studierendenwerke.de

Checked 22 October 2026, 00:31 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 0 failed 6 info

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

arch.ns.cloudflare.com, connie.ns.cloudflare.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
arch.ns.cloudflare.com, connie.ns.cloudflare.com
NS in the zone
arch.ns.cloudflare.com, connie.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
arch.ns.cloudflare.com173.245.59.68 108.162.193.68 172.64.33.68 2803:f800:50::6ca2:c144 2a06:98c1:50::ac40:2144 2606:4700:58::adf5:3b44AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US-
connie.ns.cloudflare.com172.64.32.247 108.162.192.247 173.245.58.247 2606:4700:50::adf5:3af7 2a06:98c1:50::ac40:20f7 2803:f800:50::6ca2:c0f7AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: arch.ns.cloudflare.com, connie.ns.cloudflare.com.
    #6
  • ✓ 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 6 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 12 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 .com
    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.

Nameservers

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
arch.ns.cloudflare.com 173.245.59.68NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
arch.ns.cloudflare.com 108.162.193.68NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
arch.ns.cloudflare.com 172.64.33.68NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
arch.ns.cloudflare.com 2803:f800:50::6ca2:c144NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
arch.ns.cloudflare.com 2a06:98c1:50::ac40:2144NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
arch.ns.cloudflare.com 2606:4700:58::adf5:3b44NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
connie.ns.cloudflare.com 172.64.32.247NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
connie.ns.cloudflare.com 108.162.192.247NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
connie.ns.cloudflare.com 173.245.58.247NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
connie.ns.cloudflare.com 2606:4700:50::adf5:3af7NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
connie.ns.cloudflare.com 2a06:98c1:50::ac40:20f7NOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
connie.ns.cloudflare.com 2803:f800:50::6ca2:c0f7NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2

Checks

  • ✓ All respond #14
    All 12 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: arch.ns.cloudflare.com: "2026.10.2"; connie.ns.cloudflare.com: "2026.10.2". 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 2416842024 · primary arch.ns.cloudflare.com

Found

Primary (MNAME)
arch.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2416842024
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
arch.ns.cloudflare.com (173.245.59.68)2416842024
arch.ns.cloudflare.com (108.162.193.68)2416842024
arch.ns.cloudflare.com (172.64.33.68)2416842024
arch.ns.cloudflare.com (2803:f800:50::6ca2:c144)2416842024
arch.ns.cloudflare.com (2a06:98c1:50::ac40:2144)2416842024
arch.ns.cloudflare.com (2606:4700:58::adf5:3b44)2416842024
connie.ns.cloudflare.com (172.64.32.247)2416842024
connie.ns.cloudflare.com (108.162.192.247)2416842024
connie.ns.cloudflare.com (173.245.58.247)2416842024
connie.ns.cloudflare.com (2606:4700:50::adf5:3af7)2416842024
connie.ns.cloudflare.com (2a06:98c1:50::ac40:20f7)2416842024
connie.ns.cloudflare.com (2803:f800:50::6ca2:c0f7)2416842024

Checks

  • ✓ Serial 2416842024 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver arch.ns.cloudflare.com is one of the listed nameservers.
  • ✓ Contact dns@cloudflare.com #25
    The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
  • ✓ Timestamp serial #26
    The serial 2416842024 is a Unix timestamp (2046-08-02 17:00 UTC).

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

info

15 records at the apex

Found

Read from
173.245.59.68:53
TypeValueTTL
SOAarch.ns.cloudflare.com. dns.cloudflare.com. 2416842024 10000 2400 604800 18001800
NSarch.ns.cloudflare.com.86400
NSconnie.ns.cloudflare.com.86400
A104.26.10.220300
A172.67.73.103300
A104.26.11.220300
AAAA2606:4700:20::ac43:4967300
AAAA2606:4700:20::681a:bdc300
AAAA2606:4700:20::681a:adc300
MX10 mxpool.hostedoffice.ag.300
TXT"MS=ms50124168"300
TXT"apple-domain-verification=atrNQv6oM84ZJEHy"300
TXT"brevo-code:a9abaf59d56b1b835a8793a0b2b21410"300
TXT"sophos-domain-verification=e1218a5ce90ca38a3638b01852c82ac8c22ff425c6cd0c06a7f69c362a80f67a"300
TXT"v=spf1 include:hostedoffice.ag include:spf.crsend.com include:mailgun.org ip4:83.169.3.30 ip4:152.160.0.0/16 -all"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, NS 1d.
  • ✓ 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