optimizely.com

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

Registration

info

.com generic · GoDaddy.com, LLC · expires 2027-01-11

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
GoDaddy.com, LLC
Registered
11 January 2010
Last changed
11 January 2026
Expires
11 January 2027
Status
client delete prohibited, client renew prohibited, client transfer prohibited, client update prohibited
Registry nameservers
doug.ns.cloudflare.com, harmony.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 2027-01-11 #3
    The registration is valid until 2027-01-11 (80 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client renew prohibited, client transfer prohibited, client update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

doug.ns.cloudflare.com, harmony.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
doug.ns.cloudflare.com, harmony.ns.cloudflare.com
NS in the zone
doug.ns.cloudflare.com, harmony.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
doug.ns.cloudflare.com108.162.193.159 172.64.33.159 173.245.59.159 2803:f800:50::6ca2:c19f 2a06:98c1:50::ac40:219f 2606:4700:58::adf5:3b9fAS13335 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., US108.162.193.159 172.64.33.159 173.245.59.159 2606:4700:58::adf5:3b9f 2803:f800:50::6ca2:c19f 2a06:98c1:50::ac40:219f
harmony.ns.cloudflare.com162.159.38.146 172.64.34.146 108.162.194.146 2606:4700:50::a29f:2692 2803:f800:50::6ca2:c292 2a06:98c1:50::ac40:2292AS13335 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., US108.162.194.146 162.159.38.146 172.64.34.146 2606:4700:50::a29f:2692 2803:f800:50::6ca2:c292 2a06:98c1:50::ac40:2292

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: doug.ns.cloudflare.com, harmony.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
doug.ns.cloudflare.com 108.162.193.159NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
doug.ns.cloudflare.com 172.64.33.159NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
doug.ns.cloudflare.com 173.245.59.159NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
doug.ns.cloudflare.com 2803:f800:50::6ca2:c19fNOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
doug.ns.cloudflare.com 2a06:98c1:50::ac40:219fNOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
doug.ns.cloudflare.com 2606:4700:58::adf5:3b9fNOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
harmony.ns.cloudflare.com 162.159.38.146NOERROR, 32 ms, authoritativenoyes / yesrefused2026.10.2
harmony.ns.cloudflare.com 172.64.34.146NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
harmony.ns.cloudflare.com 108.162.194.146NOERROR, 4 ms, authoritativenoyes / yesrefused2026.10.2
harmony.ns.cloudflare.com 2606:4700:50::a29f:2692NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
harmony.ns.cloudflare.com 2803:f800:50::6ca2:c292NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
harmony.ns.cloudflare.com 2a06:98c1:50::ac40:2292NOERROR, 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: doug.ns.cloudflare.com: "2026.10.2"; harmony.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 2417890733 · primary doug.ns.cloudflare.com

Found

Primary (MNAME)
doug.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417890733
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
doug.ns.cloudflare.com (108.162.193.159)2417890733
doug.ns.cloudflare.com (172.64.33.159)2417890733
doug.ns.cloudflare.com (173.245.59.159)2417890733
doug.ns.cloudflare.com (2803:f800:50::6ca2:c19f)2417890733
doug.ns.cloudflare.com (2a06:98c1:50::ac40:219f)2417890733
doug.ns.cloudflare.com (2606:4700:58::adf5:3b9f)2417890733
harmony.ns.cloudflare.com (162.159.38.146)2417890733
harmony.ns.cloudflare.com (172.64.34.146)2417890733
harmony.ns.cloudflare.com (108.162.194.146)2417890733
harmony.ns.cloudflare.com (2606:4700:50::a29f:2692)2417890733
harmony.ns.cloudflare.com (2803:f800:50::6ca2:c292)2417890733
harmony.ns.cloudflare.com (2a06:98c1:50::ac40:2292)2417890733

Checks

  • ✓ Serial 2417890733 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 doug.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 2417890733 is a Unix timestamp (2046-08-14 20:18 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 7AEB48B95BE0C622…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 09:10 UTC and expires at 2026-10-23 11:10 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

warn

84 records at the apex

Found

Read from
108.162.193.159:53
TypeValueTTL
SOAdoug.ns.cloudflare.com. dns.cloudflare.com. 2417890733 10000 2400 604800 18001800
NSdoug.ns.cloudflare.com.86400
NSharmony.ns.cloudflare.com.86400
A216.150.16.6599
A216.150.1.6599
MX10 de-smtp-inbound-1.mimecast.com.120
MX20 de-smtp-inbound-2.mimecast.com.120
TXT"00D4J0000002msD=1TBPz00000000hZ"30
TXT"8x3658gpctg4h1vbnzmm2432bxsfxcz0"30
TXT"Demonstration of domain control for DigiCert order #00399883. Please send the approval email to: dogan@optimizely.com"30
TXT"Digicert Order # 00498813. Optimizely contact: Dogan Ugurlu\013\010<dogan@optimizely.com>"30
TXT"FMTFZVQRM"30
TXT"MS=ms12641694"30
TXT"MS=ms74851995"30
TXT"Verification for Edgecast SSL through Digicert. Digicert Order # 00351809. Edgecast contact: Dominic Torrez <dtorrez@edgecast.com>, Optimizely contact: Dogan Ugurlu <dogan@optimizely.com>"30
TXT"Verification for the SSL cert for help.optimizely.com Digicert Order # 00435673. Optimizely contact: Dogan Ugurlu <dogan@optimizely.com>"30
TXT"Verification for the SSL for blog.optimizely.com. Digicert Order # 00406293. Optimizely contact: Tommy Giglio <tommy@optimizely.com>"30
TXT"Verification for the SSL for maven.optimizely.com. Digicert\013\010Order # 00584621. Optimizely contact: Dogan Ugurlu\013\010<dogan@optimizely.com>"30
TXT"Verification for the SSL for www.optimizely.com. Digicert Order # 00502638. Optimizely contact: dogan@optimizely.com"30
TXT"\010atlassian-domain-verification=fVxueGq1T9CLx1FmNDg7+//C3Q8kRlgPyJ92oiCabOlE0FQgWQH4rmJubpj6v9hE"30
TXT"_globalsign-domain-verification=f-B_7ErtvSe_2e1SkhSsTab6DQA-AVd2vcvY3gqskQ"30
TXT"_globalsign-domain-verification=xACDE3CJMcS0Ud2e9XTDQ7O7axmXzPg8Mp9rDVIgaT"30
TXT"_hfsdqdgrk9jr6farwdpsbq8quhxgcov"30
TXT"adobe-idp-site-verification=edbef1f3fcf34f3db2121d4b6aa25e37b75e61879e526da209fbb3d534c1e9ba"30
TXT"amazonses:xxLSLODJvdUPkNOdqLqR2X5AnhJzIWBvgvVvH5XYwsY="30
TXT"anthropic-domain-verification-4gkavj=TJnFfngBQ8OlXRrgx0BEn6Jg8"30
TXT"apple-domain-verification=9Mq9EOa61FT430k8"30
TXT"apple-domain-verification=Q7KwgmChGjUIkAjJT8Su-e81y48GoIDKdrWJKZCflGI"30
TXT"browserstack-domain-verification=1ce32231-8d2e-47ff-a13f-b3313f9466b3"30
TXT"bugcrowd-verification=976ed661be12db673bc241ab9adedd78"30
TXT"carta-domain-verification-j5c0wv=PVHGuxCt3hpJ6mlHJnunPYJlm"30
TXT"cdn-pci.optimizely.com 8x3658gpctg4h1vbnzmm2432bxsfxcz0"30
TXT"cursor-domain-verification-t5qp01=phvHwGecfsDxZ5DGLaUpqt9QT"30
TXT"docker-verification=06453662-1054-405b-b2ee-f2d9eeb6d443"30
TXT"docker-verification=11bd769c-c17a-405b-9a6d-dad70ad9e237"30
TXT"docker-verification=4463daac-0d0c-4db8-ba57-eda20ab9f85f"30
TXT"docker-verification=4f9e8898-2616-42e6-8622-0258237a99fd"30
TXT"docker-verification=81db037f-4d8d-4b97-8480-45e23568bad7"30
TXT"docker-verification=b94f46f3-6bae-44db-8c8e-ee1ce8d49b4b"30
TXT"docker-verification=c49faaa6-b68f-4a4a-9695-97144c0ec13d"30
TXT"docker-verification=eba70851-4749-43b1-a985-f7f5d39cd100"30
TXT"docusign=5ef03274-ba7e-4497-b1c8-68822293b6df"30
TXT"docusign=78f5a0dc-5599-4771-939a-7479d9f19a15"30
TXT"dropbox-domain-verification=1gn35nocfdjx"30
TXT"facebook-domain-verification=wley07odaemi4l7vay725u95yq4g07"30
TXT"figma-domain-verification=1912c435587480ca0caf3a2a631b9a603d1924f3b3d08d196d40aef304ee7ce8-1733954230"30
TXT"gitkraken-domain-verification=428606b7bda6111075c267457625b3dc0c0efb46f5498e10270249dda69a4c05"30
TXT"google-site-verification=3p_UqtkCzX5Qgaf4Qa8vCVOADcQxlaimwxDIPDPU3J4"30
TXT"google-site-verification=4JvIJnZJei_AHvqRmTRfA0DoBo9VA96bgQSsqH0Impw"30
TXT"google-site-verification=5I-ImxYUlKGA58rILw7HPg4bhErsy6qZig37I-DQTG4"30
TXT"google-site-verification=8VsJnn0Rs_o_MWLXwQeM7Sko6U4erJzGQTmRc2Axs6M"30
TXT"google-site-verification=F9cHkOOFB7B48BIiVW5OjoWxz8olRXaP2JefPKVPYv4"30
TXT"google-site-verification=HPlj5QbZTQcYZ7ZrWKvVw6TGQ6Js8mjkP-lRHU272aY"30
TXT"google-site-verification=I398ijOehdDlmeyNnoTWkurrboteERLDPcsh0lTE5_g"30
TXT"google-site-verification=M2p2oNOfIy17Ci7kj8vS9RH4YKCf6lfxyH4aa-pro_E"30
TXT"google-site-verification=MnJ3tcQo7PaOcyYyN73AjK83tEDmOOYoV8SCT2U6oZE"30
TXT"google-site-verification=QIwh-a1egznd9cJo_qy_IC1E2qkyZCCxGPmyKMTQdQo"30
TXT"google-site-verification=RGGeHfceOB0_bznjJqtJJjVfjtUE3ZR2KpgzRfCcH90"30
TXT"google-site-verification=RNDBwtT0w-dC7jgY2h4a785AmbqEXI7epedh-8cCg1g"30
TXT"google-site-verification=YTf8W8ct20t0_Pk4CWBP3WIlzYoa-AbATixOVOSX1So"30
TXT"google-site-verification=awCCHxysSWlId2pJybFVzs-Z_YoSd2tOhGlbnu1NWsk"30
TXT"google-site-verification=bmI8Jpu2KjE37aLb4usDSXAIVPd7ueI6gUeQpAFtjXA"30
TXT"google-site-verification=fT1I_jd2XGik8XySrXwOdkUFLVt2FqmiIoVjWgkuPU8"30
TXT"google-site-verification=hAhAgheovxOO3XfPfburDkCSlbH7vMMnkySYj8kdFj8"30
TXT"google-site-verification=hY82UoEGpukg4bWtEBMnoEDu4U_kFECFAI61SyxjKek"30
TXT"google-site-verification=m6s7sFYopEJQ9Be_DjLt4DFj88Q8sYnsVnA149u6rwc"30
TXT"google-site-verification=rdgHG3OphS2vyHzppjAgA_u--2ji3VeA81Xk4CUb5Kw"30
TXT"hcp-domain-verification=2e64a27c64e94e6e763e934ce2b1a5574d32e0493348013cfa12289ec8b077b1"30
TXT"jetbrains-domain-verification=7qb4k14glpb935e05fm71x4w8"30
TXT"k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDEp2HXojOuMp8W2mYAQWb4SCkK/OCr/lyMDiN67Ib/WHjlW65xfkprr5dfFif9wwM/XCqPG8OiYlUUzdTYzod0lFAsaWInsQB9JKNXKz9TRfDlRisHQye6gTefKvwLdN8hpQ0vR40a9z1pEBhP/rjnT73bwEe+oTgmsyTLbZ3UxwIDAQAB"30
TXT"loaderio-69745689fd1dbf2e7a4fef37b749c433"30
TXT"loaderio=9f2321067d0a5ed2165da78a078a2125"30
TXT"mixpanel-domain-verify=400a27dd-7cc3-468a-8564-e4f52d40c058"30
TXT"mongodb-site-verification=9UVwoclVFO1wQoSS1RiFxUMm8F2d9tUj"30
TXT"openai-domain-verification=dv-At5TJCxtaR4p3AcFNaOZnDkn"30
TXT"protonmail-verification=2c10e0613f5e323cafcac05b050c42a119f7c0c6"30
TXT"segment-site-verification=AaQwxphohytWn6ITgojBF75WGyY6FTle"30
TXT"sinch-domain-verification=4251594e-97a0-48da-9b27-1ecd0e88d638"30
TXT"teams.optimizely.com dmb9xl3d5frmkq48vddtsf6cy73jg48c"30
TXT"tiktok-developers-site-verification=ByD4LcSV0qZsix2Klx0Nc7RAXij2HDSZ"30
TXT"v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all"30
TXT"yahoo-verification-key=rqHgBmOodEcddj/DjNqpnG8i+HAdLJTUNNmf/ewF0oU="30
TXT"zapier-domain-verification-challenge=ec9e02b0-2df0-4698-b412-b58a2e23fa8b"30
TXT"zoom-domain-verification=ZOOM_verify_18e0baa285e04b2c983733dcd83fce57"30

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m39s), MX (2m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
    #32
  • ✓ 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