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62
Total
70
DNS
45
Email
65
Security
65
Network
60
Availability
Domainnxtbook.com
IPv42
IPv60
MX records5
StatusActive
Domain technical report

Digital Content Experience Platform | Nxtbook

nxtbook.com

Create engaging content for your brand or business using our responsive digital publishing platform. From eBooks to magazines and more. Schedule a Demo!

Generated: 2026-08-10T00:45:56-05:00 · Cached result

JSONCSVPDFVisit site
IPv42
IPv60
MX5
NS6

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

6 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).

!
SPF0 / 25 pts · Mail

SPF policy not found.

✓
DMARC25 / 25 pts · Mail

DMARC policy published.

!
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

210 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

!
HTTP security headers0 / 35 pts · Security

0 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: ec2-100-24-245-172.compute-1.amazonaws.com

✓
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)
100.24.245.172
32.199.243.4

AAAA

0 record(s)
—

Not configured

CNAME

0 record(s)
—

Not configured

MX

5 record(s)
10 aspmx.l.google.com.
30 aspmx3.googlemail.com.
20 alt1.aspmx.l.google.com.
20 alt2.aspmx.l.google.com.
30 aspmx2.googlemail.com.

TXT

4 record(s)
"google-site-verification=p-JN12VDKYWv2mmmd0kaDlZqV7JA2aoi26GrmhgW3Qw"
"google-site-verification=FWZEZlmaaTxbYnb7fpnL9TLZ9tTi0Q8n1csZB_LnJ2w"
"google-site-verification=wv0J2fI_TETDHPSgGoSCCzDGXX19bu7jIURWxNrmZIA"
"google-site-verification=N4tIB6rjZ96RfVqNEsm1FeSS49_hA2YOxsy6yQFuncI"

NS

6 record(s)
ns61.constellix.net.
ns41.constellix.net.
ns51.constellix.net.
ns31.constellix.com.
ns21.constellix.com.
ns11.constellix.com.

SOA

1 record(s)
ns11.constellix.com. dns.constellix.com. 2015010219 43200 3600 1209600 180

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

Not configured
—

Not configured

DMARC

Configured
v=DMARC1;p=none;

DKIM

Not found
—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Digital Content Experience Platform | Nxtbook
Description
Create engaging content for your brand or business using our responsive digital publishing platform. From eBooks to magazines and more. Schedule a Demo!
Final URL
https://www.nxtbookmedia.com/
HTTP status
206

HTTP

Status
HTTP/2 403
Final URL
https://nxtbook.com/
Version
3
Server
awselb/2.0
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Amazon
CN
nxtbook.com
Valid from
2026-02-06T18:00:00-06:00
Valid until
2027-03-08T17:59:59-06:00
Days remaining
210
Protocol
TLSv1.3
Cipher
TLS_AES_128_GCM_SHA256

Security headers

0 active
—
HSTSNot detected
—
Content Security PolicyNot detected
—
X-Content-Type-OptionsNot detected
—
X-Frame-OptionsNot detected
—
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
100.24.245.172, 32.199.243.4
72,73 ms
Cloudflare
1.1.1.1
100.24.245.172, 32.199.243.4
45,75 ms
Quad9
9.9.9.9
100.24.245.172, 32.199.243.4
50,17 ms
OpenDNS
208.67.222.222
100.24.245.172, 32.199.243.4
70,33 ms
AdGuard
94.140.14.14
100.24.245.172, 32.199.243.4
67,40 ms

IP, geolocation and ASNAssociated network information

100.24.245.172

No data
success
No
country
region
city
asn
organization
isp

32.199.243.4

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

aspmx.l.google.com

Port 25: Closed/unreachable - 0.9 ms - 
Port 465: Closed/unreachable - 4020.7 ms - 
Port 587: Closed/unreachable - 4021 ms -

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