absolventa.de

Checked 21 October 2026, 21:27 UTC · via 8.8.8.8
!Passed with warnings
23 passed 2 warnings 0 failed 4 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

ns1.dnsimple-edge.com, ns2.dnsimple-edge.net, ns3.dnsimple-edge.io, ns4.dnsimple-edge.org

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.dnsimple-edge.com, ns2.dnsimple-edge.net, ns3.dnsimple-edge.io, ns4.dnsimple-edge.org
NS in the zone
ns1.dnsimple-edge.com, ns2.dnsimple-edge.net, ns3.dnsimple-edge.io, ns4.dnsimple-edge.org
NameserverAddressesNetwork (AS)Glue
ns1.dnsimple-edge.com199.247.152.53 2620:111:8004::53AS32771 DNSIMPLE - DNSimple Corporation, US AS32771 DNSIMPLE - DNSimple Corporation, US-
ns2.dnsimple-edge.net199.247.153.53 2620:111:8005::53AS32771 DNSIMPLE - DNSimple Corporation, US AS32771 DNSIMPLE - DNSimple Corporation, US-
ns3.dnsimple-edge.io199.247.154.53 2620:111:8006::53AS32771 DNSIMPLE - DNSimple Corporation, US AS32771 DNSIMPLE - DNSimple Corporation, US-
ns4.dnsimple-edge.org199.247.155.53 2620:111:8007::53AS32771 DNSIMPLE - DNSimple Corporation, US AS32771 DNSIMPLE - DNSimple Corporation, US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.dnsimple-edge.com, ns2.dnsimple-edge.net, ns3.dnsimple-edge.io, ns4.dnsimple-edge.org.
  • ✓ 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 4 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS32771 (DNSIMPLE - DNSimple Corporation, US): 8 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .com, .io, .net, .org.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.dnsimple-edge.com 199.247.152.53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns1.dnsimple-edge.com 2620:111:8004::53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns2.dnsimple-edge.net 199.247.153.53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns2.dnsimple-edge.net 2620:111:8005::53NOERROR, 16 ms, authoritativenoyes / yesrefused-
ns3.dnsimple-edge.io 199.247.154.53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns3.dnsimple-edge.io 2620:111:8006::53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns4.dnsimple-edge.org 199.247.155.53NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns4.dnsimple-edge.org 2620:111:8007::53NOERROR, 13 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 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 1422892462 · primary ns1.dnsimple-edge.com

Found

Primary (MNAME)
ns1.dnsimple-edge.com
Contact (RNAME)
admin.dnsimple.com
Serial
1422892462
Refresh / retry
86400 s / 10800 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns1.dnsimple-edge.com (199.247.152.53)1422892462
ns1.dnsimple-edge.com (2620:111:8004::53)1422892462
ns2.dnsimple-edge.net (199.247.153.53)1422892462
ns2.dnsimple-edge.net (2620:111:8005::53)1422892462
ns3.dnsimple-edge.io (199.247.154.53)1422892462
ns3.dnsimple-edge.io (2620:111:8006::53)1422892462
ns4.dnsimple-edge.org (199.247.155.53)1422892462
ns4.dnsimple-edge.org (2620:111:8007::53)1422892462

Checks

  • ✓ Serial 1422892462 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 3h, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.dnsimple-edge.com is one of the listed nameservers.
  • ✓ Contact admin@dnsimple.com #25
    The SOA RNAME admin.dnsimple.com means admin@dnsimple.com.
  • ✓ Timestamp serial #26
    The serial 1422892462 is a Unix timestamp (2015-02-02 15:54 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

warn

27 records at the apex

Found

Read from
199.247.152.53:53
TypeValueTTL
SOAns1.dnsimple-edge.com. admin.dnsimple.com. 1422892462 86400 10800 604800 3003600
NSns1.dnsimple-edge.com.3600
NSns2.dnsimple-edge.net.3600
NSns3.dnsimple-edge.io.3600
NSns4.dnsimple-edge.org.3600
A13.227.173.1060
A13.227.173.3860
A13.227.173.10460
A13.227.173.11360
AAAA2600:9000:21f7:1c00:d:f7d2:2740:93a160
AAAA2600:9000:21f7:3200:d:f7d2:2740:93a160
AAAA2600:9000:21f7:3600:d:f7d2:2740:93a160
AAAA2600:9000:21f7:4400:d:f7d2:2740:93a160
AAAA2600:9000:21f7:8a00:d:f7d2:2740:93a160
AAAA2600:9000:21f7:ae00:d:f7d2:2740:93a160
AAAA2600:9000:21f7:d000:d:f7d2:2740:93a160
AAAA2600:9000:21f7:f800:d:f7d2:2740:93a160
MX0 absolventa-de.mail.protection.outlook.com.3600
TXT"10xyss1w2tfx2rzm7wcbn386t3rk0hmw"3600
TXT"1password-site-verification=DXH3SRZXARCVZFNNK7DW43IRAY"3600
TXT"MS=ms30267430"3600
TXT"facebook-domain-verification=g2106x0mipgtskrzbfqazoh9pplapv"3600
TXT"google-site-verification=pabELCn6DrkEAgdfVOSNxc4mPtvCT-aJZ9kRnvcpM0M"3600
TXT"pardot1083292=8a5f3395403cb9cb92da2d827a04c4eb7daa42a7049619754a28314c0552181d"3600
TXT"qmnf3y63mxx4559zqw34rvbhk9klvk04"3600
TXT"sending_domain1083292=7956e8f7576c2c894427d7beeb51920d59a034c67061f7b604fc62999fa61633"3600
TXT"v=spf1 include:_spf.eu.sparkpostmail.com include:spf.protection.outlook.com include:spf.funkemedien.de -all"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m), AAAA (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 1h; resolvers may use either.
    #32
  • ✓ 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