vinmec.com

Checked 22 October 2026, 11:22 UTC · via 8.8.8.8
!Passed with warnings
28 passed 1 warning 0 failed 6 info

Registration

info

.com generic · GMO Internet Group, Inc. d/b/a Onamae.com · expires 2028-03-21

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
GMO Internet Group, Inc. d/b/a Onamae.com
Registered
21 March 2011
Last changed
10 September 2026
Expires
21 March 2028
Status
active
Registry nameservers
gemma.ns.cloudflare.com, will.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 2028-03-21 #3
    The registration is valid until 2028-03-21 (515 days).
  • i
    No transfer lock
    The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.
    #4
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

gemma.ns.cloudflare.com, will.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
gemma.ns.cloudflare.com, will.ns.cloudflare.com
NS in the zone
gemma.ns.cloudflare.com, will.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
gemma.ns.cloudflare.com108.162.194.27 172.64.34.27 162.159.38.27 2803:f800:50::6ca2:c21b 2a06:98c1:50::ac40:221b 2606:4700:50::a29f:261bAS13335 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., US108.162.194.27 162.159.38.27 172.64.34.27 2606:4700:50::a29f:261b 2803:f800:50::6ca2:c21b 2a06:98c1:50::ac40:221b
will.ns.cloudflare.com173.245.59.149 108.162.193.149 172.64.33.149 2803:f800:50::6ca2:c195 2606:4700:58::adf5:3b95 2a06:98c1:50::ac40:2195AS13335 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., US108.162.193.149 172.64.33.149 173.245.59.149 2606:4700:58::adf5:3b95 2803:f800:50::6ca2:c195 2a06:98c1:50::ac40:2195

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: gemma.ns.cloudflare.com, will.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
gemma.ns.cloudflare.com 108.162.194.27NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
gemma.ns.cloudflare.com 172.64.34.27NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
gemma.ns.cloudflare.com 162.159.38.27NOERROR, 33 ms, authoritativenoyes / yesrefused2026.10.2
gemma.ns.cloudflare.com 2803:f800:50::6ca2:c21bNOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
gemma.ns.cloudflare.com 2a06:98c1:50::ac40:221bNOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
gemma.ns.cloudflare.com 2606:4700:50::a29f:261bNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
will.ns.cloudflare.com 173.245.59.149NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
will.ns.cloudflare.com 108.162.193.149NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
will.ns.cloudflare.com 172.64.33.149NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
will.ns.cloudflare.com 2803:f800:50::6ca2:c195NOERROR, 20 ms, authoritativenoyes / yesrefused2026.10.2
will.ns.cloudflare.com 2606:4700:58::adf5:3b95NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
will.ns.cloudflare.com 2a06:98c1:50::ac40:2195NOERROR, 16 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: gemma.ns.cloudflare.com: "2026.10.2"; will.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 2417868932 · primary gemma.ns.cloudflare.com

Found

Primary (MNAME)
gemma.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417868932
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
gemma.ns.cloudflare.com (108.162.194.27)2417868932
gemma.ns.cloudflare.com (172.64.34.27)2417868932
gemma.ns.cloudflare.com (162.159.38.27)2417868932
gemma.ns.cloudflare.com (2803:f800:50::6ca2:c21b)2417868932
gemma.ns.cloudflare.com (2a06:98c1:50::ac40:221b)2417868932
gemma.ns.cloudflare.com (2606:4700:50::a29f:261b)2417868932
will.ns.cloudflare.com (173.245.59.149)2417868932
will.ns.cloudflare.com (108.162.193.149)2417868932
will.ns.cloudflare.com (172.64.33.149)2417868932
will.ns.cloudflare.com (2803:f800:50::6ca2:c195)2417868932
will.ns.cloudflare.com (2606:4700:58::adf5:3b95)2417868932
will.ns.cloudflare.com (2a06:98c1:50::ac40:2195)2417868932

Checks

  • ✓ Serial 2417868932 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 gemma.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 2417868932 is a Unix timestamp (2046-08-14 14:15 UTC).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC
Signatures valid until
23 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
2371ECDSAP256SHA256 (13)SHA256 FF8F07FCECCC94B8…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 10:22 UTC and expires at 2026-10-23 12:22 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

pass

36 records at the apex

Found

Read from
108.162.194.27:53
TypeValueTTL
SOAgemma.ns.cloudflare.com. dns.cloudflare.com. 2417868932 10000 2400 604800 18001800
NSgemma.ns.cloudflare.com.86400
NSwill.ns.cloudflare.com.86400
A104.18.31.226300
A104.18.30.226300
AAAA2606:4700::6812:1ee2300
AAAA2606:4700::6812:1fe2300
MX10 mail-in1.vingroup.net.300
MX10 mail-in2.vingroup.net.300
MX10 mail-in3.vingroup.net.300
MX10 mail-in4.vingroup.net.300
TXT"00D5g000003bZrA=1TBfC00000005fg"300
TXT"00DGC000004RmC5=1TBfR00000006bk"300
TXT"00DIo000000H05d=1TBBW00000006S1"300
TXT"00Dff0000000RrR=1TBff00000002TG"300
TXT"MS=ms16519118"300
TXT"SFMC-OxUufLoMa17yEzyoyRYuG85FEoWeHnNgrpxG2Jv1"300
TXT"_globalsign-domain-verification=RvrNkPom9RcUKYjzh5ZAJj-1nUQWZIMgozEsz9YLT-"300
TXT"anthropic-domain-verification-ctqhpv=QIlhXHKnyYlowD9yZH9Znkm9v"300
TXT"google-gws-recovery-domain-verification=56409381"300
TXT"google-site-verification=7hhu5-VENdMk-IHWf-raRipPpJQ-hQuZenrCeUMvoHc"300
TXT"google-site-verification=UcuDtIhfmcrA40mwP4Vk99Rwe1bMDpjqmnElfcMsq3Q"300
TXT"knowbe4-site-verification=bda656c81e11b2028e13a6bccdcc37d5"300
TXT"v=spf1 ip4:103.238.211.137 ip4:103.238.210.11 mx:mail01.hn.vincomjsc.com mx:mail02.hn.vincomjsc.com include:spf.protection.outlook.com include:spf.vingroup.net include:mailgun.org -all"300
CAA0 issue "comodoca.com"300
CAA0 issue "digicert.com; cansignhttpexchanges=yes"300
CAA0 issue "globalsign.com"300
CAA0 issue "letsencrypt.org"300
CAA0 issue "pki.goog; cansignhttpexchanges=yes"300
CAA0 issue "ssl.com"300
CAA0 issuewild "comodoca.com"300
CAA0 issuewild "digicert.com; cansignhttpexchanges=yes"300
CAA0 issuewild "globalsign.com"300
CAA0 issuewild "letsencrypt.org"300
CAA0 issuewild "pki.goog; cansignhttpexchanges=yes"300
CAA0 issuewild "ssl.com"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.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: comodoca.com, digicert.com, globalsign.com, letsencrypt.org, pki.goog, ssl.com.