Domain report: mytum.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

pass

dns-3.dfn.de, dns1.lrz.de, dns2.lrz.bayern, dns3.lrz.eu, ns.ze.tum.de

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: dns-3.dfn.de, dns1.lrz.de, dns2.lrz.bayern, dns3.lrz.eu, ns.ze.tum.de
NS in the zone: dns-3.dfn.de, dns1.lrz.de, dns2.lrz.bayern, dns3.lrz.eu, ns.ze.tum.de

Nameserver	Addresses	Network (AS)	Glue
dns-3.dfn.de	193.174.75.58 2001:638:d:b103::1	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	-
dns1.lrz.de	129.187.19.183 2001:4ca0:0:100:0:53:1:1	AS12816 MWN-AS - Leibniz-Rechenzentrum, DE AS12816 MWN-AS - Leibniz-Rechenzentrum, DE	129.187.19.183 2001:4ca0:0:100:0:53:1:1
dns2.lrz.bayern	141.40.9.211 2001:4ca0:0:100:0:53:1:2	AS12816 MWN-AS - Leibniz-Rechenzentrum, DE AS12816 MWN-AS - Leibniz-Rechenzentrum, DE	-
dns3.lrz.eu	78.128.211.180 2001:718:1:1f:50:56ff:feee:180	AS2852 CESNET2 - CESNET z.s.p.o., CZ AS2852 CESNET2 - CESNET z.s.p.o., CZ	-
ns.ze.tum.de	129.187.39.1 2001:4ca0:2e03::1:1	AS12816 MWN-AS - Leibniz-Rechenzentrum, DE AS12816 MWN-AS - Leibniz-Rechenzentrum, DE	-

Checks

✓ 5 nameservers #6

Delegated to dns-3.dfn.de, dns1.lrz.de, dns2.lrz.bayern, dns3.lrz.eu, ns.ze.tum.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 5 IPv4 /24s and 4 IPv6 /48s.
✓ 3 autonomous systems #11

The nameservers are spread over: AS12816 (MWN-AS - Leibniz-Rechenzentrum, DE): 6 addresses; AS2852 (CESNET2 - CESNET z.s.p.o., CZ): 2 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 2 addresses.
✓ Nameserver names under 3 TLDs #12

Nameserver names use the TLDs .bayern, .de, .eu.
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

warn

10 of 10 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
dns-3.dfn.de 193.174.75.58	NOERROR, 9 ms, authoritative	no	yes / yes	refused	0
dns-3.dfn.de 2001:638:d:b103::1	NOERROR, 10 ms, authoritative	no	yes / yes	refused	0
dns1.lrz.de 129.187.19.183	NOERROR, 12 ms, authoritative	no	yes / yes	refused	9.20.29-1~deb13u1-Debian
dns1.lrz.de 2001:4ca0:0:100:0:53:1:1	NOERROR, 12 ms, authoritative	no	yes / yes	refused	9.20.29-1~deb13u1-Debian
dns2.lrz.bayern 141.40.9.211	NOERROR, 12 ms, authoritative	no	yes / yes	refused	9.20.29-1~deb13u1-Debian
dns2.lrz.bayern 2001:4ca0:0:100:0:53:1:2	NOERROR, 12 ms, authoritative	no	yes / yes	refused	9.20.29-1~deb13u1-Debian
dns3.lrz.eu 78.128.211.180	NOERROR, 8 ms, authoritative	no	yes / yes	refused	9.18.49-1~deb12u2-Debian
dns3.lrz.eu 2001:718:1:1f:50:56ff:feee:180	NOERROR, 8 ms, authoritative	no	yes / yes	refused	9.18.49-1~deb12u2-Debian
ns.ze.tum.de 129.187.39.1	NOERROR, 12 ms, authoritative	no	yes / yes	refused	9.17.1-dev-8422b23c921176329c07e57aa26dfa32ed63cd4f-8422b23c921176329c07e57aa26dfa32ed63cd4f
ns.ze.tum.de 2001:4ca0:2e03::1:1	NOERROR, 12 ms, authoritative	no	yes / yes	refused	9.17.1-dev-8422b23c921176329c07e57aa26dfa32ed63cd4f-8422b23c921176329c07e57aa26dfa32ed63cd4f

Checks

✓ All respond #14

All 10 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: dns1.lrz.de: "9.20.29-1~deb13u1-Debian"; dns2.lrz.bayern: "9.20.29-1~deb13u1-Debian"; dns3.lrz.eu: "9.18.49-1~deb12u2-Debian"; ns.ze.tum.de: "9.17.1-dev-8422b23c921176329c07e57aa26dfa32ed63cd4f-8422b23c921176329c07e57aa26dfa32ed63cd4f". 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 2026102111 · primary ns.ze.tum.de

Found

Primary (MNAME): ns.ze.tum.de
Contact (RNAME): schmidt.ze.tum.de
Serial: 2026102111
Refresh / retry: 14400 s / 3600 s
Expire: 3600000 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
dns-3.dfn.de (193.174.75.58)	2026102111
dns-3.dfn.de (2001:638:d:b103::1)	2026102111
dns1.lrz.de (129.187.19.183)	2026102111
dns1.lrz.de (2001:4ca0:0:100:0:53:1:1)	2026102111
dns2.lrz.bayern (141.40.9.211)	2026102111
dns2.lrz.bayern (2001:4ca0:0:100:0:53:1:2)	2026102111
dns3.lrz.eu (78.128.211.180)	2026102111
dns3.lrz.eu (2001:718:1:1f:50:56ff:feee:180)	2026102111
ns.ze.tum.de (129.187.39.1)	2026102111
ns.ze.tum.de (2001:4ca0:2e03::1:1)	2026102111

Checks

✓ Serial 2026102111 everywhere #22

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

SOA refresh 4h, retry 1h, expire 1000h, negative TTL 1h.
✓ Primary is a public nameserver #24

The primary nameserver ns.ze.tum.de is one of the listed nameservers.
✓ Contact schmidt@ze.tum.de #25

The SOA RNAME schmidt.ze.tum.de means schmidt@ze.tum.de.
✓ Date-based serial #26

The serial 2026102111 follows the YYYYMMDDnn convention (2026-10-21).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 5 iterations, 8-byte salt
Signatures valid until: 27 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
50572	RSASHA512 (10)	SHA256 6F0CE123C61AF069…	NO
46339	RSASHA512 (10)	SHA256 0D46FB24057E75F8…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
46339	KSK (257)	RSASHA512 (10)
42878	ZSK (256)	RSASHA512 (10)

Checks

✓ Signed and validated #27

The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
i

Unused DS records

These DS records match no key in the zone: key tag 50572 (SHA256). That is normal during a key rollover; otherwise remove them.

#28
✓ Modern algorithms #29

Key algorithms: RSASHA512 (10).
!

Signatures expire soon

The earliest signature expires at 2026-10-27 16:28 UTC (in 137h0m0s). Check that automatic re-signing works.

#30
!

NSEC3 with extra iterations or salt

NSEC3 uses 5 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

17 records at the apex

Found

Read from: 193.174.75.58:53

Type	Value	TTL
SOA	ns.ze.tum.de. schmidt.ze.tum.de. 2026102111 14400 3600 3600000 3600	3600
NS	dns3.lrz.eu.	7200
NS	dns1.lrz.de.	7200
NS	ns.ze.tum.de.	7200
NS	dns2.lrz.bayern.	7200
NS	dns-3.dfn.de.	7200
MX	100 postrelay2.lrz.de.	7200
MX	100 postrelay1.lrz.de.	7200
TXT	"google-gws-recovery-domain-verification=75195993"	7200
TXT	"google-site-verification=lSPcUSb2DSl0xh1Utt-GJnXx9vsyJmaIe2rg10NZojA"	7200
TXT	"google-site-verification=9FK6Y2HOicngmFz7mAiClDmFOtEWI0DcktrTACRrNDY"	7200
TXT	"apple-domain-verification=LEtv5qoeG8GIAAnX"	7200
TXT	"MS=ms84169870"	7200
TXT	"v=spf1 a:mail.zv.tum.de a:mail.ze.tum.de redirect=_spf.mail.lrz.de"	7200
CAA	0 issue "sectigo.com"	7200
CAA	0 issue "pki.dfn.de"	7200
CAA	0 issue "letsencrypt.org"	7200

Checks

✓ TTLs within range #32

TTLs: MX 2h, NS 2h. The NS TTL at the parent is 1d and in the zone 2h; 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: sectigo.com, pki.dfn.de, letsencrypt.org.