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Total

DNS

Email

Security

Network

100

Availability

Domainartofproblemsolving.com

IPv42

IPv62

MX records7

StatusActive

Domain technical report

Art of Problem Solving

artofproblemsolving.com

Online math classes, advanced math textbooks, math games, and more for high school and middle school students. Find out why our students win so many awards.

Generated: 2026-08-12T06:42:08-05:00 · Cached result

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IPv42

IPv62

MX7

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

7 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-STS0 / 5 pts · Mail

Mail transport policy.

TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

75 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers8 / 35 pts · Security

2 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)

104.20.40.144
172.66.172.26

AAAA

2 record(s)

2606:4700:10::6814:2890
2606:4700:10::ac42:ac1a

CNAME

0 record(s)

—

Not configured

MX

7 record(s)

10 aspmx.l.google.com.
31 aspmx3.googlemail.com.
30 aspmx2.googlemail.com.
33 aspmx5.googlemail.com.
32 aspmx4.googlemail.com.
21 alt2.aspmx.l.google.com.
20 alt1.aspmx.l.google.com.

TXT

13 record(s)

"google-site-verification=I8zBL4TTc5z8G78ZWfy5IuUJNjlBfD7Z33BBTud2lC0"
"google-site-verification=qBxHCMUZxmm1kfdjJ2yHH34G2r91c46wFYZ3hob6iFk"
"_gitlab-pages-verification-code.artofproblemsolving.com TXT gitlab-pages-verification-code=b231be07d1e131f5ad0867c8fa86f63c"
"google-site-verification=s9vftNg1k_VazUE_mei0G8x-hGKIo90grZdgIAJ5pCI"
"google-site-verification=bujm3xX2S_uWfnQr_CET-gMNg9846EwzaIBScrhQtpw"
"google-site-verification=MLvetiDDKdDoDwD0BJoNw1x3Z8KTJwrTzSlN3JaBjbA"
"zapier-domain-verification-challenge=d5e6e8f0-d79d-4586-af70-44fae04d9648"
"anthropic-domain-verification-xjeek4=cteCbqWFXpO2MIWjAhjqVL4Ql"
"cursor-domain-verification-mhhafy=eqGbMrcKXqX6djzB6zGipjj5u"
"facebook-domain-verification=zmmwg7oqqsqvf8ihckwvzoo85b08gx"
"google-site-verification=JzfJuPwZxIcZ9XcNNgcLKvARPDevzYL8bHI1JN3bE14"
"google-site-verification=N-v1SukFjS2tLUvMvwVmyQIHVR_nhItefzJFL6bjfxI"
"v=spf1 include:emsd1.com include:_spf.google.com include:sendgrid.net include:spf.tipalti.com ~all"

NS

2 record(s)

ray.ns.cloudflare.com.
emma.ns.cloudflare.com.

SOA

1 record(s)

emma.ns.cloudflare.com. dns.cloudflare.com. 2411625672 10000 2400 604800 1800

SPF

Configured

v=spf1 include:emsd1.com include:_spf.google.com include:sendgrid.net include:spf.tipalti.com ~all

DMARC

Configured

v=DMARC1; p=quarantine; rua=mailto:reports@artofproblemsolving.com; ruf=mailto:reports@artofproblemsolving.com; fo=1; adkim=r; aspf=r; rf=afrf; sp=quarantine

DKIM

Selector google

v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAr2o0keCB1lUt9JbBObrW2jmQZbRdhaOtuy/9NRZWyBg482Y0jcmnD2A+vx2SRpE++McWpVGpqlq66E/DmxFMEe3ZnrX0PoFNErhoBZjceRIGgD0IQlSfG/WZStfAYd5amA4oU0Mzyx4EHx3zuWGtDqeROZuJkJ/WgPJhoCLH5i/MNJYTDG+59zHnniA9/QnzBXPw7udcCVCSJ6dGVqipaoVPFQsw9T3qQ6CX7C1cAwEVZx4La2b9Gj+Fj2K8nHot8fXu3pGRNJKvV+17ZBFbRRb9XHy6g/tUgGiiB8M8YA8eh+bE5ksG7/8tc96FK5ZxXY/BZoksHpMDkT2DdircSwIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Art of Problem Solving

Description

Online math classes, advanced math textbooks, math games, and more for high school and middle school students. Find out why our students win so many awards.

Final URL

https://artofproblemsolving.com/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://artofproblemsolving.com/

Version

Server

cloudflare

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Google Trust Services

artofproblemsolving.com

Valid from

2026-07-28T13:32:00-05:00

Valid until

2026-10-26T14:31:52-05:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

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

104.20.40.144, 172.66.172.26

69,68 ms

Cloudflare

1.1.1.1

104.20.40.144, 172.66.172.26

39,51 ms

Quad9

9.9.9.9

104.20.40.144, 172.66.172.26

36,32 ms

OpenDNS

208.67.222.222

104.20.40.144, 172.66.172.26

75,25 ms

AdGuard

94.140.14.14

104.20.40.144, 172.66.172.26

48,97 ms

IP, geolocation and ASNAssociated network information

104.20.40.144

No data

success

country

region

city

asn

organization

isp

172.66.172.26

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.216.212

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

aspmx.l.google.com

Port 25: Closed/unreachable - 0.8 ms - 
Port 465: Closed/unreachable - 4020.7 ms - 
Port 587: Closed/unreachable - 4011.4 ms -

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