bumm.de

Checked 21 October 2026, 22:00 UTC · via 8.8.8.8
!Passed with warnings
20 passed 3 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

warn

ns.i-s-o.net, ns2.i-s-o.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.i-s-o.net, ns2.i-s-o.net
NS in the zone
ns.i-s-o.net, ns2.i-s-o.net
NameserverAddressesNetwork (AS)Glue
ns.i-s-o.net5.35.253.57AS8972 GD-EMEA-DC-SXB1 - Host Europe GmbH, DE-
ns2.i-s-o.net37.61.204.54AS8972 GD-EMEA-DC-SXB1 - Host Europe GmbH, DE-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns.i-s-o.net, ns2.i-s-o.net.
    #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 2 IPv4 /24s and 0 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS8972 (GD-EMEA-DC-SXB1 - Host Europe GmbH, DE): 2 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 .net
    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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

warn

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.i-s-o.net 5.35.253.57NOERROR, 7 ms, authoritativenoyes / norefused-
ns2.i-s-o.net 37.61.204.54NOERROR, 7 ms, authoritativenoyes / norefused-

Checks

  • ✓ All respond #14
    All 2 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.
  • !
    No EDNS
    These nameservers don't support EDNS(0), needed for DNSSEC and answers larger than 512 bytes: ns.i-s-o.net (5.35.253.57), ns2.i-s-o.net (37.61.204.54).
    #20
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026091700 · primary ns.i-s-o.net

Found

Primary (MNAME)
ns.i-s-o.net
Contact (RNAME)
technik.multimediahaus.de
Serial
2026091700
Refresh / retry
48200 s / 7200 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns.i-s-o.net (5.35.253.57)2026091700
ns2.i-s-o.net (37.61.204.54)2026091700

Checks

  • ✓ Serial 2026091700 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 13h23m20s, retry 2h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.i-s-o.net is one of the listed nameservers.
  • ✓ Contact technik@multimediahaus.de #25
    The SOA RNAME technik.multimediahaus.de means technik@multimediahaus.de.
  • ✓ Date-based serial #26
    The serial 2026091700 follows the YYYYMMDDnn convention (2026-09-17).

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

8 records at the apex

Found

Read from
5.35.253.57:53
TypeValueTTL
SOAns.i-s-o.net. technik.multimediahaus.de. 2026091700 48200 7200 604800 864003600
NSns.i-s-o.net.3600
NSns2.i-s-o.net.3600
A167.235.54.13600
MX0 bumm-de.mail.protection.outlook.com.3600
TXT"MS=ms49095195"3600
TXT"v=spf1 a ip4:80.151.20.64 ip4:62.55.182.68 ip4:89.110.144.67 include:spf.protection.outlook.com -all"300
TXT"lmc=13816878-24bb-4e3f-8192-1397a9ad752f"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 1h, NS 1h. The NS TTL at the parent is 1d and in the zone 1h; 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