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88
Total
80
DNS
100
Email
84
Security
70
Network
100
Availability
Domainalison.com
IPv42
IPv62
MX records5
StatusActive
Domain technical report

Free Online Courses & Online Learning | Alison

alison.com

Free online courses with certificates. Join 15 million graduates and empower your career. Study, learn, certify, upskill with free online learning and training

Generated: 2026-08-10T02:51:02-05:00 · 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 policy0 / 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-STS5 / 5 pts · Mail

Mail transport policy.

✓
TLS-RPT5 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

238 day(s) remaining.

✓
Certificate lifetime10 / 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

2 record(s)
104.18.16.28
104.18.17.28

AAAA

2 record(s)
2606:4700::6812:101c
2606:4700::6812:111c

CNAME

0 record(s)
—

Not configured

MX

5 record(s)
5 alt2.aspmx.l.google.com.
10 alt3.aspmx.l.google.com.
5 alt1.aspmx.l.google.com.
10 alt4.aspmx.l.google.com.
1 aspmx.l.google.com.

TXT

10 record(s)
"google-site-verification=evDuEPbEnxCSvUQgEFn-EwVbbiLj970oyZM6Wo7JPm4"
"v=spf1 include:_spf.google.com include:one.zoho.com ip4:3.208.157.156/32 ip4:52.44.16.140/32 ip4:50.19.196.167/32 ip4:3.216.97.65/32 ip4:52.4.199.233/32 ip4:34.201.207.162/32 ip4:34.198.87.239/32 -all"
"google-site-verification=QurDq8xAKPrjqKDLcryTiQbA9k4Enu_kgXPm7a8HF-k"
"google-site-verification=WCqYby8KgNjS7nB-tsJ8TyxUQq89NiyyhsuSbDWEbJk"
"google-site-verification=IQOE8Nb89vheBE0ZUvRuvlV4AbBQI6N3zDWs5W-rjcQ"
"google-site-verification=FscGg9Go57I40Utb4x9cSoJ7Vwx3KO1VE2CbVD2M8l0"
"google-site-verification=N_n52U5wUjsAXELhKwMLVN1EtLs351OwfRx8ftdYGmQ"
"yahoo-verification-key=m+VtC0V62u7UCn4MziCAFQxhCVuC8fQzv+qRrAIgi7U="
"google-site-verification=A7Huw5jviMv61FexCkTIaw6gQXVACYaWBa0BLC1cUl0"
"google-site-verification=7CRHGaLUTgQmjypBIuIoXZBPNoT7bexijFNu4nACQps"

NS

2 record(s)
karl.ns.cloudflare.com.
cortney.ns.cloudflare.com.

SOA

1 record(s)
cortney.ns.cloudflare.com. dns.cloudflare.com. 2410764330 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.google.com include:one.zoho.com ip4:3.208.157.156/32 ip4:52.44.16.140/32 ip4:50.19.196.167/32 ip4:3.216.97.65/32 ip4:52.4.199.233/32 ip4:34.201.207.162/32 ip4:34.198.87.239/32 -all

DMARC

Configured
v=DMARC1;p=reject;rua=mailto:ae04b661@mxtoolbox.dmarc-report.com;ruf=mailto:ae04b661@forensics.dmarc-report.com;fo=1;pct=100

DKIM

Selector google
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCTe5Eym/IQDbM9cb3jjwzOWb9MY5fF4eDME6mv9dp+26JArSAo4LlItPTyCeydBqluJ1SCh824+737iJAxx917YQnDd3SH83ZnPYdKv+HKPCWWAo89YzqizGB6mQDGvzLesR9JJB5f0e2ZWoFwZMo0HNNCvAepIo+eyFWwLNsymQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Free Online Courses & Online Learning | Alison
Description
Free online courses with certificates. Join 15 million graduates and empower your career. Study, learn, certify, upskill with free online learning and training
Final URL
https://alison.com/
HTTP status
206

HTTP

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

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
GoDaddy.com, Inc.
CN
*.alison.com
Valid from
2026-03-04T04:35:00-06:00
Valid until
2027-04-05T05:35:00-05:00
Days remaining
238
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

5 active
✓
HSTSImplemented
✓
Content Security PolicyImplemented
✓
X-Content-Type-OptionsImplemented
✓
X-Frame-OptionsImplemented
—
Referrer PolicyNot detected
—
Permissions PolicyNot detected
✓
Cross-Origin-Opener-PolicyImplemented
—
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
104.18.16.28, 104.18.17.28
58,62 ms
Cloudflare
1.1.1.1
104.18.16.28, 104.18.17.28
43,54 ms
Quad9
9.9.9.9
104.18.16.28, 104.18.17.28
36,54 ms
OpenDNS
208.67.222.222
104.18.16.28, 104.18.17.28
87,75 ms
AdGuard
94.140.14.14
104.18.16.28, 104.18.17.28
68,11 ms

IP, geolocation and ASNAssociated network information

104.18.16.28

No data
success
No
country
region
city
asn
organization
isp

104.18.17.28

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

alt2.aspmx.l.google.com

Port 25: Closed/unreachable - 1.1 ms - 
Port 465: Closed/unreachable - 4021 ms - 
Port 587: Closed/unreachable - 4003.1 ms -

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