ulb.ac.be

Checked 22 October 2026, 07:20 UTC · via 8.8.8.8
!Passed with warnings
18 passed 4 warnings 0 failed 7 info

Registration

info

.be country-code

Found

TLD
.be (country-code)
Public suffix
.ac.be
ICANN policies apply
no

Checks

  • i
    .be 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. Domains are registered under the public suffix .ac.be.
    #1
  • ✓ TLD delegated and signed #2
    .be is delegated in the root zone and DNSSEC-signed.
  • i
    Registration data not available
    No registration data via RDAP: the registry of .be offers no RDAP service. Many ccTLD registries don't offer RDAP; check the registry's WHOIS instead.
    #3

Delegation

warn

ns1.ulb.ac.be, ns2.ulb.ac.be

Found

Parent zone
ac.be
Delegation from
ns1.belnet.be (193.190.198.14)
NS at the parent
ns1.ulb.ac.be, ns2.ulb.ac.be
NS in the zone
ns1.ulb.ac.be, ns2.ulb.ac.be
NameserverAddressesNetwork (AS)Glue
ns1.ulb.ac.be164.15.254.1AS2611 BELNET - BELNET, BE164.15.254.1
ns2.ulb.ac.be164.15.254.5AS2611 BELNET - BELNET, BE164.15.254.5

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.ulb.ac.be, ns2.ulb.ac.be.
    #6
  • ✓ 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: ns1.ulb.ac.be, ns2.ulb.ac.be.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • !
    Nameservers in one network
    all IPv4 addresses are in 164.15.254.0/24. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS2611 (BELNET - BELNET, BE): 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 .be
    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

pass

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.ulb.ac.be 164.15.254.1NOERROR, 18 ms, authoritativenoyes / yesrefused-
ns2.ulb.ac.be 164.15.254.5NOERROR, 13 ms, authoritativenoyes / yesrefused-

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.
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

warn

serial 36060 · primary ns1.ulb.be

Found

Primary (MNAME)
ns1.ulb.be
Contact (RNAME)
resulb.ulb.ac.be
Serial
36060
Refresh / retry
10800 s / 3600 s
Expire
3600 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns1.ulb.ac.be (164.15.254.1)36060
ns2.ulb.ac.be (164.15.254.5)36060

Checks

  • ✓ Serial 36060 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    expire 1h is shorter than 7d; secondaries stop answering too soon when the primary is down; expire 1h must be longer than refresh + retry. Current values: refresh 3h, retry 1h, expire 1h, negative TTL 5m.
    #23
  • i
    Hidden master
    The primary nameserver ns1.ulb.be is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact resulb@ulb.ac.be #25
    The SOA RNAME resulb.ulb.ac.be means resulb@ulb.ac.be.
  • ✓ Counter serial #26
    The serial 36060 is a plain counter.

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

12 records at the apex

Found

Read from
164.15.254.1:53
TypeValueTTL
SOAns1.ulb.be. resulb.ulb.ac.be. 36060 10800 3600 3600 300300
NSns2.ulb.ac.be.300
NSns1.ulb.ac.be.300
A164.15.242.30300
MX10 ulb-ac-be.mail.protection.outlook.com.300
TXT"HARICA-cgcwRiIUmmil88Z8sb9"300
TXT"druide-validation-domaine=c398e6dfa3a5e4c4d7d87bab45d0f0ab"300
TXT"v=spf1 ip4:164.15.72.90 ip4:164.15.72.253 include:spf.protection.outlook.com include:amazonses.com include:spf-eu.exlibrisgroup.com -all"300
TXT"D4SHHxmeR3C6+tJPd1HxUcNGDOl6wvGqMYohL9f0dFpPvzxyu/rPR4qJCIJqrkpy70+Wuj6Oe5uqE6+T6Io8wg=="300
TXT"MS=ms83593679"300
TXT"HARICA-ycwHZjOGcTBeSz6ZQi6"300
TXT"work-accounts-domain-verification=AtMzAJyWRJsEPd0OdBgobtgWTjD7Nu"300

Checks

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