rtl.be

Checked 22 October 2026, 07:10 UTC · via 8.8.8.8
!Passed with warnings
19 passed 2 warnings 0 failed 8 info

Registration

info

.be country-code

Found

TLD
.be (country-code)
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.
    #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

ns0.be.colt.net, ns1.be.colt.net

Found

Parent zone
be
Delegation from
a.nsset.be (194.0.6.1)
NS at the parent
ns0.be.colt.net, ns1.be.colt.net
NS in the zone
ns0.be.colt.net, ns1.be.colt.net
NameserverAddressesNetwork (AS)Glue
ns0.be.colt.net212.74.78.17AS8220 COLT - COLT Technology Services Group Limited, GB-
ns1.be.colt.net212.74.77.17AS8220 COLT - COLT Technology Services Group Limited, GB-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns0.be.colt.net, ns1.be.colt.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 (AS8220 (COLT - COLT Technology Services Group Limited, GB): 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

info

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns0.be.colt.net 212.74.78.17NOERROR, 4 ms, authoritativenoyes / yesrefusedColt
ns1.be.colt.net 212.74.77.17NOERROR, 17 ms, authoritativenoyes / yesrefusedColt

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns0.be.colt.net: "Colt"; ns1.be.colt.net: "Colt".
    #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 2026091402 · primary ns0.be.colt.net

Found

Primary (MNAME)
ns0.be.colt.net
Contact (RNAME)
eudnsmaster.colt.net
Serial
2026091402
Refresh / retry
43200 s / 14400 s
Expire
604800 s
Negative TTL
21600 s

Serial per nameserver

NameserverSerial
ns0.be.colt.net (212.74.78.17)2026091402
ns1.be.colt.net (212.74.77.17)2026091402

Checks

  • ✓ Serial 2026091402 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 4h, expire 7d, negative TTL 6h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns0.be.colt.net is one of the listed nameservers.
  • ✓ Contact eudnsmaster@colt.net #25
    The SOA RNAME eudnsmaster.colt.net means eudnsmaster@colt.net.
  • ✓ Date-based serial #26
    The serial 2026091402 follows the YYYYMMDDnn convention (2026-09-14).

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

21 records at the apex

Found

Read from
212.74.78.17:53
TypeValueTTL
SOAns0.be.colt.net. eudnsmaster.colt.net. 2026091402 43200 14400 604800 2160021600
NSns1.be.colt.net.21600
NSns0.be.colt.net.21600
A2.57.173.543600
MX0 rtl-be.mail.protection.outlook.com.21600
TXT"docusign=608c2ea5-829b-4757-a6bb-8695ea32d60f"3600
TXT"docusign=0b7ea41f-ff59-4d82-8a92-12742be8f20b"3600
TXT"cisco-ci-domain-verification=51f83de5c2c85e6c1ad130df446770197d8798c28632da9634833f3332214047"3600
TXT"atlassian-domain-verification=G4phBAl1y2NpXhfpnWiBmstqNOmAMFgW28IDNuQ0opGf6BYMBaRz63Zcg35Dh3R9"3600
TXT"apple-domain-verification=7lt8gFCZqVg7XFIw"3600
TXT"adobe-idp-site-verification=3abfd0f4756f7cb55460cce24d9421f8f84145bac88587d453a19a3453b4e6f5"3600
TXT"google-site-verification=00DmnwrrpB2sld65HphHnoMTRwx2Zj70UE2NJwjinqM"3600
TXT"brevo-code:b98aab0466b7ec2951f05a179f6734f5"3600
TXT"Wo39sPs6zSt1FId8UoqaRnhxVPwvgXdiXQbzTm5RL9dlIUUzbkDUliFv4JHxZ95Ao0f4EsvnOWD55ZKeP4wnrQ=="3600
TXT"v=spf1 mx a ip4:193.105.106.69 ip4:193.105.106.70 ip4:193.105.106.142 ip4:193.105.106.143 ip4:193.105.106.160 ip4:193.105.106.158 ip4:193.105.106.159 ip4:81.92.236.35 ip4:81.92.239.8 ip4:81.92.239.17 ip4:81.92.239.18 ip4:81.92.237.18 ip4:81.92.239.12 ip4:" "146.220.33.12 ip4:109.7.16.0/24 ip4:90.83.65.0/24 include:spf.protection.outlook.com include:amazonses.com include:spf.mandrillapp.com -all"3600
TXT"spf2.0/pra include:amazonses.com ~all"3600
TXT"MS=ms70749086"3600
TXT"_globalsign-domain-verification=-DXigCFgiMqDIedET8e3-5FkFNOHUaFSLGOjHrj2Ll"3600
TXT"J5A9X7KT7A90PB03CAJTD17BFA62PM0A8GGVT4Z7"3600
TXT"google-site-verification=Kde5736nOYi4d2or_C3rVPmcU4tZBvyj7tSdqpJtOqY"3600
TXT"eoZYZb8O+jfjOwXOecUGI75926N7NF4pWbfcKkNynkHEgH156XZz2risSiZevS0PWmRMwcNEt8GaebLK6wCP6A=="3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 6h, NS 6h. The NS TTL at the parent is 1d and in the zone 6h; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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