Domain report: folkwang-uni.de

Registration

info

.de country-code

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.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.
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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

warn

dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.de

Nameserver	Addresses	Network (AS)	Glue
dns-1.dfn.de	193.174.75.50 2001:638:d:b101::1	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	-
dns-2.dfn.de	193.174.75.54 2001:638:d:b102::1	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	-
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	-

✓ 3 nameservers #6

Delegated to dns-1.dfn.de, dns-2.dfn.de, dns-3.dfn.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 one network

all IPv4 addresses are in 193.174.75.0/24; all IPv6 addresses are in 2001:638:d::/48. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).

#10
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All nameservers in one AS

All nameserver addresses are announced by one network operator (AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 6 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
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All nameserver names under .de

All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.

#12
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

info

6 of 6 addresses answer authoritatively

Nameserver	Answer	Recursion	TCP / EDNS	AXFR
dns-1.dfn.de 193.174.75.50	NOERROR, 13 ms, authoritative	no	yes / yes	refused
dns-1.dfn.de 2001:638:d:b101::1	NOERROR, 15 ms, authoritative	no	yes / yes	refused
dns-2.dfn.de 193.174.75.54	NOERROR, 7 ms, authoritative	no	yes / yes	refused
dns-2.dfn.de 2001:638:d:b102::1	NOERROR, 10 ms, authoritative	no	yes / yes	refused
dns-3.dfn.de 193.174.75.58	NOERROR, 11 ms, authoritative	no	yes / yes	refused
dns-3.dfn.de 2001:638:d:b103::1	NOERROR, 9 ms, authoritative	no	yes / yes	refused

✓ All respond #14

All 6 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.
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Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: dns-1.dfn.de: "0"; dns-2.dfn.de: "0"; dns-3.dfn.de: "0".

#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.

info

serial 498 · primary ns.folkwang-uni.de

✓ Serial 498 everywhere #22

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

SOA refresh 1h, retry 15m, expire 28d, negative TTL 1h.
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Hidden master

The primary nameserver ns.folkwang-uni.de is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.

#24
✓ Contact hostmaster@folkwang-uni.de #25

The SOA RNAME hostmaster.folkwang-uni.de means hostmaster@folkwang-uni.de.
✓ Counter serial #26

The serial 498 is a plain counter.

warn

Not signed

pass

18 records at the apex

Type	Value	TTL
SOA	ns.folkwang-uni.de. hostmaster.folkwang-uni.de. 498 3600 900 2419200 3600	28800
NS	dns-3.dfn.de.	28800
NS	dns-2.dfn.de.	28800
NS	dns-1.dfn.de.	28800
A	185.237.67.203	28800
MX	10 mx.folkwang-uni.de.	28800
TXT	"v=spf1 ip4:193.175.156.121 ip4:147.135.249.48/28 ip4:51.89.73.208/28 ip4:54.37.79.226 ip4:193.174.118.82 ip4:193.174.118.83 include:spfa.myconvento.com include:spf-eu.exlibrisgroup.com include:spf.smtp.net -all"	28800
TXT	"adobe-idp-site-verification=b24e2a9aebe1223cc84892abc289014b64be71b5e6a9ec9d8f8342096070b5d0"	28800
TXT	"MS=F6041A594455A310BD06119B212BDEF0AD8CC62E"	28800
TXT	"spycloud-domain-verification=d06c7455-64ca-44fc-b3cd-c3eda79e5206"	28800
TXT	"apple-domain-verification=aE26gtjoz6h8BTSj"	28800
TXT	"google-site-verification=27_r5kWtMtWI_2Yg3_Hi0HaikBxitta65n_Ybef4LT4"	28800
TXT	"ZOOM_verify_7ypyL1QIQdy7zuQstw37fw"	28800
CAA	0 issue "telesec.de"	28800
CAA	0 issue "harica.gr"	28800
CAA	0 issue "pki.dfn.de"	28800
CAA	0 issue "letsencrypt.org"	28800
CAA	0 issue "sectigo.com"	28800

✓ TTLs within range #32

TTLs: A 8h, MX 8h, NS 8h. The NS TTL at the parent is 1d and in the zone 8h; 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: telesec.de, harica.gr, pki.dfn.de, letsencrypt.org, sectigo.com.