Domain report: ksk-koeln.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

warn

ns1.s-fg-net.de, ns2.s-fg-net.com, ns3.s-fg-net.eu, ns4.s-fg-net.de

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: ns1.s-fg-net.de, ns2.s-fg-net.com, ns3.s-fg-net.eu, ns4.s-fg-net.de
NS in the zone: ns1.s-fg-net.de, ns2.s-fg-net.com, ns3.s-fg-net.eu, ns4.s-fg-net.de, ns5.s-fg-net.com

Nameserver	Addresses	Network (AS)	Glue
ns1.s-fg-net.de	62.181.159.76	AS15790 FINANZINFORMATIK-AS-OST - Finanz Informatik GmbH & Co. KG, DE	62.181.159.76
ns2.s-fg-net.com	195.140.118.140	AS9099 FinanzInformatik-AS-Nord - Finanz Informatik GmbH & Co. KG, DE	-
ns3.s-fg-net.eu	62.181.159.86	AS15790 FINANZINFORMATIK-AS-OST - Finanz Informatik GmbH & Co. KG, DE	-
ns4.s-fg-net.de	195.140.118.150	AS9099 FinanzInformatik-AS-Nord - Finanz Informatik GmbH & Co. KG, DE	195.140.118.150
ns5.s-fg-net.com (zone only)	85.236.58.252	AS15456 INTERNETX-AS - InterNetX GmbH, DE	-

Checks

✓ 4 nameservers #6

Delegated to ns1.s-fg-net.de, ns2.s-fg-net.com, ns3.s-fg-net.eu, ns4.s-fg-net.de.
!

NS sets differ

The nameservers at the parent and in the zone should be the same. Only in the zone: ns5.s-fg-net.com. ns1.s-fg-net.de, ns2.s-fg-net.com, ns3.s-fg-net.eu, ns4.s-fg-net.de, ns5.s-fg-net.com report NS ns1.s-fg-net.de ns2.s-fg-net.com ns3.s-fg-net.eu ns4.s-fg-net.de ns5.s-fg-net.com.

#7
✓ 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 0 IPv6 /48s.
✓ 3 autonomous systems #11

The nameservers are spread over: AS15456 (INTERNETX-AS - InterNetX GmbH, DE): 1 address; AS15790 (FINANZINFORMATIK-AS-OST - Finanz Informatik GmbH & Co. KG, DE): 2 addresses; AS9099 (FinanzInformatik-AS-Nord - Finanz Informatik GmbH & Co. KG, DE): 2 addresses.
✓ Nameserver names under 3 TLDs #12

Nameserver names use the TLDs .com, .de, .eu.
!

No IPv6

None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

#13

Nameservers

pass

5 of 5 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.s-fg-net.de 62.181.159.76	NOERROR, 21 ms, authoritative	no	yes / yes	refused	-
ns2.s-fg-net.com 195.140.118.140	NOERROR, 11 ms, authoritative	no	yes / yes	refused	-
ns3.s-fg-net.eu 62.181.159.86	NOERROR, 21 ms, authoritative	no	yes / yes	refused	-
ns4.s-fg-net.de 195.140.118.150	NOERROR, 12 ms, authoritative	no	yes / yes	refused	-
ns5.s-fg-net.com 85.236.58.252	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-

Checks

✓ All respond #14

All 5 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.
✓ No version disclosed #17

The nameservers don't reveal their software version.
✓ 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 15200 · primary ns1.s-fg-net.de

Found

Primary (MNAME): ns1.s-fg-net.de
Contact (RNAME): domreg.f-i.de
Serial: 15200
Refresh / retry: 10800 s / 1080 s
Expire: 2419200 s
Negative TTL: 1800 s

Serial per nameserver

Nameserver	Serial
ns1.s-fg-net.de (62.181.159.76)	15200
ns2.s-fg-net.com (195.140.118.140)	15200
ns3.s-fg-net.eu (62.181.159.86)	15200
ns4.s-fg-net.de (195.140.118.150)	15200
ns5.s-fg-net.com (85.236.58.252)	15200

Checks

✓ Serial 15200 everywhere #22

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

SOA refresh 3h, retry 18m, expire 28d, negative TTL 30m.
✓ Primary is a public nameserver #24

The primary nameserver ns1.s-fg-net.de is one of the listed nameservers.
✓ Contact domreg@f-i.de #25

The SOA RNAME domreg.f-i.de means domreg@f-i.de.
✓ Counter serial #26

The serial 15200 is a plain counter.

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 8-byte salt
Signatures valid until: 25 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
25060	RSASHA256 (8)	SHA256 B07532C23D641743…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
25060	KSK (257)	RSASHA256 (8)
31801	ZSK (256)	RSASHA256 (8)
44643	ZSK (256)	RSASHA256 (8)
36603	ZSK (256)	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 25060 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 97h0m0s and created on demand; the current one was made at 2026-10-21 18:44 UTC and expires at 2026-10-25 19:30 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 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

pass

24 records at the apex

Found

Read from: 62.181.159.76:53

Type	Value	TTL
SOA	ns1.s-fg-net.de. domreg.f-i.de. 15200 10800 1080 2419200 1800	1800
NS	ns1.s-fg-net.de.	1800
NS	ns5.s-fg-net.com.	1800
NS	ns4.s-fg-net.de.	1800
NS	ns3.s-fg-net.eu.	1800
NS	ns2.s-fg-net.com.	1800
A	62.181.153.53	1800
MX	10 kkb01.mail.s-web.de.	1800
MX	10 kkb02.mail.s-web.de.	1800
TXT	"QuoVadis=c776123b-5409-4f49-8c61-0400eff9b8df"	1800
TXT	"QuoVadis=a480c0cc-9872-41ed-b115-84f14973f69e"	1800
TXT	"cisco-ci-domain-verification=65346a7b47d32d7b249bcb9d6424f95bd104c53dc977799e24dbebe4ae3f7499"	1800
TXT	"adobe-idp-site-verification=7f90187d9a09b9d6131b318725bf0dc3d27b0737767d213ac206546508bd56a8"	1800
TXT	"apple-domain-verification=Db37k7MKNZ26e6Rx"	1800
TXT	"cisco-ci-domain-verification=7d1d42303c34ba6899af082ac0ba8dce455f37ad998b6bd0ab51fb7d3c8efb05"	1800
TXT	"_rajqfirfoi3li3fa16rhws8lej9xckm"	1800
TXT	"_yy8qnfqt4h538efnypha1s58oc4sp8a"	1800
TXT	"_6vzk23t67bdkfwlzmivfb71rjisonq2"	1800
TXT	"_lxt2k5d9yth42a5mo59j680deufmnsg"	1800
TXT	"_9qgf2ox7bolusi0nl295oebwzrkn3ly"	1800
TXT	"v=spf1 include:spf.mail.s-web.de include:spf.emma.sparkasse.de include:_spf.ksk.on.services -all"	1800
CAA	0 issue "letsencrypt.org"	1800
CAA	0 issue "digicert.com"	1800
CAA	0 issue "quovadisglobal.com"	1800

Checks

✓ TTLs within range #32

TTLs: A 30m, MX 30m, NS 30m. The NS TTL at the parent is 1d and in the zone 30m; 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.
✓ CAA restricts issuance #35

Certificates may be issued by: letsencrypt.org, digicert.com, quovadisglobal.com.