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Total

DNS

Email

100

Security

100

Network

100

Availability

Domaintaxfoundation.org

IPv44

IPv68

MX records1

StatusActive

Domain technical report

Tax Foundation | Principled, Insightful, Engaged

taxfoundation.org

Tax Foundation is the world's leading independent tax policy nonprofit. We lead the tax reform debate toward smarter simpler policy.

Generated: 2026-08-09T03:56:19-05:00 · Cached result

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IPv44

IPv68

MX1

NS4

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

4 IPv4 address(es) detected.

✓

IPv6 (AAAA)10 / 10 pts · Dns

8 IPv6 address(es) detected.

✓

Name server redundancy20 / 20 pts · Dns

4 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 propagation0 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

1 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

159 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

✓

HTTP security headers35 / 35 pts · Security

9 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: server-3-166-96-110.mci50.r.cloudfront.net

✓

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

4 record(s)

3.166.96.110
3.166.96.108
3.166.96.5
3.166.96.11

AAAA

8 record(s)

2600:9000:2798:7400:1c:cc62:e780:93a1
2600:9000:2798:9800:1c:cc62:e780:93a1
2600:9000:2798:3200:1c:cc62:e780:93a1
2600:9000:2798:5800:1c:cc62:e780:93a1
2600:9000:2798:c800:1c:cc62:e780:93a1
2600:9000:2798:0:1c:cc62:e780:93a1
2600:9000:2798:a400:1c:cc62:e780:93a1
2600:9000:2798:5600:1c:cc62:e780:93a1

CNAME

0 record(s)

—

Not configured

MX

1 record(s)

0 taxfoundation-org.mail.protection.outlook.com.

TXT

9 record(s)

"include:spf-us.emailsignatures365.com"
"v=spf1 a mx ptr include:spf.protection.outlook.com include:spf.dynect.net include:servers.mcsv.net include:20785128.spf02.hubspotemail.net include:_spf.salesforce.com -all"
"267C363244"
"atlassian-domain-verification=ykDElOfDhkD0ZZ+GGs7eC8ZoaZitugLS9Qzo8MI6hG6UJ/v5KRGNnxGP1GErXxzW"
"google-site-verification=bN-7qDjNP_IqgiV4HXKgX5rNze_vXtger_0tG4y-k3c"
"MS=ms36814630"
"apple-domain-verification=mPbx7o8ujRHkicTi"
"00dj0000001rzlyea2"
"canva-site-verification=8AznUPvo56Es8O6TY8JF2w"

NS

4 record(s)

ns-1800.awsdns-33.co.uk.
ns-139.awsdns-17.com.
ns-1011.awsdns-62.net.
ns-1235.awsdns-26.org.

SOA

1 record(s)

ns-1235.awsdns-26.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

SPF

Configured

v=spf1 a mx ptr include:spf.protection.outlook.com include:spf.dynect.net include:servers.mcsv.net include:20785128.spf02.hubspotemail.net include:_spf.salesforce.com -all

DMARC

Configured

v=DMARC1; p=quarantine; pct=100; rua=mailto:dmarc@taxfoundation.org; ruf=mailto:dmarc-failure@taxfoundation.org;

DKIM

Selector selector2

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCvz49ahlwi1MHAoZxHJgH8h7o5lp+n/b+jc83HNvRDCmeEInC8QzSoPr0mCP3uXqjoJMDbuS9+7Qlc3TtOlbiwLyFaY1tOgdsKomedTSMzZ7U/u2gjlD4JljK/1UxJ3Rb0RACJLXHn9Ad5paO4fXBPg1aAteG0jLXywy5gt6T8FQIDAQAB;

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Tax Foundation | Principled, Insightful, Engaged

Description

Tax Foundation is the world's leading independent tax policy nonprofit. We lead the tax reform debate toward smarter simpler policy.

Final URL

https://taxfoundation.org/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://taxfoundation.org/

Version

Server

nginx

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Amazon

taxfoundation.org

Valid from

2026-07-01T19:00:00-05:00

Valid until

2027-01-15T17:59:59-06:00

Days remaining

159

Protocol

TLSv1.3

Cipher

TLS_AES_128_GCM_SHA256

Security headers

9 active

✓

HSTSImplemented

✓

Content Security PolicyImplemented

✓

X-Content-Type-OptionsImplemented

✓

X-Frame-OptionsImplemented

✓

Referrer PolicyImplemented

✓

Permissions PolicyImplemented

✓

Cross-Origin-Opener-PolicyImplemented

✓

Cross-Origin-Embedder-PolicyImplemented

✓

Cross-Origin-Resource-PolicyImplemented

DNS propagationComparison across public resolvers

Public resolver comparison

Review

Differences detected

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

3.170.103.12, 3.170.103.45, 3.170.103.49, 3.170.103.99

51,32 ms

Cloudflare

1.1.1.1

3.170.103.12, 3.170.103.45, 3.170.103.49, 3.170.103.99

76,64 ms

Quad9

9.9.9.9

3.166.96.108, 3.166.96.11, 3.166.96.110, 3.166.96.5

150,69 ms

OpenDNS

Visitor

216.73.217.62

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

taxfoundation-org.mail.protection.outlook.com

Port 25: Closed/unreachable - 18.2 ms - 
Port 465: Closed/unreachable - 4047.5 ms - 
Port 587: Closed/unreachable - 4056.8 ms -

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