Domain report: uni-augsburg.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

dns-3.dfn.de, dns1.rz.uni-augsburg.de, dns2.rz.uni-augsburg.de

Found

Parent zone: de
Delegation from: a.nic.de (194.0.0.53)
NS at the parent: dns-3.dfn.de, dns1.rz.uni-augsburg.de, dns2.rz.uni-augsburg.de
NS in the zone: dns-3.dfn.de, dns1.rz.uni-augsburg.de, dns2.rz.uni-augsburg.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.rz.uni-augsburg.de	137.250.2.254	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	137.250.2.254
dns2.rz.uni-augsburg.de	137.250.2.253	AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE	137.250.2.253

Checks

✓ 3 nameservers #6

Delegated to dns-3.dfn.de, dns1.rz.uni-augsburg.de, dns2.rz.uni-augsburg.de.
✓ Parent and zone agree #7

The parent delegation and the zone's NS records list the same nameservers.
✓ Glue present and correct #8

Glue is published for the nameservers inside the zone: dns1.rz.uni-augsburg.de, dns2.rz.uni-augsburg.de.
✓ 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 2 IPv4 /24s and 1 IPv6 /48.
i

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): 4 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
i

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
i

Partly IPv6

These nameservers have no IPv6 address: dns1.rz.uni-augsburg.de, dns2.rz.uni-augsburg.de.

#13

Nameservers

info

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
dns-3.dfn.de 193.174.75.58	NOERROR, 10 ms, authoritative	no	yes / yes	refused	0
dns-3.dfn.de 2001:638:d:b103::1	NOERROR, 8 ms, authoritative	no	yes / yes	refused	0
dns1.rz.uni-augsburg.de 137.250.2.254	NOERROR, 12 ms, authoritative	no	yes / yes	refused	unknown
dns2.rz.uni-augsburg.de 137.250.2.253	NOERROR, 13 ms, authoritative	no	yes / yes	refused	unknown

Checks

✓ All respond #14

All 4 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.
i

Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: dns-3.dfn.de: "0"; dns1.rz.uni-augsburg.de: "unknown"; dns2.rz.uni-augsburg.de: "unknown".

#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

warn

serial 2261021893 · primary dns1.rz.uni-augsburg.de

Found

Primary (MNAME): dns1.rz.uni-augsburg.de
Contact (RNAME): hostmaster.uni-augsburg.de
Serial: 2261021893
Refresh / retry: 14400 s / 1800 s
Expire: 1209600 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
dns-3.dfn.de (193.174.75.58)	2261021893
dns-3.dfn.de (2001:638:d:b103::1)	2261021893
dns1.rz.uni-augsburg.de (137.250.2.254)	2261021962
dns2.rz.uni-augsburg.de (137.250.2.253)	2261021962

Checks

!

Serials differ

The nameservers serve different versions of the zone: 2261021893 on dns-3.dfn.de (193.174.75.58), dns-3.dfn.de (2001:638:d:b103::1); 2261021962 on dns1.rz.uni-augsburg.de (137.250.2.254), dns2.rz.uni-augsburg.de (137.250.2.253). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.

#22
✓ Timers within recommendations #23

SOA refresh 4h, retry 30m, expire 14d, negative TTL 1h.
✓ Primary is a public nameserver #24

The primary nameserver dns1.rz.uni-augsburg.de is one of the listed nameservers.
✓ Contact hostmaster@uni-augsburg.de #25

The SOA RNAME hostmaster.uni-augsburg.de means hostmaster@uni-augsburg.de.
✓ Timestamp serial #26

The serial 2261021893 is a Unix timestamp (2041-08-25 05:38 UTC).

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: 8 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
34201	RSASHA256 (8)	SHA256 D20810B2E6F5A4AA…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
27589	ZSK (256)	RSASHA256 (8)
36037	KSK (257)	RSASHA256 (8)
34201	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 34201 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-11-08 #30

The earliest DNSKEY/SOA signature expires at 2026-11-08 22:11 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

info

15 records at the apex

Found

Read from: 193.174.75.58:53

Type	Value	TTL
SOA	dns1.rz.uni-augsburg.de. hostmaster.uni-augsburg.de. 2261021893 14400 1800 1209600 3600	86400
NS	dns-3.dfn.de.	172800
NS	dns1.rz.uni-augsburg.de.	172800
NS	dns2.rz.uni-augsburg.de.	172800
A	137.250.6.130	86400
MX	10 b2541.mx.srv.dfn.de.	86400
MX	10 c2541.mx.srv.dfn.de.	86400
MX	10 a2541.mx.srv.dfn.de.	86400
TXT	"have-i-been-pwned-verification=d4ed42f5493c3bf14a66d7c75e63b5d4"	86400
TXT	"MS=ms14255073"	86400
TXT	"ZOOM_verify_ieinpA1qTSKwVGpIX3K_rQ"	86400
TXT	"adobe-idp-site-verification=8e2666bc7db69eb04ca2e4d74b113ff6c138eb36e381d38a99fa1c57f627153d"	86400
TXT	"v=spf1 ip4:137.250.2.0/24" " ip4:54.229.2.165 ip4:52.30.130.201 ip4:52.17.45.98 ip4:52.16.190.81" " ip4:193.174.97.18/32 ip6:2001:4ca0:10b:6::c1ae:6112" " ip4:195.200.70.64/26 ip4:193.34.207.156/31 ip4:193.34.207.154/31 ip4:46.29.101.1/32 ip4:46.29.101.2/32 ip4:217.150.155.10/32 ip4:217.150.155.12/32" " ip4:77.237.55.128/27 ip4:91.114.45.124/32 ip4:37.228.153.6/32" " ip4:194.95.233.14/32 ip6:2001:638:d:c301:acdc:1979:2:c6/128" " ip4:194.95.235.14/32 ip6:2001:638:d:c302:acdc:1979:2:c6/128" " ip4:194.95.239.14/32 ip6:2001:638:d:c303:acdc:1979:2:c6/128" " ip4:194.95.233.24/32 ip6:2001:638:d:c301:acdc:1979:2:d0/128" " ip4:194.95.235.24/32 ip6:2001:638:d:c302:acdc:1979:2:d0/128" " ip4:194.95.239.24/32 ip6:2001:638:d:c303:acdc:1979:2:d0/128" " ip4:46.253.251.142/32 ip4:116.203.110.13/32 ip4:159.69.3.23/32" " ~all"	86400
TXT	"apple-domain-verification=dTOJE1keRwn8rv6G"	86400
TXT	"google-site-verification=GTjicHEw_0nKKyLboAwU95RKVPqM5HnLUZ1_a9gmUmM"	86400

Checks

✓ TTLs within range #32

TTLs: A 1d, MX 1d, NS 2d. The NS TTL at the parent is 1d and in the zone 2d; 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