sendinblue.com

Checked 22 October 2026, 10:40 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 7 info

Registration

info

.com generic · OVH sas · expires 2028-11-12

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
OVH sas
Registered
12 November 2013
Last changed
1 November 2025
Expires
12 November 2028
Status
client delete prohibited, client transfer prohibited
Registry nameservers
josh.ns.cloudflare.com, mary.ns.cloudflare.com
RDAP server
https://rdap.verisign.com/com/v1/

Checks

  • i
    .com is a generic TLD (gTLD)
    Generic TLD under an ICANN registry agreement: ICANN-accredited registrars, UDRP and RDAP apply.
    #1
  • ✓ TLD delegated and signed #2
    .com is delegated in the root zone and DNSSEC-signed.
  • ✓ Expires on 2028-11-12 #3
    The registration is valid until 2028-11-12 (752 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

josh.ns.cloudflare.com, mary.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
josh.ns.cloudflare.com, mary.ns.cloudflare.com
NS in the zone
josh.ns.cloudflare.com, mary.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
josh.ns.cloudflare.com108.162.193.126 172.64.33.126 173.245.59.126 2a06:98c1:50::ac40:217e 2803:f800:50::6ca2:c17e 2606:4700:58::adf5:3b7eAS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.193.126 172.64.33.126 173.245.59.126 2606:4700:58::adf5:3b7e 2803:f800:50::6ca2:c17e 2a06:98c1:50::ac40:217e
mary.ns.cloudflare.com172.64.32.134 108.162.192.134 173.245.58.134 2a06:98c1:50::ac40:2086 2606:4700:50::adf5:3a86 2803:f800:50::6ca2:c086AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.192.134 172.64.32.134 173.245.58.134 2606:4700:50::adf5:3a86 2803:f800:50::6ca2:c086 2a06:98c1:50::ac40:2086

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: josh.ns.cloudflare.com, mary.ns.cloudflare.com.
    #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 6 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 12 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 .com
    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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
josh.ns.cloudflare.com 108.162.193.126NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
josh.ns.cloudflare.com 172.64.33.126NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
josh.ns.cloudflare.com 173.245.59.126NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
josh.ns.cloudflare.com 2a06:98c1:50::ac40:217eNOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
josh.ns.cloudflare.com 2803:f800:50::6ca2:c17eNOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
josh.ns.cloudflare.com 2606:4700:58::adf5:3b7eNOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
mary.ns.cloudflare.com 172.64.32.134NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
mary.ns.cloudflare.com 108.162.192.134NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
mary.ns.cloudflare.com 173.245.58.134NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
mary.ns.cloudflare.com 2a06:98c1:50::ac40:2086NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
mary.ns.cloudflare.com 2606:4700:50::adf5:3a86NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
mary.ns.cloudflare.com 2803:f800:50::6ca2:c086NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2

Checks

  • ✓ All respond #14
    All 12 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: josh.ns.cloudflare.com: "2026.10.2"; mary.ns.cloudflare.com: "2026.10.2". Hide or replace the version string.
    #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 2418083959 · primary josh.ns.cloudflare.com

Found

Primary (MNAME)
josh.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2418083959
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
josh.ns.cloudflare.com (108.162.193.126)2418083959
josh.ns.cloudflare.com (172.64.33.126)2418083959
josh.ns.cloudflare.com (173.245.59.126)2418083959
josh.ns.cloudflare.com (2a06:98c1:50::ac40:217e)2418083959
josh.ns.cloudflare.com (2803:f800:50::6ca2:c17e)2418083959
josh.ns.cloudflare.com (2606:4700:58::adf5:3b7e)2418083959
mary.ns.cloudflare.com (172.64.32.134)2418083959
mary.ns.cloudflare.com (108.162.192.134)2418083959
mary.ns.cloudflare.com (173.245.58.134)2418083959
mary.ns.cloudflare.com (2a06:98c1:50::ac40:2086)2418083959
mary.ns.cloudflare.com (2606:4700:50::adf5:3a86)2418083959
mary.ns.cloudflare.com (2803:f800:50::6ca2:c086)2418083959

Checks

  • ✓ Serial 2418083959 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver josh.ns.cloudflare.com is one of the listed nameservers.
  • ✓ Contact dns@cloudflare.com #25
    The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
  • ✓ Timestamp serial #26
    The serial 2418083959 is a Unix timestamp (2046-08-17 01:59 UTC).

DNSSEC

warn

Signed, but no DS at parent

Found

Validated by resolver
no
Denial of existence
NSEC
Signatures valid until
23 October 2026

DNSKEY in the zone

Key tagRoleAlgorithm
2371KSK (257)ECDSAP256SHA256 (13)
34505ZSK (256)ECDSAP256SHA256 (13)

Checks

  • !
    Signed but not delegated securely
    The zone is signed but the parent has no DS record, so the signatures are not used. Publish the DS record at your registrar.
    #27
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 50h0m0s and created on demand; the current one was made at 2026-10-21 09:40 UTC and expires at 2026-10-23 11:40 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

info

25 records at the apex

Found

Read from
108.162.193.126:53
TypeValueTTL
SOAjosh.ns.cloudflare.com. dns.cloudflare.com. 2418083959 10000 2400 604800 18001800
NSjosh.ns.cloudflare.com.86400
NSmary.ns.cloudflare.com.86400
A104.18.249.233300
A104.18.250.233300
AAAA2606:4700::6812:f9e9300
AAAA2606:4700::6812:fae9300
MX10 aspmx.l.google.com.300
MX20 alt1.aspmx.l.google.com.300
MX20 alt2.aspmx.l.google.com.300
MX30 aspmx2.googlemail.com.300
MX30 aspmx3.googlemail.com.300
TXT"Dynatrace-site-verification=edcc36bd-b0ca-4607-a9b7-57d99de51a34__n6h08b16prh9umu5i8bo1j7fap"300
TXT"Sendinblue-code:5652fec247bb9d181ee2f1803fd6b8b3"300
TXT"ca3-a873098ca3594e2386929a8a38d6811b"300
TXT"ca3-c59b7e5f7ef84859992a6caeaf5d5875"300
TXT"google-site-verification=7OA_tktPgFSjLgrysutcNOGbuylDElfDs0Kyel00D3M"300
TXT"google-site-verification=9yBLtla0Z3xaHuRoduL772IKdVJhxzsmzm3S4EQwhJ8"300
TXT"google-site-verification=WJ3vxU2UgdaX9n9Evq7ajTjkT01NFW4V9BZibaCd2nc"300
TXT"google-site-verification=l46ZA5_ERC3Wr_wB8hkAkh8vZ3tAqF95oysXMHrgevI"300
TXT"have-i-been-pwned-verification=9b1658ea551d17ba902346c3c41477eb"300
TXT"mailru-verification: 449769ae597a243f"300
TXT"slack-domain-verification=SizvdH3mtzqqrlIfHD2OjO4JeDVchi6MipGhutps"300
TXT"v=spf1 include:spf.sendinblue.com include:mail.zendesk.com include:_spf.google.com include:spf.mail.intercom.io ip4:52.38.191.241 ~all"300
TXT"yahoo-verification-key=hapmGYVLa+6SVDLLYshHnNeO8I/Lh4rvoFDFdb74SdA="300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, NS 1d. The NS TTL at the parent is 2d and in the zone 1d; 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