magdeburg.de

Checked 21 October 2026, 23:21 UTC · via 8.8.8.8
✗Problems found
22 passed 1 warning 1 failed 5 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

colt.magdeburg.de, pns.dtag.de, secondary004.dtag.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
colt.magdeburg.de, pns.dtag.de, secondary004.dtag.net
NS in the zone
colt.magdeburg.de, pns.dtag.de, secondary004.dtag.net
NameserverAddressesNetwork (AS)Glue
colt.magdeburg.de212.184.216.8AS3320 DTAG - Deutsche Telekom AG, DE212.184.216.8
pns.dtag.de194.25.0.125 2003:40:8000::100AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE194.25.0.125 2003:40:8000::100
secondary004.dtag.net195.244.245.27 2a00:fa8:3:0:100:0:4:1AS5605 NETUSE - NetUSE AG, DE AS5605 NETUSE - NetUSE AG, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to colt.magdeburg.de, pns.dtag.de, secondary004.dtag.net.
  • ✓ 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: colt.magdeburg.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 3 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS3320 (DTAG - Deutsche Telekom AG, DE): 3 addresses; AS5605 (NETUSE - NetUSE AG, DE): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: colt.magdeburg.de.
    #13

Nameservers

fail

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
colt.magdeburg.de 212.184.216.8NOERROR, 8 ms, authoritativenono / yesrefused-
pns.dtag.de 194.25.0.125NOERROR, 9 ms, authoritativenoyes / yesrefusedDomainNameServer
pns.dtag.de 2003:40:8000::100NOERROR, 7 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary004.dtag.net 195.244.245.27NOERROR, 12 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary004.dtag.net 2a00:fa8:3:0:100:0:4:1NOERROR, 16 ms, authoritativenoyes / yesrefusedDomainNameServer

Checks

  • ✓ All respond #14
    All 5 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: pns.dtag.de: "DomainNameServer"; secondary004.dtag.net: "DomainNameServer".
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: colt.magdeburg.de (212.184.216.8): dial tcp 212.184.216.8:53: i/o timeout.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2025102456 · primary colt.magdeburg.de

Found

Primary (MNAME)
colt.magdeburg.de
Contact (RNAME)
ischuch.magdeburg.de
Serial
2025102456
Refresh / retry
86400 s / 7200 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
colt.magdeburg.de (212.184.216.8)2025102456
pns.dtag.de (194.25.0.125)2025102456
pns.dtag.de (2003:40:8000::100)2025102456
secondary004.dtag.net (195.244.245.27)2025102456
secondary004.dtag.net (2a00:fa8:3:0:100:0:4:1)2025102456

Checks

  • ✓ Serial 2025102456 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 2h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver colt.magdeburg.de is one of the listed nameservers.
  • ✓ Contact ischuch@magdeburg.de #25
    The SOA RNAME ischuch.magdeburg.de means ischuch@magdeburg.de.
  • ✓ Date-based serial #26
    The serial 2025102456 follows the YYYYMMDDnn convention (2025-10-24).

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

9 records at the apex

Found

Read from
212.184.216.8:53
TypeValueTTL
SOAcolt.magdeburg.de. ischuch.magdeburg.de. 2025102456 86400 7200 604800 8640086400
NScolt.magdeburg.de.86400
NSsecondary004.dtag.net.86400
NSpns.dtag.de.86400
A212.184.216.2986400
MX20 spamfix2.magdeburg.de.86400
MX10 spamfix.magdeburg.de.86400
TXT"v=spf1 mx ip4:212.184.216.0/25 a:otc-de-spf.mms.t-systems-service.com -all"86400
TXT"google-site-verification=C2HdrKbw6Di-2KaIaw9UHmTlfWG-sIvVt0MTzm9VnN8"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 1d, 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