.protection.outlook.com ?all"	600
TXT	"google-site-verification=_O7yBkhSaulBcgNr1FeXq-lNaBg0eh6LI7yMFjk_XsY"	600
TXT	"tollbit-domain-verification=931e970b3a1bc1545b3da6fbeec8c5d43d3e659f7003166db11eef4d83e7d006"	600
TXT	"MS=ms90228400"	600

Checks

✓ TTLs within range #32

TTLs: A 30m, MX 1d, NS 1h. The NS TTL at the parent is 1d and in the zone 1h; resolvers may use either.
✓ 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