questdiagnostics.com

Checked 22 October 2026, 10:24 UTC · via 8.8.8.8
!Passed with warnings
24 passed 3 warnings 0 failed 4 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2027-04-11

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
10 April 1997
Last changed
7 April 2026
Expires
11 April 2027
Status
client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
ns1.questdiagnostics.com, ns11.questdiagnostics.com, ns12.questdiagnostics.com, ns3.questdiagnostics.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 2027-04-11 #3
    The registration is valid until 2027-04-11 (170 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

ns1.questdiagnostics.com, ns11.questdiagnostics.com, ns12.questdiagnostics.com, ns3.questdiagnostics.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.questdiagnostics.com, ns11.questdiagnostics.com, ns12.questdiagnostics.com, ns3.questdiagnostics.com
NS in the zone
ns1.questdiagnostics.com, ns11.questdiagnostics.com, ns12.questdiagnostics.com, ns3.questdiagnostics.com
NameserverAddressesNetwork (AS)Glue
ns1.questdiagnostics.com216.203.80.72AS27021 AS-DGX - Quest Diagnostics, Inc., US216.203.83.234
ns11.questdiagnostics.com216.203.95.72AS27021 AS-DGX - Quest Diagnostics, Inc., US216.203.95.72
ns12.questdiagnostics.com216.203.95.73AS27021 AS-DGX - Quest Diagnostics, Inc., US216.203.95.73
ns3.questdiagnostics.com216.203.80.73AS27021 AS-DGX - Quest Diagnostics, Inc., US216.203.80.73

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.questdiagnostics.com, ns11.questdiagnostics.com, ns12.questdiagnostics.com, ns3.questdiagnostics.com.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: ns1.questdiagnostics.com (glue 216.203.83.234, zone 216.203.80.72). Update the glue at your registrar.
    #8
  • ✓ 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 (AS27021 (AS-DGX - Quest Diagnostics, Inc., US): 4 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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.questdiagnostics.com 216.203.80.72NOERROR, 94 ms, authoritativenoyes / yesrefused-
ns11.questdiagnostics.com 216.203.95.72NOERROR, 128 ms, authoritativenoyes / yesrefused-
ns12.questdiagnostics.com 216.203.95.73NOERROR, 128 ms, authoritativenoyes / yesrefused-
ns3.questdiagnostics.com 216.203.80.73NOERROR, 92 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 4 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

info

serial 2019014358 · primary ib-grid.qdx.com

Found

Primary (MNAME)
ib-grid.qdx.com
Contact (RNAME)
domain-tech.questdiagnostics.com
Serial
2019014358
Refresh / retry
10800 s / 3600 s
Expire
2419200 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
ns1.questdiagnostics.com (216.203.80.72)2019014358
ns11.questdiagnostics.com (216.203.95.72)2019014358
ns12.questdiagnostics.com (216.203.95.73)2019014358
ns3.questdiagnostics.com (216.203.80.73)2019014358

Checks

  • ✓ Serial 2019014358 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 28d, negative TTL 15m.
  • i
    Hidden master (not resolvable)
    The primary nameserver ib-grid.qdx.com is not listed as a nameserver and does not resolve publicly: a hidden master, or a placeholder name. Some tools (e.g. dynamic updates) use MNAME to find the primary.
    #24
  • ✓ Contact domain-tech@questdiagnostics.com #25
    The SOA RNAME domain-tech.questdiagnostics.com means domain-tech@questdiagnostics.com.
  • ✓ Timestamp serial #26
    The serial 2019014358 is a Unix timestamp (2033-12-24 05:19 UTC).

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

pass

52 records at the apex

Found

Read from
216.203.80.72:53
TypeValueTTL
SOAib-grid.qdx.com. domain-tech.questdiagnostics.com. 2019014358 10800 3600 2419200 900600
NSns3.questdiagnostics.com.600
NSns11.questdiagnostics.com.600
NSns12.questdiagnostics.com.600
NSns1.questdiagnostics.com.600
A52.232.227.90300
MX20 cluster4a.us.messagelabs.com.172800
MX10 cluster4.us.messagelabs.com.172800
TXT"_ess38okg1jxjor9rq59j0tf8hwkwpbg"600
TXT"MS=ms67858035"600
TXT"MS=ms11058552"600
TXT"QxDTDTWFa4pJugxQutyqb5BFYH0fO0d6gmB9z56NVoS+ifN8ab0eGMOD24M4gm5uuxv95Fr4Y/2GOc/+XWjJIg=="600
TXT"google-site-verification=zPaAV3wZTYaXQs-LfFFDJqw6ZOK7Ky0kgDTJw1hXWlU"600
TXT"docusign=8af2e051-c6e0-40bd-898b-e8aa1c421f20"600
TXT"docusign=bd264cc9-688a-441b-87db-85c39dabd4ef"600
TXT"TBj6xlrJxda242StL4v+Kl4zWcq2BxJoJLHShDmdee0o4ESx0LQTib3JlRsPbNX9BnEm0mQe4jaNvZ7C9xxEHQ=="600
TXT"adobe-idp-site-verification=7f64bf40e9628296979cf87278218eaf685fda6fa67383a33513b852c3060c3b"600
TXT"google-site-verification=JV7NOkJf5i7c0BxvP45nMnlsTXnBmYrZ2PDi3lbJ_so"600
TXT"Dynatrace-site-verification=a020fcd7-82c4-4895-9f2c-cfae793f32ef__4k18p905dd3vok5dh2e13limbg"600
TXT"onetrust-domain-verification=da2f0baa1e2e4fa9a82946ab0f3942b5"600
TXT"onetrust-domain-verification=cb03b5348d554fcaa5347e773c44a5e5"600
TXT"apple-domain-verification=nruWP4efHrYigBPK"600
TXT"apple-domain-verification=uEk1tgx5xbOx6a57"600
TXT"apple-domain-verification=v0VinpOytrD9ogvn"600
TXT"smartsheet-site-validation=GGJZAr-N8O-eWaTT5yIFQk5NjdifUDSA"600
TXT"amazonses:8rS7RoawNHHT51o0WBfCMOHwGcjFTZ9uKw/Wwr/O0QI="600
TXT"intersight=49a6f7a9e25781b50bb7b57010fc4d6818daed0842640a345a297ffab7518bea"600
TXT"wiz-domain-verification=abcdef1234567890abcdef1234567890abcdef1234567890"600
TXT"onetrust-domain-verification=9d1493407dfb45b2bc4d8e6d3119a654"600
TXT"atlassian-domain-verification=hUoLqwVkin8T0OLIrlGxBE77X4GiJ26a/6folkY0p6QDZHM8K8UOWdej6RyTNHmC"600
TXT"stripe-verification=0e7043ca67014a07cc4ecf3b6a2a77514bb7124a2a6647013c74c472cc95316e"600
TXT"AbCH3t0TUzvhxBIZWJvE8a+C2ys6G6kCJxloMB++7IiXwxN3il0wD1vJXBPaeoOoiIYj8vK1ftDsSwnhDp5sIQ=="600
TXT"google-site-verification=syvsJQGGFWV1iQV3e5hWQhLZgbT-dJDhCd_EdzzH29I"600
TXT"google-gws-recovery-domain-verification=54850844"600
TXT"cisco-ci-domain-verification=9137245383a361d235028354c49aec77c545c300a71af9f070384cc28aa617c"600
TXT"_rzkn3d6optr8v1tcx01lpk5g1fyrmsj"600
TXT"_qzzhmqm33t6j43ns1q9pw4es7zehx7c"600
TXT"teamviewer-sso-verification=ece4aaed3aad43719274437c5b8613ac"600
TXT"mixpanel-domain-verify=cfcc7595-8be5-4760-9470-c975bf60c567"600
TXT"_6j15caqw6shvh4xyg1ue593uqbawpn7"600
TXT"sprout-social-76982269-3fdf-46af-8bac-a82fe22088c4"600
TXT"jamf-site-verification=Y15JZVg51lY_h3PoPjyeEw"600
TXT"00D30000000JXlH=1TBVt000000032j"600
TXT"00DWe000004P4Nt=1TBWe00000004tI"600
TXT"v=spf1 include:spf1.questdiagnostics.com include:spf2.questdiagnostics.com -all"600
CAA0 issue "pki.goog; cansignhttpexchanges=yes"600
CAA0 issue "letsencrypt.org"600
CAA0 issue "digicert.com; account=97d8cb21ded856f534dc92b1c92f5916fa401221a6e28bf2d05e743d2fdb2455"600
CAA0 issue "digicert.com; account=51136c3c2f6cbdb54ec04cce1281652aa6ebf113e2277e32dc2b9e35560e7953"600
CAA0 issue "pki.goog"600
CAA0 issue "amazon.com"600
CAA0 issue "awstrust.com"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 2d, NS 10m. The NS TTL at the parent is 2d and in the zone 10m; 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: pki.goog, letsencrypt.org, digicert.com, amazon.com, awstrust.com.