simdif.com

Checked 22 October 2026, 10:42 UTC · via 8.8.8.8
!Passed with warnings
27 passed 1 warning 0 failed 6 info

Registration

info

.com generic · OVH sas · expires 2027-09-30

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
OVH sas
Registered
30 September 2009
Last changed
1 October 2026
Expires
30 September 2027
Status
client delete prohibited, client transfer prohibited
Registry nameservers
augustus.ns.cloudflare.com, linda.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 2027-09-30 #3
    The registration is valid until 2027-09-30 (342 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

augustus.ns.cloudflare.com, linda.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
augustus.ns.cloudflare.com, linda.ns.cloudflare.com
NS in the zone
augustus.ns.cloudflare.com, linda.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
augustus.ns.cloudflare.com172.64.35.2 108.162.195.2 162.159.44.2 2a06:98c1:50::ac40:2302 2803:f800:50::6ca2:c302 2606:4700:58::a29f:2c02AS13335 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., US108.162.195.2 162.159.44.2 172.64.35.2 2606:4700:58::a29f:2c02 2803:f800:50::6ca2:c302 2a06:98c1:50::ac40:2302
linda.ns.cloudflare.com172.64.32.250 173.245.58.250 108.162.192.250 2606:4700:50::adf5:3afa 2803:f800:50::6ca2:c0fa 2a06:98c1:50::ac40:20faAS13335 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., US108.162.192.250 172.64.32.250 173.245.58.250 2606:4700:50::adf5:3afa 2803:f800:50::6ca2:c0fa 2a06:98c1:50::ac40:20fa

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: augustus.ns.cloudflare.com, linda.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
augustus.ns.cloudflare.com 172.64.35.2NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
augustus.ns.cloudflare.com 108.162.195.2NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
augustus.ns.cloudflare.com 162.159.44.2NOERROR, 32 ms, authoritativenoyes / yesrefused2026.10.2
augustus.ns.cloudflare.com 2a06:98c1:50::ac40:2302NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
augustus.ns.cloudflare.com 2803:f800:50::6ca2:c302NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
augustus.ns.cloudflare.com 2606:4700:58::a29f:2c02NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
linda.ns.cloudflare.com 172.64.32.250NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
linda.ns.cloudflare.com 173.245.58.250NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
linda.ns.cloudflare.com 108.162.192.250NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
linda.ns.cloudflare.com 2606:4700:50::adf5:3afaNOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
linda.ns.cloudflare.com 2803:f800:50::6ca2:c0faNOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
linda.ns.cloudflare.com 2a06:98c1:50::ac40:20faNOERROR, 5 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: augustus.ns.cloudflare.com: "2026.10.2"; linda.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 2417698291 · primary augustus.ns.cloudflare.com

Found

Primary (MNAME)
augustus.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417698291
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
augustus.ns.cloudflare.com (172.64.35.2)2417698291
augustus.ns.cloudflare.com (108.162.195.2)2417698291
augustus.ns.cloudflare.com (162.159.44.2)2417698291
augustus.ns.cloudflare.com (2a06:98c1:50::ac40:2302)2417698291
augustus.ns.cloudflare.com (2803:f800:50::6ca2:c302)2417698291
augustus.ns.cloudflare.com (2606:4700:58::a29f:2c02)2417698291
linda.ns.cloudflare.com (172.64.32.250)2417698291
linda.ns.cloudflare.com (173.245.58.250)2417698291
linda.ns.cloudflare.com (108.162.192.250)2417698291
linda.ns.cloudflare.com (2606:4700:50::adf5:3afa)2417698291
linda.ns.cloudflare.com (2803:f800:50::6ca2:c0fa)2417698291
linda.ns.cloudflare.com (2a06:98c1:50::ac40:20fa)2417698291

Checks

  • ✓ Serial 2417698291 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 augustus.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 2417698291 is a Unix timestamp (2046-08-12 14:51 UTC).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver
yes
Signatures valid until
23 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
2371ECDSAP256SHA256 (13)SHA256 468757F072729B4C…yes

DNSKEY in the zone

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

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 2371 (SHA256).
  • ✓ 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 09:42 UTC and expires at 2026-10-23 11:42 UTC.

Records

info

13 records at the apex

Found

Read from
172.64.35.2:53
TypeValueTTL
SOAaugustus.ns.cloudflare.com. dns.cloudflare.com. 2417698291 10000 2400 604800 18001800
NSaugustus.ns.cloudflare.com.86400
NSlinda.ns.cloudflare.com.86400
A104.26.1.59300
A172.67.73.149300
A104.26.0.59300
AAAA2606:4700:20::681a:3b300
AAAA2606:4700:20::681a:13b300
AAAA2606:4700:20::ac43:4995300
MX10 mta01.simdif.com.300
TXT"facebook-domain-verification=bbs58f9u0k2ju76dmpi65b5hynk9wp"300
TXT"google-site-verification=p5ehz-MDS2ZGWXVJOJpVpnKOtksUI-jf91JtUoMTfH4"300
TXT"v=spf1 ip4:178.33.66.216 ip4:178.32.190.185 ip4:178.32.190.186 ~all"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