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Total

DNS

Email

Security

Network

Availability

Domainbigthink.com

IPv42

IPv62

MX records5

StatusActive

Domain technical report

Big Think - Smarter, Faster

bigthink.com

Learn from the world's biggest thinkers.

Generated: 2026-08-09T00:05:59-05:00 · Cached result

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IPv42

IPv62

MX5

NS2

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

2 IPv4 address(es) detected.

✓

IPv6 (AAAA)10 / 10 pts · Dns

2 IPv6 address(es) detected.

✓

Name server redundancy20 / 20 pts · Dns

2 NS record(s); 2 or more required.

✓

SOA record10 / 10 pts · Dns

Authoritative zone record.

DNSSEC chain0 / 15 pts · Dns

Both DS and DNSKEY are required.

✓

CAA policy5 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

5 MX record(s).

✓

SPF25 / 25 pts · Mail

SPF policy published.

✓

DMARC25 / 25 pts · Mail

DMARC policy published.

✓

DKIM20 / 20 pts · Mail

A DKIM selector was verified.

MTA-STS0 / 5 pts · Mail

Mail transport policy.

TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

89 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers31 / 35 pts · Security

8 of 9 evaluated headers detected.

PTR reverse DNS0 / 30 pts · Network

PTR not detected.

✓

IPv4 diversity35 / 35 pts · Network

Two or more IPv4 addresses receive full points.

✓

IPv6 connectivity35 / 35 pts · Network

AAAA availability.

✓

DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

HTTP response0 / 40 pts · Availability

HTTP/2 403

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

2 record(s)

104.20.29.239
172.66.171.144

AAAA

2 record(s)

2606:4700:10::6814:1def
2606:4700:10::ac42:ab90

CNAME

0 record(s)

—

Not configured

MX

5 record(s)

30 aspmx2.googlemail.com.
10 aspmx.l.google.com.
20 alt1.aspmx.l.google.com.
30 aspmx3.googlemail.com.
20 alt2.aspmx.l.google.com.

TXT

16 record(s)

"anthropic-domain-verification-3yr2nb=R61RWTRp7eKATMAWS6ysnSgTL"
"_globalsign-domain-verification=2wRqY6IrIINLY7B8Qcp-qur9HsiRTO04g4gwsMmFy3"
"ZOOM_verify_skjT3dzGm8H9XEy1EOhYI2"
"v=spf1 a mx include:servers.mcsv.net include:_spf.google.com include:mailgun.org -all"
"google-site-verification=IQ0Q3-snTXtmIPmqxY4XEk-ucnIk9H_LTPldZQ384-o"
"facebook-domain-verification=imnsr6iaawlgvto58dd99ywxgdfkmr"
"_globalsign-domain-verification=oQMq_G3Amhi22taxA9iFT-dk_zHARxA27Z0jygBZzo"
"_globalsign-domain-verification=1bIUeFQan6DwxRMFkfSsKamrhvJLH8zU49c1PDyHi5"
"apple-domain-verification=Y0jnqEg4a6CbdYpz"
"MS=ms59457489"
"atlassian-domain-verification=Sy2DdmSX6vjBKYnPktlBtM0HVxilSLu427CbTKyytLpHVd9daKw3DMdjJ0ZLLP4V"
"e4bo424u3f58fnv2geanpla4r5"
"google-site-verification=Ag1fG5O40z3867zln2At8HXynDGkVy-PFYrn4TV43n8"
"p6wbgj4mp14fnw67x42pd3bjjtk60ppk"
"brave-ledger-verification=91274b2f4b86d4e567f1bfac3af2939e17f3789e9149f42a54e22b6c6a4ddfa5"
"google-site-verification=mrT_skiiLc7lMHOIVrlqYIfL_7dqokcf255Bv4E7Dqg"

NS

2 record(s)

frank.ns.cloudflare.com.
liv.ns.cloudflare.com.

SOA

1 record(s)

frank.ns.cloudflare.com. dns.cloudflare.com. 2411701539 10000 2400 604800 1800

CAA

12 record(s)

0 issue "digicert.com; cansignhttpexchanges=yes"
0 issue "pki.goog; cansignhttpexchanges=yes"
0 issuewild "pki.goog; cansignhttpexchanges=yes"
0 issue "amazon.com"
0 issue "ssl.com"
0 issue "comodoca.com"
0 issue "letsencrypt.org"
0 issuewild "digicert.com; cansignhttpexchanges=yes"
0 issuewild "amazon.com"
0 issuewild "ssl.com"
0 issuewild "comodoca.com"
0 issuewild "letsencrypt.org"

DS

0 record(s)

—

Not configured

DNSKEY

0 record(s)

—

Not configured

RRSIG

0 record(s)

—

Not configured

NSEC

0 record(s)

—

Not configured

NSEC3

0 record(s)

—

Not configured

SRV

0 record(s)

—

Not configured

NAPTR

0 record(s)

—

Not configured

TLSA

0 record(s)

—

Not configured

SSHFP

0 record(s)

—

Not configured

SPF

Configured

v=spf1 a mx include:servers.mcsv.net include:_spf.google.com include:mailgun.org -all

DMARC

Configured

v=DMARC1; p=reject; pct=100; rua=mailto:dmarc@bigthink.com

DKIM

Selector google

v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqWjWSf0C02C5azdc/6gmpGrctAKap/uPujzPHXJsm3hj7EOrfRzmGpHavwr3yOPL8/9zZv9Lm+ecvBfvP+5bTh8vM2K3ZAjoa4QmYEJ/WMozGqySDVI/lCklMQjUFYgTEYZ6jaoHHSbOudwbOMyqdscKJ5s0C6glmKFqn5+b7gRqKhfJxRdfb1qc6jbUw5ISkep4pvm2VNU9U07K+t6S/MkZjztzlcXmVqzT7DfH7zsrhQV4AB0at79yBy0H4mNuyRRWsDHMJyQoquRGXxQ6GfWWzcF2yPPcpl95sSc0R7p3XfGPDczm+hA9lqGpSsE9idMhrcG4XO8qNCQgtFBhoQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Big Think - Smarter, Faster

Description

Learn from the world's biggest thinkers.

Final URL

https://bigthink.com/

HTTP status

200

HTTP

Status

HTTP/2 403

Final URL

https://bigthink.com/

Version

Server

cloudflare

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Google Trust Services

bigthink.com

Valid from

2026-08-08T13:03:43-05:00

Valid until

2026-11-06T13:03:03-06:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

Security headers

8 active

—

HSTSNot detected

✓

Content Security PolicyImplemented

✓

X-Content-Type-OptionsImplemented

✓

X-Frame-OptionsImplemented

✓

Referrer PolicyImplemented

✓

Permissions PolicyImplemented

✓

Cross-Origin-Opener-PolicyImplemented

✓

Cross-Origin-Embedder-PolicyImplemented

✓

Cross-Origin-Resource-PolicyImplemented

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

104.20.29.239, 172.66.171.144

61,78 ms

Cloudflare

1.1.1.1

104.20.29.239, 172.66.171.144

44,38 ms

Quad9

9.9.9.9

104.20.29.239, 172.66.171.144

41,49 ms

OpenDNS

208.67.222.222

104.20.29.239, 172.66.171.144

51,52 ms

AdGuard

94.140.14.14

104.20.29.239, 172.66.171.144

75,40 ms

IP, geolocation and ASNAssociated network information

104.20.29.239

No data

success

country

region

city

asn

organization

isp

172.66.171.144

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

aspmx2.googlemail.com

Port 25: Closed/unreachable - 1.3 ms - 
Port 465: Closed/unreachable - 4017.8 ms - 
Port 587: Closed/unreachable - 4020 ms -

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