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76
Total
80
DNS
45
Email
80
Security
70
Network
100
Availability
Domainmarkdownguide.org
IPv44
IPv61
MX records2
StatusActive
Domain technical report

Markdown Guide

markdownguide.org

A free and open-source reference guide that explains how to use Markdown.

Generated: 2026-08-10T02:50:12-05:00 · Cached result

JSONCSVPDFVisit site
IPv44
IPv61
MX2
NS2

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

4 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

1 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

2 MX record(s).

✓
SPF25 / 25 pts · Mail

SPF policy published.

!
DMARC0 / 25 pts · Mail

DMARC policy not found.

!
DKIM0 / 20 pts · Mail

No tested DKIM selector responded.

!
MTA-STS0 / 5 pts · Mail

Mail transport policy.

!
TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

17 day(s) remaining.

i
Certificate lifetime6 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers19 / 35 pts · Security

5 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

4 record(s)
151.101.131.52
151.101.3.52
151.101.195.52
151.101.67.52

AAAA

1 record(s)
2a04:4e42:a::820

CNAME

0 record(s)
—

Not configured

MX

2 record(s)
10 in1-smtp.messagingengine.com.
20 in2-smtp.messagingengine.com.

TXT

3 record(s)
"google-site-verification=zbgz00_KoRD4wzQ58AE0MQL9rOKe9hmkQv8De5cIEe0"
"v=spf1 include:spf.messagingengine.com ~all"
"ahrefs-site-verification_f0f099004e96b064122135556e57af335563ef0864adf369a1458256ea863d2c"

NS

2 record(s)
phil.ns.cloudflare.com.
amy.ns.cloudflare.com.

SOA

1 record(s)
amy.ns.cloudflare.com. dns.cloudflare.com. 2411152640 10000 2400 604800 1800

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 include:spf.messagingengine.com ~all

DMARC

Not configured
—

Not configured

DKIM

Not found
—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Markdown Guide
Description
A free and open-source reference guide that explains how to use Markdown.
Final URL
https://www.markdownguide.org/
HTTP status
206

HTTP

Status
HTTP/2 200
Final URL
https://www.markdownguide.org/
Version
3
Server
nginx/1.18.0 (Ubuntu)
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Certainly
CN
www.markdownguide.org
Valid from
2026-07-28T07:52:59-05:00
Valid until
2026-08-27T07:52:58-05:00
Days remaining
17
Protocol
TLSv1.3
Cipher
TLS_AES_128_GCM_SHA256

Security headers

5 active
✓
HSTSImplemented
—
Content Security PolicyNot detected
✓
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

Consistent
✓
Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
151.101.131.52, 151.101.195.52, 151.101.3.52, 151.101.67.52
80,65 ms
Cloudflare
1.1.1.1
151.101.131.52, 151.101.195.52, 151.101.3.52, 151.101.67.52
64,87 ms
Quad9
9.9.9.9
151.101.131.52, 151.101.195.52, 151.101.3.52, 151.101.67.52
55,10 ms
OpenDNS
208.67.222.222
151.101.131.52, 151.101.195.52, 151.101.3.52, 151.101.67.52
71,70 ms
AdGuard
94.140.14.14
151.101.131.52, 151.101.195.52, 151.101.3.52, 151.101.67.52
399,68 ms

IP, geolocation and ASNAssociated network information

151.101.131.52

No data
success
No
country
region
city
asn
organization
isp

151.101.3.52

No data
success
No
country
region
city
asn
organization
isp

151.101.195.52

No data
success
No
country
region
city
asn
organization
isp

151.101.67.52

No data
success
No
country
region
city
asn
organization
isp

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

in1-smtp.messagingengine.com

Port 25: Closed/unreachable - 1.2 ms - 
Port 465: Closed/unreachable - 4001.6 ms - 
Port 587: Closed/unreachable - 4024.1 ms -

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