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66
Total
70
DNS
65
Email
77
Security
35
Network
60
Availability
Domaincliffsnotes.com
IPv42
IPv60
MX records5
StatusActive
Domain technical report

Attention Required! | Cloudflare

cliffsnotes.com

Generated: 2026-08-11T02:09:33-05:00 · Cached result

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IPv42
IPv60
MX5
NS2

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

2 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

5 MX record(s).

✓
SPF25 / 25 pts · Mail

SPF policy published.

!
DMARC0 / 25 pts · Mail

DMARC policy not found.

✓
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

64 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers12 / 35 pts · Security

3 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 connectivity0 / 35 pts · Network

AAAA availability.

✓
DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

!
HTTP response0 / 40 pts · Availability

HTTP/2 403

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

2 record(s)
172.64.148.137
104.18.39.119

AAAA

0 record(s)
—

Not configured

CNAME

0 record(s)
—

Not configured

MX

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

TXT

4 record(s)
"v=spf1 a mx include:_spf.google.com include:mail.zendesk.com include:amazonses.com redirect=cliffsnotes.com.hosted.spf-report.com include:helpscoutemail.com ~all"
"globalsign-domain-verification=28DB9FCEFBA2745B7F57EF614E9B8F17"
"globalsign-domain-verification=D151191065D1DFB61FF73EF164ECC37A"
"google-site-verification=iujjMUAxV_bg2LRj8PkpLpD8iSYrUDl8zEJUG91aks0"

NS

2 record(s)
liv.ns.cloudflare.com.
langston.ns.cloudflare.com.

SOA

1 record(s)
langston.ns.cloudflare.com. dns.cloudflare.com. 2409720110 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 a mx include:_spf.google.com include:mail.zendesk.com include:amazonses.com redirect=cliffsnotes.com.hosted.spf-report.com include:helpscoutemail.com ~all

DMARC

Not configured
—

Not configured

DKIM

Selector s1
k=rsa; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwA0qVx+/YzH+xhoXO1dZ9pLqhSIcmPbviyStb6IEZQIGBTDV915lOvvLkVySHwGa2huzuKaMhybL+ncFxV+j5fChYQUN4ePpS6AVDIq62EbJ5XT8s6ywMIC/oI5niqkIhq+BB7Vqs770s+BtafHuLNAd6wO9cRg8VOAHqditj+ZAutTv8LozGutWJl+bplgw/ZyKH2heKdu/YuSnyMsS6S1lTFclQX+khGHH50uwnY6iNwzSALV+NJMdgrdS2MjcZ6MPMPHd8w1w0UzL3b9dzYRZOoJUXCt5dAcJLpjkskQ3Ll513mQDAfHuXQTagx93VBzS8LIr5pVN0tWsirR1CQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Attention Required! | Cloudflare
Description
Final URL
https://www.cliffsnotes.com/
HTTP status
403

HTTP

Status
HTTP/2 403
Final URL
https://www.cliffsnotes.com/
Version
3
Server
cloudflare
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Google Trust Services
CN
cliffsnotes.com
Valid from
2026-07-16T14:39:58-05:00
Valid until
2026-10-14T15:39:40-05:00
Days remaining
64
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

3 active
✓
HSTSImplemented
—
Content Security PolicyNot detected
—
X-Content-Type-OptionsNot detected
✓
X-Frame-OptionsImplemented
✓
Referrer PolicyImplemented
—
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
104.18.39.119, 172.64.148.137
70,18 ms
Cloudflare
1.1.1.1
104.18.39.119, 172.64.148.137
26,48 ms
Quad9
9.9.9.9
104.18.39.119, 172.64.148.137
37,30 ms
OpenDNS
208.67.222.222
104.18.39.119, 172.64.148.137
68,28 ms
AdGuard
94.140.14.14
104.18.39.119, 172.64.148.137
90,54 ms

IP, geolocation and ASNAssociated network information

172.64.148.137

No data
success
No
country
region
city
asn
organization
isp

104.18.39.119

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

alt1.aspmx.l.google.com

Port 25: Closed/unreachable - 0.9 ms - 
Port 465: Closed/unreachable - 4021.3 ms - 
Port 587: Closed/unreachable - 4017.3 ms -

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