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Total

DNS

Email

Security

Network

100

Availability

Domaincalnewport.com

IPv42

IPv62

MX records6

StatusActive

Domain technical report

Author of Deep Work, Study Hacks Blog - Cal Newport

calnewport.com

Official website of Georgetown Professor Cal Newport, author of the Study Hacks blog, Deep Work, and other New York Times bestselling books.

Generated: 2026-08-10T20:58:24-05:00 · Cached result

JSON CSV PDF Visit site

IPv42

IPv62

MX6

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 policy0 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

6 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

33 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers0 / 35 pts · Security

0 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 response40 / 40 pts · Availability

HTTP/2 200

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

2 record(s)

104.16.150.108
104.16.151.108

AAAA

2 record(s)

2606:4700::6810:966c
2606:4700::6810:976c

CNAME

0 record(s)

—

Not configured

MX

6 record(s)

25 mail.calnewport.com.
5 alt1.aspmx.l.google.com.
1 aspmx.l.google.com.
10 alt4.aspmx.l.google.com.
5 alt2.aspmx.l.google.com.
10 alt3.aspmx.l.google.com.

TXT

5 record(s)

"brevo-code:9251c9750b5fc4e560aaa4c17e119b00"
"google-site-verification=SxfqWvWkXfHhhYn85uKZVVmH5tL56FpiG8D5u5t_pvY"
"v=spf1 a mx include:spf.brevo.com include:sendgrid.net include:_spf.google.com ~all"
"google-site-verification=GWkoy4pXvJtfgphArFj46WCy8vygWfcjUjFZ8fPNND8"
"google-site-verification=KQZ3oyEKUKBcgosmEB1SMHYcdV9pu2ljlK-Ma0gdGKI"

NS

2 record(s)

reza.ns.cloudflare.com.
theo.ns.cloudflare.com.

SOA

1 record(s)

reza.ns.cloudflare.com. dns.cloudflare.com. 2409925122 10000 2400 604800 1800

SPF

Configured

v=spf1 a mx include:spf.brevo.com include:sendgrid.net include:_spf.google.com ~all

DMARC

Configured

v=DMARC1; p=quarantine;

DKIM

Selector google

v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAl+W86RQgvjQvNUQtKw3aPsvccYqTMz1n0cSZOlNaRNjpzjQPgpWezEDRqbH7Tf6KiO/xtejzqB6owDVJHyeey0KawEbDSDaKur3WKaIb7CcAkeMVdZ5o+H4TJ9LqZXQbuVTcevqfSyoruNJb4rD8TFoK1zSzwdca8aTEfjI2f9CAMW9ZmetwG8XntHv2Fump4YFOy6bYGf5gpa31BZDowjBEUkBF0h7rHc7rEGxCvFh5NjNXtWa4mC/zoAJBPSq5g+0YfNRtWkfHBh50pMgZw7vN6b6NCbIZIQx7oFJJ8QtcbbJ2F6EhPUnvlbL0fJ6Hl9ha1iXpcDEf99KTY5rNXwIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Author of Deep Work, Study Hacks Blog - Cal Newport

Description

Official website of Georgetown Professor Cal Newport, author of the Study Hacks blog, Deep Work, and other New York Times bestselling books.

Final URL

https://calnewport.com/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://calnewport.com/

Version

Server

cloudflare

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Google Trust Services

calnewport.com

Valid from

2026-06-15T09:13:31-05:00

Valid until

2026-09-13T10:13:21-05:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

Security headers

0 active

—

HSTSNot detected

—

Content Security PolicyNot detected

—

X-Content-Type-OptionsNot detected

—

X-Frame-OptionsNot detected

—

Referrer PolicyNot detected

—

Permissions PolicyNot detected

—

Cross-Origin-Opener-PolicyNot detected

—

Cross-Origin-Embedder-PolicyNot detected

—

Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

104.16.150.108, 104.16.151.108

57,63 ms

Cloudflare

1.1.1.1

104.16.150.108, 104.16.151.108

52,58 ms

Quad9

9.9.9.9

104.16.150.108, 104.16.151.108

56,22 ms

OpenDNS

208.67.222.222

104.16.150.108, 104.16.151.108

115,86 ms

AdGuard

94.140.14.14

104.16.150.108, 104.16.151.108

78,42 ms

IP, geolocation and ASNAssociated network information

104.16.150.108

No data

success

country

region

city

asn

organization

isp

104.16.151.108

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

mail.calnewport.com

Port 25: Closed/unreachable - 8 ms - 
Port 465: Closed/unreachable - 7.3 ms - 
Port 587: Closed/unreachable - 1.2 ms -

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