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88
Total
70
DNS
90
Email
88
Security
100
Network
100
Availability
Domainleanpub.com
IPv44
IPv68
MX records1
StatusActive
Domain technical report

Leanpub: Publish Early. Publish Often.

leanpub.com

Read ebooks and take online courses while the author is still writing them — and get every update free. Or write, publish, and sell your own in-progress book or course on Leanpub.

Generated: 2026-08-09T17:59:19-05:00 · Cached result

JSONCSVPDFVisit site
IPv44
IPv68
MX1
NS4

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

4 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

8 IPv6 address(es) detected.

✓
Name server redundancy20 / 20 pts · Dns

4 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 propagation0 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

1 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

162 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers23 / 35 pts · Security

6 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: server-3-170-51-66.cmh68.r.cloudfront.net

✓
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

4 record(s)
3.170.51.66
3.170.51.92
3.170.51.93
3.170.51.51

AAAA

8 record(s)
2600:9000:2798:f200:6:744:8980:93a1
2600:9000:2798:8e00:6:744:8980:93a1
2600:9000:2798:9000:6:744:8980:93a1
2600:9000:2798:2600:6:744:8980:93a1
2600:9000:2798:fc00:6:744:8980:93a1
2600:9000:2798:a200:6:744:8980:93a1
2600:9000:2798:f600:6:744:8980:93a1
2600:9000:2798:f000:6:744:8980:93a1

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
0 aspmx.l.google.com.

TXT

2 record(s)
"google-site-verification=zoRXbAIm861EKd5VTW9pSjE9SmF0G12EWQit--QX-RI"
"v=spf1 a mx include:spf.mtasv.net include:spf.mail.intercom.io include:servers.mcsv.net include:_spf.google.com -all"

NS

4 record(s)
ns-576.awsdns-08.net.
ns-1693.awsdns-19.co.uk.
ns-389.awsdns-48.com.
ns-1390.awsdns-45.org.

SOA

1 record(s)
ns-576.awsdns-08.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

CAA

0 record(s)
—

Not configured

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:spf.mtasv.net include:spf.mail.intercom.io include:servers.mcsv.net include:_spf.google.com -all

DMARC

Configured
v=DMARC1; p=none; pct=100; rua=mailto:re+yy4bkel2e8n@dmarc.postmarkapp.com; sp=none; aspf=r;

DKIM

Selector k1
k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbNrX2cY/GUKIFx2G/1I00ftdAj713WP9AQ1xir85i89sA2guU0ta4UX1Xzm06XIU6iBP41VwmPwBGRNofhBVR+e6WHUoNyIR4Bn84LVcfZE20rmDeXQblIupNWBqLXM1Q+VieI/eZu/7k9/vOkLSaQQdml4Cv8lb3PcnluMVIhQIDAQAB;

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Leanpub: Publish Early. Publish Often.
Description
Read ebooks and take online courses while the author is still writing them — and get every update free. Or write, publish, and sell your own in-progress book or course on Leanpub.
Final URL
https://leanpub.com/
HTTP status
200

HTTP

Status
HTTP/2 200
Final URL
https://leanpub.com/
Version
3
Server
CloudFront
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Amazon
CN
leanpub.com
Valid from
2025-12-19T18:00:00-06:00
Valid until
2027-01-18T17:59:59-06:00
Days remaining
162
Protocol
TLSv1.3
Cipher
TLS_AES_128_GCM_SHA256

Security headers

6 active
✓
HSTSImplemented
✓
Content Security PolicyImplemented
✓
X-Content-Type-OptionsImplemented
✓
X-Frame-OptionsImplemented
✓
Referrer PolicyImplemented
✓
Permissions PolicyImplemented
—
Cross-Origin-Opener-PolicyNot detected
—
Cross-Origin-Embedder-PolicyNot detected
—
Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Review
!
Differences detected

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
52.85.12.38, 52.85.12.42, 52.85.12.5, 52.85.12.76
74,58 ms
Cloudflare
1.1.1.1
52.85.12.38, 52.85.12.42, 52.85.12.5, 52.85.12.76
59,50 ms
Quad9
9.9.9.9
13.225.61.20, 13.225.61.38, 13.225.61.90, 13.225.61.92
69,37 ms
OpenDNS
208.67.222.222
52.85.12.38, 52.85.12.42, 52.85.12.5, 52.85.12.76
103,16 ms
AdGuard
94.140.14.14
3.166.96.119, 3.166.96.41, 3.166.96.78, 3.166.96.91
123,71 ms

IP, geolocation and ASNAssociated network information

3.170.51.66

Identified
success
Yes
country
United States
country_code
US
region
Ohio
city
Columbus
latitude
39.9586885
longitude
-82.9986903
asn
16509
organization
Amazon.com, Inc.
isp
Amazon.com, Inc.
timezone
America/New_York

3.170.51.92

Identified
success
Yes
country
United States
country_code
US
region
Ohio
city
Columbus
latitude
39.9586885
longitude
-82.9986903
asn
16509
organization
Amazon.com, Inc.
isp
Amazon.com, Inc.
timezone
America/New_York

3.170.51.93

Identified
success
Yes
country
United States
country_code
US
region
Ohio
city
Columbus
latitude
39.9586885
longitude
-82.9986903
asn
16509
organization
Amazon.com, Inc.
isp
Amazon.com, Inc.
timezone
America/New_York

3.170.51.51

Identified
success
Yes
country
United States
country_code
US
region
Ohio
city
Columbus
latitude
39.9586885
longitude
-82.9986903
asn
16509
organization
Amazon.com, Inc.
isp
Amazon.com, Inc.
timezone
America/New_York

Visitor information

Visitor
ip
216.73.217.62
reverse
country
country_code
region
city
latitude
longitude
isp
organization
asn
timezone
browser
Other
os
Other
language
user_agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
is_bot
Yes
cloudflare
No

SMTPEmail port connectivity

aspmx.l.google.com

Port 25: Closed/unreachable - 21.9 ms - 220 mx.google.com ESMTP 586e51a60fabf-459f2049519si7125377fac.230 - gsmtp
Port 465: Closed/unreachable - 4010.9 ms - 
Port 587: Closed/unreachable - 4018.8 ms -

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