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70
Total
70
DNS
45
Email
73
Security
50
Network
100
Availability
Domainexplainthatstuff.com
IPv41
IPv60
MX records1
StatusActive
Domain technical report

Explain that Stuff

explainthatstuff.com

A collection of FREE, easy-to-understand science, technology, and how-it-works articles for the whole family!

Generated: 2026-08-11T06:16:59-05:00 · Cached result

JSONCSVPDFVisit site
IPv41
IPv60
MX1
NS2

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

!
IPv6 (AAAA)0 / 10 pts · Dns

0 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

1 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

46 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers8 / 35 pts · Security

2 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: cloud-144a2e.managed-vps.net

i
IPv4 diversity20 / 35 pts · Network

Two or more IPv4 addresses receive full points.

!
IPv6 connectivity0 / 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

1 record(s)
209.142.64.143

AAAA

0 record(s)
—

Not configured

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
10 mail.explainthatstuff.com.

TXT

2 record(s)
"e4ghpe2dvbg4gh9qa34kj3fg2l"
"v=spf1 +mx +a +ip4:209.142.64.143 ~all"

NS

2 record(s)
ns1.zen.co.uk.
ns0.zen.co.uk.

SOA

1 record(s)
ns0.zen.co.uk. netman.zen.co.uk. 2021072311 14400 1800 604800 3600

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 +mx +a +ip4:209.142.64.143 ~all

DMARC

Not configured
—

Not configured

DKIM

Not found
—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Explain that Stuff
Description
A collection of FREE, easy-to-understand science, technology, and how-it-works articles for the whole family!
Final URL
https://www.explainthatstuff.com/
HTTP status
206

HTTP

Status
HTTP/2 200
Final URL
https://www.explainthatstuff.com/
Version
3
Server
Apache
X-Powered-By
PHP/8.4.24

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Let's Encrypt
CN
explainthatstuff.com
Valid from
2026-06-28T17:27:33-05:00
Valid until
2026-09-26T17:27:32-05:00
Days remaining
46
Protocol
TLSv1.2
Cipher
ECDHE-RSA-AES128-GCM-SHA256

Security headers

2 active
✓
HSTSImplemented
—
Content Security PolicyNot detected
—
X-Content-Type-OptionsNot detected
✓
X-Frame-OptionsImplemented
—
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
209.142.64.143
176,19 ms
Cloudflare
1.1.1.1
209.142.64.143
231,72 ms
Quad9
9.9.9.9
209.142.64.143
140,05 ms
OpenDNS
208.67.222.222
209.142.64.143
163,57 ms
AdGuard
94.140.14.14
209.142.64.143
136,11 ms

IP, geolocation and ASNAssociated network information

209.142.64.143

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

mail.explainthatstuff.com

Port 25: Closed/unreachable - 100.1 ms - 
Port 465: Closed/unreachable - 23.8 ms - 
Port 587: Closed/unreachable - 116 ms - 220 cloud-144a2e.managed-vps.net ESMTP Exim 4.99.5 Tue, 11 Aug 2026 07:16:59 -0400

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